Pub Date : 2022-07-28DOI: 10.20998/2079-0821.2020.02.01
Mariya Zinchenko, Evgenija Ponomarenko, Nataliia Bukatenko, Olga Holubkina
Water usage of sugar beet factories is characterized by a high level of consumption and a large volume of generated wastewater with a high concentration of mineral and organic pollution. Artificial biological purification facilities are mainly used for purification of sugar production effluents. While a scheme with two-stage aeration tanks is the most widespread in our country,anaerobic-aerobic regimens are frequently used abroad. It is more cost-effective, since the oxidation of large amounts of organic substances exclusively under aerobic conditions is associated with high energy consumption. The use of anaerobic digestion at the first stage allows reducing the concentration of organic substances in effluents by 60-90%, while the post-purification of remaining contaminants is carried out in stage-two aeration tanks with lower energy consumption. To assess the appropriateness of using a digester in the system of purification facilities of a particular enterprise, it is necessary to have information on the effectiveness of digestion and the optimal purification regime of the wastewater of that particular enterprise. This work studies the process of anaerobic digestion of wastewater at one of the beet sugar factories in Ukraine. The experiments were carried out in a bioreactor with an upward flow of activated sludge. The method of mathematical planning of an experiment was used in order to shorten the duration of the research. As a result, data was obtained regarding the influence of determining factors (flow rate, pH, temperature) on biogas yield and substrate fermentation depth. Received data proves the effectiveness and prospects of using anaerobic digestion in the first stage of biological fermentation of wastewater at a sugar beet production.
{"title":"ANAEROBIC BIOLOGICAL WASTEWATER TREATMENT OF SUGAR PRODUCTION","authors":"Mariya Zinchenko, Evgenija Ponomarenko, Nataliia Bukatenko, Olga Holubkina","doi":"10.20998/2079-0821.2020.02.01","DOIUrl":"https://doi.org/10.20998/2079-0821.2020.02.01","url":null,"abstract":"Water usage of sugar beet factories is characterized by a high level of consumption and a large volume of generated wastewater with a high concentration of mineral and organic pollution. Artificial biological purification facilities are mainly used for purification of sugar production effluents. While a scheme with two-stage aeration tanks is the most widespread in our country,anaerobic-aerobic regimens are frequently used abroad. It is more cost-effective, since the oxidation of large amounts of organic substances exclusively under aerobic conditions is associated with high energy consumption. The use of anaerobic digestion at the first stage allows reducing the concentration of organic substances in effluents by 60-90%, while the post-purification of remaining contaminants is carried out in stage-two aeration tanks with lower energy consumption. To assess the appropriateness of using a digester in the system of purification facilities of a particular enterprise, it is necessary to have information on the effectiveness of digestion and the optimal purification regime of the wastewater of that particular enterprise. This work studies the process of anaerobic digestion of wastewater at one of the beet sugar factories in Ukraine. The experiments were carried out in a bioreactor with an upward flow of activated sludge. The method of mathematical planning of an experiment was used in order to shorten the duration of the research. As a result, data was obtained regarding the influence of determining factors (flow rate, pH, temperature) on biogas yield and substrate fermentation depth. Received data proves the effectiveness and prospects of using anaerobic digestion in the first stage of biological fermentation of wastewater at a sugar beet production.","PeriodicalId":9407,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Chemistry, Chemical Technology and Ecology","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86253744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-28DOI: 10.20998/2079-0821.2020.02.06
Nataliia Oleksandrivna Rudenko, Boris Ivanovych Bairachniy
The paper presents the features of the synthesis of hydrogen released as a result of dissolution of the aluminum alloy AMg. To more fully determine the technological characteristics of hydrogen synthesis, we studied the volumes of hydrogen released in the reactor as a result of dissolution of the aluminum alloy AMg. The mechanism of alloy dissolution is established taking into account the effect of impurities in the alloy on the anodic dissolution process. The conditions for accelerating the anodic dissolution of the AMg alloy in the presence of chlorine ions under the conditions of the “negative differential effect” are determined. The dissolution of the AMg alloy in an alkaline chloride solution has an electrochemical nature, which is based on the electrochemical mechanism of hydrogen reduction with the subsequent process of its diffusion into the gas phase. Chloride ions accelerate the active dissolution of aluminum at current densities of 5 A/dm2 instead of 3 A/dm2 at room temperature and surface roughness of class 3-5 (≈5 μm). The greatest influence on the dissolution rate of the alloy has the concentration of NaOH, the dissolution temperature and the surface cleanliness class. The main technological indicator of the improvement of hydrogen electrosynthesis is the use of anodic depolarization of aluminum, its negative values and, as a consequence, the evolution of hydrogen on both electrodes. The depolarization effect is achieved by dissolving the aluminum alloy instead of the oxygen evolution reaction at the anode. The voltage on the cell is 2 times lower compared to industrial alkaline water electrolysis. This makes it possible to save up to 50% of electricity. The absence of oxygen evolution makes this process safer.
{"title":"EFFICIENCY OF WATER-BASED ELECTROLYSIS DEPENDING ON TECHNOLOGICAL PARAMETERS OF CORROSIVE AND ANODE DISSOLUTION OF ALUMINUM","authors":"Nataliia Oleksandrivna Rudenko, Boris Ivanovych Bairachniy","doi":"10.20998/2079-0821.2020.02.06","DOIUrl":"https://doi.org/10.20998/2079-0821.2020.02.06","url":null,"abstract":"The paper presents the features of the synthesis of hydrogen released as a result of dissolution of the aluminum alloy AMg. To more fully determine the technological characteristics of hydrogen synthesis, we studied the volumes of hydrogen released in the reactor as a result of dissolution of the aluminum alloy AMg. The mechanism of alloy dissolution is established taking into account the effect of impurities in the alloy on the anodic dissolution process. The conditions for accelerating the anodic dissolution of the AMg alloy in the presence of chlorine ions under the conditions of the “negative differential effect” are determined. The dissolution of the AMg alloy in an alkaline chloride solution has an electrochemical nature, which is based on the electrochemical mechanism of hydrogen reduction with the subsequent process of its diffusion into the gas phase. Chloride ions accelerate the active dissolution of aluminum at current densities of 5 A/dm2 instead of 3 A/dm2 at room temperature and surface roughness of class 3-5 (≈5 μm). The greatest influence on the dissolution rate of the alloy has the concentration of NaOH, the dissolution temperature and the surface cleanliness class. The main technological indicator of the improvement of hydrogen electrosynthesis is the use of anodic depolarization of aluminum, its negative values and, as a consequence, the evolution of hydrogen on both electrodes. The depolarization effect is achieved by dissolving the aluminum alloy instead of the oxygen evolution reaction at the anode. The voltage on the cell is 2 times lower compared to industrial alkaline water electrolysis. This makes it possible to save up to 50% of electricity. The absence of oxygen evolution makes this process safer.","PeriodicalId":9407,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Chemistry, Chemical Technology and Ecology","volume":"144 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91461317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-28DOI: 10.20998/2079-0821.2020.02.08
Sergey Mikhailovich Logvinkov, Oksana Nikolaevna Borisenko, Nataliіa Sergeevna Tsapko, Galina Nikolaevna Shabanova, Alla Nikolaevna Korohodska, Vita Nikolaevna Shumejko, Olena Gaponova
The study of state diagrams of multicomponent physicochemical systems is the most science-intensive task of materials science. Without knowledge about the structure of the state diagrams of such systems, it is impossible for technologists to predict the phase composition of materials during their production and use of products from them; the systematic analysis of the results of experimental studies to optimize the properties of the materials being developed becomes much more complicated. In refractory technology, the defining stage of production is solid-phase sintering, which makes the information on the subsolidus structure of state diagrams of physicochemical systems represented by a set of components in accordance with the planned phase composition of materials particularly important. Three-component systems, the simple components of which are refractory oxides, constitute the physicochemical basis of most mass-produced refractories and their subsolidus structure is quite clearly displayed in the concentration triangle of the system by a set of triangles, the vertices of which are the points of the composition of the compounds. The study is devoted to the establishment of an analytical relationship between the number of double and triple compounds and the number of all possible segments of connecting lines between the points of the composition of the connections, as well as the points of intersection of the compounds between themselves. During the research, the general principles of systems analysis, logical methods and terminology of physicochemical analysis of multicomponent systems, as well as information on elementary mathematics from the sections on numerical series, the basics of combinatorics and algebra were used. The corresponding analytical expressions make it possible to calculate the quantitative classification characteristics in the taxonomy of multicomponent systems by the degree of complexity of the structure of their subsolidus regions, in particular, when comparing the complexity of studies of three-component oxide systems and their typification. The formulas obtained were tested for calculations using examples of specific oxide systems. The research results allow one to obtain important quantitative characteristics for assessing the degree of complexity of the subsolidus structure of three-component systems.
{"title":"CALCULATED EVALUATION OF THE DEGREE OF SUBSOLIDUS STRUCTURE COMPLEXITY OF THE PHYSICO-CHEMICAL THREE-COMPONENT SYSTEMS","authors":"Sergey Mikhailovich Logvinkov, Oksana Nikolaevna Borisenko, Nataliіa Sergeevna Tsapko, Galina Nikolaevna Shabanova, Alla Nikolaevna Korohodska, Vita Nikolaevna Shumejko, Olena Gaponova","doi":"10.20998/2079-0821.2020.02.08","DOIUrl":"https://doi.org/10.20998/2079-0821.2020.02.08","url":null,"abstract":"The study of state diagrams of multicomponent physicochemical systems is the most science-intensive task of materials science. Without knowledge about the structure of the state diagrams of such systems, it is impossible for technologists to predict the phase composition of materials during their production and use of products from them; the systematic analysis of the results of experimental studies to optimize the properties of the materials being developed becomes much more complicated. In refractory technology, the defining stage of production is solid-phase sintering, which makes the information on the subsolidus structure of state diagrams of physicochemical systems represented by a set of components in accordance with the planned phase composition of materials particularly important. Three-component systems, the simple components of which are refractory oxides, constitute the physicochemical basis of most mass-produced refractories and their subsolidus structure is quite clearly displayed in the concentration triangle of the system by a set of triangles, the vertices of which are the points of the composition of the compounds. The study is devoted to the establishment of an analytical relationship between the number of double and triple compounds and the number of all possible segments of connecting lines between the points of the composition of the connections, as well as the points of intersection of the compounds between themselves. During the research, the general principles of systems analysis, logical methods and terminology of physicochemical analysis of multicomponent systems, as well as information on elementary mathematics from the sections on numerical series, the basics of combinatorics and algebra were used. The corresponding analytical expressions make it possible to calculate the quantitative classification characteristics in the taxonomy of multicomponent systems by the degree of complexity of the structure of their subsolidus regions, in particular, when comparing the complexity of studies of three-component oxide systems and their typification. The formulas obtained were tested for calculations using examples of specific oxide systems. The research results allow one to obtain important quantitative characteristics for assessing the degree of complexity of the subsolidus structure of three-component systems.","PeriodicalId":9407,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Chemistry, Chemical Technology and Ecology","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80477782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The processes of plasma-electrolytic formation of heteroxide coatings on titanium alloys for the photocatalytic disintegration of natural and technogenic toxicants are studied. Synthesis of coatings was carried out from aqueous diphosphate solutions in the galvanostatic mode. For a quantitative description of photocatalytic reactions, reaction rate constants were calculated from the linearized dependences lnCt/C0, where Ct is the current concentration of the azodye and C0 is the initial concentration of the reactant. The surface morphology of the coatings was studied by atomic force microscopy and visualized the results by reconstructing the relief in the form of 2D and 3D topographic maps. The morphological features of titanium (IV) oxide coatings and heteroxide composites containing zinc and / or copper oxides are analyzed. It has been shown that the specific surface remains an effective factor in controlling the photocatalytic activity of coatings; therefore, the establishment of the morphology of heteroxide composites, as well as methods for controlling this parameter of the target product, is an invariable component of a systematic study of such materials when establishing their functional properties. It is established that, in comparison with titanium oxide coatings, whose surface layers are characterized by toroidal mesostructures, heteroxide compositions have a more developed surface, which positively affects their functional properties. Subsequent heat treatment also has the same effect on coating properties. The rate constants of the photocatalytic decomposition of the methyl orange azodye, determined under similar conditions, were used to rank coatings of various compositions according to their functional properties. Thus, for the reaction on the surface of titanium oxide, the rate constant is 1.56∙10–3 min–1, while for the heterooxide layer TiO2·ZnO it increases to 5.8∙10–3 min–1. The coating of TiO2·ZnO is the most catalytically active, although the TiO2·ZnO·CuO system also accelerates the decomposition process with a degree of degradation of 25% for 60 minutes, further, the efficiency of the catalyst decreases.
{"title":"METALOXIDE COMPOSITES FOR PHOTOCATALYTIC DISINTEGRATION OF TOXICANTS","authors":"Mykola Sakhnenko, Maryna Ved’, Natalia Markova, Irina Stepanova, Aleksandr Halak, Sergey Menshov, Aleksey Matykin","doi":"10.20998/2079-0821.2020.02.04","DOIUrl":"https://doi.org/10.20998/2079-0821.2020.02.04","url":null,"abstract":"The processes of plasma-electrolytic formation of heteroxide coatings on titanium alloys for the photocatalytic disintegration of natural and technogenic toxicants are studied. Synthesis of coatings was carried out from aqueous diphosphate solutions in the galvanostatic mode. For a quantitative description of photocatalytic reactions, reaction rate constants were calculated from the linearized dependences lnCt/C0, where Ct is the current concentration of the azodye and C0 is the initial concentration of the reactant. The surface morphology of the coatings was studied by atomic force microscopy and visualized the results by reconstructing the relief in the form of 2D and 3D topographic maps. The morphological features of titanium (IV) oxide coatings and heteroxide composites containing zinc and / or copper oxides are analyzed. It has been shown that the specific surface remains an effective factor in controlling the photocatalytic activity of coatings; therefore, the establishment of the morphology of heteroxide composites, as well as methods for controlling this parameter of the target product, is an invariable component of a systematic study of such materials when establishing their functional properties. It is established that, in comparison with titanium oxide coatings, whose surface layers are characterized by toroidal mesostructures, heteroxide compositions have a more developed surface, which positively affects their functional properties. Subsequent heat treatment also has the same effect on coating properties. The rate constants of the photocatalytic decomposition of the methyl orange azodye, determined under similar conditions, were used to rank coatings of various compositions according to their functional properties. Thus, for the reaction on the surface of titanium oxide, the rate constant is 1.56∙10–3 min–1, while for the heterooxide layer TiO2·ZnO it increases to 5.8∙10–3 min–1. The coating of TiO2·ZnO is the most catalytically active, although the TiO2·ZnO·CuO system also accelerates the decomposition process with a degree of degradation of 25% for 60 minutes, further, the efficiency of the catalyst decreases.","PeriodicalId":9407,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Chemistry, Chemical Technology and Ecology","volume":"02 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80075372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the complex of petrophysical methods for studying reservoir rocks, the semi-permeable membrane method whereby the residual water saturation and the structure of the pore space are mainly determined during the modeling of the process of produced water displacement by gas during the deposit formation, is quite widely used. In this case, the membrane operates in drainage mode. To address issues that arise during the oil and gas fields development, the reverse process is also of interest - modeling the reverse water flooding of the pore space when the gas pressure in the deposits decreases or during forced water flooding of the deposits, or when studying the processes of selective water flooding of wells. In this case, the membrane should work in the drainage mode for the first part of the experiment, creating residual water saturation, and.it should work in the impregnation mode fo rthe second part of theex periment. The drainage mode is described in sufficient detail in the literature, there are practically no materials on reverse impregnation. The carried out work was aimed at developing a semi-permeable membrane method for the drainage-impregnation regime to the extent of practical use, including carryingouta small number of test studies. The developed methodology will be explained in complete detail in the corresponding methodological manual, mainly its problematic aspects are considered here. Further application of the developed methodology will be aimed at solving specific problems arising in the process of hydrocarbon deposits development. Among the priority objects of study are the processes of gas displacement by oil from oil banks, oil displacement by water, oil and gas mixture displacement during the cycling process.
{"title":"SEMI–PERMEABLE MEMBRANE METHOD IN DRAINING-IMPREGNATION MODE IN THE INVESTIGATION OF OIL AND GAS COLLECTORS","authors":"Sergei Fedorovich Poverennyi, Illia Mykhaylovych Fyk, Olena Pavlovna Varavina, Olena Olexandrivna Yatskevych","doi":"10.20998/2079-0821.2020.02.11","DOIUrl":"https://doi.org/10.20998/2079-0821.2020.02.11","url":null,"abstract":"In the complex of petrophysical methods for studying reservoir rocks, the semi-permeable membrane method whereby the residual water saturation and the structure of the pore space are mainly determined during the modeling of the process of produced water displacement by gas during the deposit formation, is quite widely used. In this case, the membrane operates in drainage mode. To address issues that arise during the oil and gas fields development, the reverse process is also of interest - modeling the reverse water flooding of the pore space when the gas pressure in the deposits decreases or during forced water flooding of the deposits, or when studying the processes of selective water flooding of wells. In this case, the membrane should work in the drainage mode for the first part of the experiment, creating residual water saturation, and.it should work in the impregnation mode fo rthe second part of theex periment. The drainage mode is described in sufficient detail in the literature, there are practically no materials on reverse impregnation. The carried out work was aimed at developing a semi-permeable membrane method for the drainage-impregnation regime to the extent of practical use, including carryingouta small number of test studies. The developed methodology will be explained in complete detail in the corresponding methodological manual, mainly its problematic aspects are considered here. Further application of the developed methodology will be aimed at solving specific problems arising in the process of hydrocarbon deposits development. Among the priority objects of study are the processes of gas displacement by oil from oil banks, oil displacement by water, oil and gas mixture displacement during the cycling process.","PeriodicalId":9407,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Chemistry, Chemical Technology and Ecology","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75469190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A research of the corrosion effect on the metal (copper plate) of a broad fuel fraction (FPF) - a liquid product of thermal destruction of secondary raw materials made of low pressure polyethylene (LDPE) at temperatures up to 380 ° C and a pressure of 0,12-0,15 MPa. is conducted. Determination of the corrosion effect on the copper FFT plate was carried out in accordance with the standard ASTM D 130-10 at a temperature of 50 ° C for 120 minutes for both the dehydrated FFT sample and in the presence of 1% water. It was found that the copper plates, which were in the FFT and FFT + 1% water in the visual evaluation, had a light orange color, close to the color of the original plate. This, in turn, indicates that the investigated FFT samples have withstood the test, and the corrosive effect on the copper plate can be attributed to a slight fading, class 1.a. Also, together with the study under standard conditions, the corrosion effect on the copper plate of the products of combustion of FFT at different temperatures at which it was found that in the temperature range 180-230 ° C the surface of the copper plate becomes pale purple, and the corrosion effect on the copper plate can be attributed to moderate dimming, class 2.b; at temperatures of 230-290 ° the surface of the copper plate already has a silver color, and the corrosive effect on the copper plate corresponds to a moderate blackout, class 2.d. Therefore, when the combustion products of the FFT on the copper plate only oxygen corrosion occurs, which is due to the presence of oxygen in the area of the copper plate and the temperature of the combustion products. Thus, it was concluded that there is no corrosive elements in the FFT, which makes it suitable for use as a cheap component of motor, furnace and boiler fuels, improving their performance (e.g., reducing sulfur content).
研究了一种由低压聚乙烯(LDPE)制成的二次原料在380°C的温度和0.12 - 0.15 MPa的压力下热破坏的液体产品——广义燃料馏分(FPF)对金属(铜板)的腐蚀效果。进行。根据标准ASTM D 130-10，在50°C的温度下，在脱水FFT样品和1%的水存在下，对铜FFT板的腐蚀效果进行了测定。在目测评价中发现，在FFT和FFT + 1%水中的铜板呈浅橙色，接近原板的颜色。反过来，这表明所研究的FFT样品经受住了测试，对铜板的腐蚀作用可以归因于轻微的褪色，1.a类。并结合标准条件下对FFT燃烧产物在不同温度下对铜板的腐蚀作用进行了研究，发现在180 ~ 230℃温度范围内，铜板表面呈淡紫色，对铜板的腐蚀作用可归因于中度变暗，2.b类;在230-290°的温度下，铜板表面已经呈银色，对铜板的腐蚀作用相当于中度停电，2.d类。因此，当FFT的燃烧产物在铜板上只发生氧腐蚀时，这是由于在铜板区域存在氧和燃烧产物的温度。因此，得出的结论是，FFT中不含腐蚀性元素，这使得它适合用作电机、炉子和锅炉燃料的廉价成分，从而改善其性能(例如，降低硫含量)。
{"title":"INVESTIGATION OF CORROSIVE EFFECT ON METAL OF A BROAD FUEL FRACTION OBTAINED FROM SECONDARY POLYMER RAW MATERIAL","authors":"Andriy Borysovych Grigorov, Kyryl Volodymyrovych Shevchenko, Irina Valeriivna Sinkevich","doi":"10.20998/2079-0821.2020.02.10","DOIUrl":"https://doi.org/10.20998/2079-0821.2020.02.10","url":null,"abstract":"A research of the corrosion effect on the metal (copper plate) of a broad fuel fraction (FPF) - a liquid product of thermal destruction of secondary raw materials made of low pressure polyethylene (LDPE) at temperatures up to 380 ° C and a pressure of 0,12-0,15 MPa. is conducted. Determination of the corrosion effect on the copper FFT plate was carried out in accordance with the standard ASTM D 130-10 at a temperature of 50 ° C for 120 minutes for both the dehydrated FFT sample and in the presence of 1% water. It was found that the copper plates, which were in the FFT and FFT + 1% water in the visual evaluation, had a light orange color, close to the color of the original plate. This, in turn, indicates that the investigated FFT samples have withstood the test, and the corrosive effect on the copper plate can be attributed to a slight fading, class 1.a. Also, together with the study under standard conditions, the corrosion effect on the copper plate of the products of combustion of FFT at different temperatures at which it was found that in the temperature range 180-230 ° C the surface of the copper plate becomes pale purple, and the corrosion effect on the copper plate can be attributed to moderate dimming, class 2.b; at temperatures of 230-290 ° the surface of the copper plate already has a silver color, and the corrosive effect on the copper plate corresponds to a moderate blackout, class 2.d. Therefore, when the combustion products of the FFT on the copper plate only oxygen corrosion occurs, which is due to the presence of oxygen in the area of the copper plate and the temperature of the combustion products. Thus, it was concluded that there is no corrosive elements in the FFT, which makes it suitable for use as a cheap component of motor, furnace and boiler fuels, improving their performance (e.g., reducing sulfur content).","PeriodicalId":9407,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Chemistry, Chemical Technology and Ecology","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81343987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The studies carried out concern the development of structural radiotransparent ceramic materials based on the four-component system BaO–SrO–Al2O3–SiO2. Due to the widespread use of radar equipment at modern aviation facilities, the development of radiotransparent fairings for them is a rather important and urgent task.The purpose of the fairings is to protect the antenna devices of radar stations from environmental influences during flight. Based on this, the fairings must meet a complex set of requirements for aerodynamic, thermal, radio engineering and mechanical properties. These requirements at supersonic flight speeds of modern objects increase significantly, since the improvement of the aerodynamic shape, the increase in the mechanical strength and thermal stability of the fairings contradicts the interests of radio engineering, leading to a significant deterioration in their radiotransparency and to distortions of antenna directional patterns. The consequence is a decrease in the range of radar stations and serious deterioration in their accuracy characteristics.The aim of the research was to obtain, on the basis of the BaO–SrO–Al2O3–SiO2 system, crystalline phases of slavsonit and celsian at low temperatures and times of synthesis, by introducing sintering intensifiers with fluxing and modifying action.The influence of a number of additives on the intensification of the low-temperature synthesis of slavsonit and celsian is investigated. The positive effect of the eutectic additive of the SnO2–Li2O system on the preparation of a densely sintered ceramic material based on solid solutions of slavsonit and monoclinic celsian is shown. It has been established that, according to its dielectric properties, the obtained ceramic material can be classified as structural radio-transparent materials.
{"title":"STUDY OF THE INFLUENCE OF INTENSIFYING ADDITIVES ON LOW-TEMPERATURE SYNTHESIS OF SLAVSONITE AND CELZIAN IN THE CREATION OF RADIOTRANSPARENT CERAMIC MATERIALS","authors":"Georgiy Lisachuk, Ruslan Kryvobok, Artem Zakharov, Valentyna Voloshchuk, Lidiia Lisachuk, Yevhen Chefranov","doi":"10.20998/2079-0821.2020.02.09","DOIUrl":"https://doi.org/10.20998/2079-0821.2020.02.09","url":null,"abstract":"The studies carried out concern the development of structural radiotransparent ceramic materials based on the four-component system BaO–SrO–Al2O3–SiO2. Due to the widespread use of radar equipment at modern aviation facilities, the development of radiotransparent fairings for them is a rather important and urgent task.The purpose of the fairings is to protect the antenna devices of radar stations from environmental influences during flight. Based on this, the fairings must meet a complex set of requirements for aerodynamic, thermal, radio engineering and mechanical properties. These requirements at supersonic flight speeds of modern objects increase significantly, since the improvement of the aerodynamic shape, the increase in the mechanical strength and thermal stability of the fairings contradicts the interests of radio engineering, leading to a significant deterioration in their radiotransparency and to distortions of antenna directional patterns. The consequence is a decrease in the range of radar stations and serious deterioration in their accuracy characteristics.The aim of the research was to obtain, on the basis of the BaO–SrO–Al2O3–SiO2 system, crystalline phases of slavsonit and celsian at low temperatures and times of synthesis, by introducing sintering intensifiers with fluxing and modifying action.The influence of a number of additives on the intensification of the low-temperature synthesis of slavsonit and celsian is investigated. The positive effect of the eutectic additive of the SnO2–Li2O system on the preparation of a densely sintered ceramic material based on solid solutions of slavsonit and monoclinic celsian is shown. It has been established that, according to its dielectric properties, the obtained ceramic material can be classified as structural radio-transparent materials.","PeriodicalId":9407,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Chemistry, Chemical Technology and Ecology","volume":"1111 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76764958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-07-28DOI: 10.20998/2079-0821.2020.02.02
Katerina Rutkovska, Hennadii Tulskyi, Valerii Homozov, Alexandr Rusinov
A gas diffusion electrode was used to implement depolarization of the cathodic process with atmospheric oxygen to improve the production of sodium hypochlorite by electrolysis of an aqueous solution of sodium chloride. As materials for the implementation of depolarization of the cathode process on a porous cathode from the grid, we selected: manganese oxides, cobalt oxides, ruthenium oxides. These oxides are characterized by low overvoltage of the oxygen reaction. Oxides of selected metals were applied to a mesh current lead by thermal decomposition of coating solutionsю. The gas diffusion electrode consisted of a lined titanium current lead, a dispersant of gas made of porous graphite, and an external mesh working element, on which cathodic reactions occurred. The preparation of a catalytically active layer of oxide-metal coatings was carried out by thermal decomposition of coating solutions. This method fully complies with the requirements for oxide-metal electrodes for the electrolysis of aqueous solutions of sodium chloride: the ability to control the composition of the composite coating in a wide range of component concentrations. On the current-voltage cyclic dependences of the cathodic process, for all the materials studied, certain areas of oxygen reduction and combined oxygen reduction and hydrogen evolution are observed. The first section of oxygen reduction is observed to the equilibrium potentials of the hydrogen reaction (approximately –0.42 V). The oxygen reduction rate is small and amounts to 3...5 mA/cm2. There is no difference in the current-voltage dependence due to the high potential sweep speed, which does not lead to oxygen depletion in the case of cathode operation without air supply. In the second section (at potentials, more negative equilibrium potentials of the hydrogen reaction), a significant increase in the rate of the cathodic reaction due to hydrogen evolution is observed. Oxygen, in this case, is reduced at the limiting current density. In the third section (more than –1.5 V), the speed of the cathodic process is almost completely determined by the rate of hydrogen evolution. The effect of air supply to the gas diffusion cathode is observed when comparing the reverse stroke of cyclic current–voltage dependences. On the surface of the steel mesh, an increase in the reverse current is observed in the potential range –1.0 to 0 V. Which indicates an increase in adsorbed particles involved in the cathodic process. As shown earlier, this range of potentials corresponds to the 1st and 2nd sections of the obtained dependences in which the predominant oxygen reduction occurs. Therefore, an increase in the reverse current, with potentials more positive than 1.0 V, can be explained by the effect of oxygen adsorption on the surface of gas-permeable mesh steel cathodes when air is supplied. The addition of hypochlorite ion has practically no effect on the current density in the first and second sections of the current – voltage
{"title":"SUBSTANTIATION OF TECHNOLOGICAL INDICATORS OF APPLICATION OF A GAS-DIFFUSION CATHODE IN ELECTROCHEMICAL SYNTHESIS OF HYPOCHLORITE SOLUTIONS","authors":"Katerina Rutkovska, Hennadii Tulskyi, Valerii Homozov, Alexandr Rusinov","doi":"10.20998/2079-0821.2020.02.02","DOIUrl":"https://doi.org/10.20998/2079-0821.2020.02.02","url":null,"abstract":"A gas diffusion electrode was used to implement depolarization of the cathodic process with atmospheric oxygen to improve the production of sodium hypochlorite by electrolysis of an aqueous solution of sodium chloride. As materials for the implementation of depolarization of the cathode process on a porous cathode from the grid, we selected: manganese oxides, cobalt oxides, ruthenium oxides. These oxides are characterized by low overvoltage of the oxygen reaction. Oxides of selected metals were applied to a mesh current lead by thermal decomposition of coating solutionsю. The gas diffusion electrode consisted of a lined titanium current lead, a dispersant of gas made of porous graphite, and an external mesh working element, on which cathodic reactions occurred. The preparation of a catalytically active layer of oxide-metal coatings was carried out by thermal decomposition of coating solutions. This method fully complies with the requirements for oxide-metal electrodes for the electrolysis of aqueous solutions of sodium chloride: the ability to control the composition of the composite coating in a wide range of component concentrations. On the current-voltage cyclic dependences of the cathodic process, for all the materials studied, certain areas of oxygen reduction and combined oxygen reduction and hydrogen evolution are observed. The first section of oxygen reduction is observed to the equilibrium potentials of the hydrogen reaction (approximately –0.42 V). The oxygen reduction rate is small and amounts to 3...5 mA/cm2. There is no difference in the current-voltage dependence due to the high potential sweep speed, which does not lead to oxygen depletion in the case of cathode operation without air supply. In the second section (at potentials, more negative equilibrium potentials of the hydrogen reaction), a significant increase in the rate of the cathodic reaction due to hydrogen evolution is observed. Oxygen, in this case, is reduced at the limiting current density. In the third section (more than –1.5 V), the speed of the cathodic process is almost completely determined by the rate of hydrogen evolution. The effect of air supply to the gas diffusion cathode is observed when comparing the reverse stroke of cyclic current–voltage dependences. On the surface of the steel mesh, an increase in the reverse current is observed in the potential range –1.0 to 0 V. Which indicates an increase in adsorbed particles involved in the cathodic process. As shown earlier, this range of potentials corresponds to the 1st and 2nd sections of the obtained dependences in which the predominant oxygen reduction occurs. Therefore, an increase in the reverse current, with potentials more positive than 1.0 V, can be explained by the effect of oxygen adsorption on the surface of gas-permeable mesh steel cathodes when air is supplied. The addition of hypochlorite ion has practically no effect on the current density in the first and second sections of the current – voltage","PeriodicalId":9407,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Chemistry, Chemical Technology and Ecology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83579291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-23DOI: 10.20998/2079-0821.2021.02.05
V. Sebko, Volodymyr Babenko, Yevheniia Pyrozhenko
The possibility of using the theory of operation of a differential inductive parametric eddy-current transducer (IPET) for measuring the electrical and temperature parameters of a sample of acidic and alkaline wastewater is investigated. The need for the development of new informative methods for measuring the physicochemical parameters of wastewater is proved, in the realization of which a promising method of purification is selected. On the basis of a differential scheme for switching on two parametric converters: with exemplary purified water and a converter in which a test tube with a sample of waste water from a brewing production is placed, a differential informative method for measuring the electrical and temperature parameters of the liquid under study is proposed, which is based on the analysis of the components of the difference signal of phase shift angles measured electrical components of the switching circuit signals. The basic relationships that describe the operation of the IPET with the sample of the controlled liquid are given. The scheme of switching on differential IPET with a liquid sample, which is placed in a glass test tube, is considered; the differential scheme provides for heating the sample during measurements to simulate the production conditions of brewing production. Universal transformation functions are given that relate the components of the IPET signals with the specific electrical conductivity χt.s. and the temperature t of the wastewater sample from brewing production, that is, the dependence of the phase difference signal Δj on the generalized parameter A and the dependence of the absolute increment in the specific electrical conductivity Δχ on the temperature t of the wastewater sample, in the investigated temperature range.
{"title":"INDUCTIVE PARAMETRIC EDDY-CURRENT TRANSDUCER (IPEP) FOR MEASURING ELECTRICAL AND TEMPERATURE PARAMETERS OF WASTEWATER FROM BREWING PRODUCTION","authors":"V. Sebko, Volodymyr Babenko, Yevheniia Pyrozhenko","doi":"10.20998/2079-0821.2021.02.05","DOIUrl":"https://doi.org/10.20998/2079-0821.2021.02.05","url":null,"abstract":"The possibility of using the theory of operation of a differential inductive parametric eddy-current transducer (IPET) for measuring the electrical and temperature parameters of a sample of acidic and alkaline wastewater is investigated. The need for the development of new informative methods for measuring the physicochemical parameters of wastewater is proved, in the realization of which a promising method of purification is selected. On the basis of a differential scheme for switching on two parametric converters: with exemplary purified water and a converter in which a test tube with a sample of waste water from a brewing production is placed, a differential informative method for measuring the electrical and temperature parameters of the liquid under study is proposed, which is based on the analysis of the components of the difference signal of phase shift angles measured electrical components of the switching circuit signals. The basic relationships that describe the operation of the IPET with the sample of the controlled liquid are given. The scheme of switching on differential IPET with a liquid sample, which is placed in a glass test tube, is considered; the differential scheme provides for heating the sample during measurements to simulate the production conditions of brewing production. Universal transformation functions are given that relate the components of the IPET signals with the specific electrical conductivity χt.s. and the temperature t of the wastewater sample from brewing production, that is, the dependence of the phase difference signal Δj on the generalized parameter A and the dependence of the absolute increment in the specific electrical conductivity Δχ on the temperature t of the wastewater sample, in the investigated temperature range.","PeriodicalId":9407,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Chemistry, Chemical Technology and Ecology","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75602759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-23DOI: 10.20998/2079-0821.2021.02.14
O. Fedorenko, L. Yashchenko, D. Fedorenko, V. Fedorovych, Oleksandr Koniev
Research is aimed at creating high-resource diamond-abrasive tools with a large-pore structure of the working layer, the use of which reduces the occurrence of grinding defects when processing materials sensitive to overheating. The formation of an open structure of the working layer ensures effective chip removal, which excludes a decrease in the сutting ability of the tool due to contamination with grinding sludge and creates favorable conditions for intensifying the processing of materials when using high-speed cutting modes. As part of the research, low-melting glass-ceramic binders for diamond-abrasive tools have been developed, which make it possible to increase the tool service life due to the prevention of diamond grains premature destruction and the creation of a large-pore open structure of the working layer. Using a set of calculated data about the main characteristics of glass compositions by factor planning means, the dependences «composition - properties» were determined and the area of optimal compositions of glass-ceramic bonds was established, which ensure sintering of a diamond-containing composite at a temperature of 550–650 °C. The efficiency of the use of alumino-silicate microspheres of technogenic origin as a structure-forming filler providing the formation of a large-pore structure is shown. The features of the chemical and phase composition of the technogenic spheres recovered from the fly ash of the Krivoy Rog TPP have been determined. It has been established that when the diamond-bearing layer of the tool is sintered in the shell of the ash spheres, crystalline new formations with high hardness (hercynite, mullite, maghemite, spinel) are formed. Using ash spheres and developed low-melting binders, which include up to 30 mass. % of glass waste, the laboratory samples of diamond-containing composites with open porosity of 45-50% were made. Studies of their microstructure and morphological features made it possible to determine the pore size (130-200 μm) and establish that during grinding, partial destruction of ash spheres occurs with the formation of additional cutting elements, which increases the tool cutting ability. The research results indicate the advisability of using the proposed approach for selection of the diamond-ceramic composite components and the modes of heat treatment of the diamond-bearing layer when creating a tool. This approach will significantly expand the possibilities of manufacturing large-pore diamond-abrasive tools with a high service life at minimal material costs and will improve the processing of parts made of difficult-to-machine materials.
{"title":"DEVELOPMENT OF LOW-MELTING GLASSCERAMIC BONDS FOR HIGH RESOURCE DIAMOND-ABRASIVE TOOLS","authors":"O. Fedorenko, L. Yashchenko, D. Fedorenko, V. Fedorovych, Oleksandr Koniev","doi":"10.20998/2079-0821.2021.02.14","DOIUrl":"https://doi.org/10.20998/2079-0821.2021.02.14","url":null,"abstract":"Research is aimed at creating high-resource diamond-abrasive tools with a large-pore structure of the working layer, the use of which reduces the occurrence of grinding defects when processing materials sensitive to overheating. The formation of an open structure of the working layer ensures effective chip removal, which excludes a decrease in the сutting ability of the tool due to contamination with grinding sludge and creates favorable conditions for intensifying the processing of materials when using high-speed cutting modes. As part of the research, low-melting glass-ceramic binders for diamond-abrasive tools have been developed, which make it possible to increase the tool service life due to the prevention of diamond grains premature destruction and the creation of a large-pore open structure of the working layer. Using a set of calculated data about the main characteristics of glass compositions by factor planning means, the dependences «composition - properties» were determined and the area of optimal compositions of glass-ceramic bonds was established, which ensure sintering of a diamond-containing composite at a temperature of 550–650 °C. The efficiency of the use of alumino-silicate microspheres of technogenic origin as a structure-forming filler providing the formation of a large-pore structure is shown. The features of the chemical and phase composition of the technogenic spheres recovered from the fly ash of the Krivoy Rog TPP have been determined. It has been established that when the diamond-bearing layer of the tool is sintered in the shell of the ash spheres, crystalline new formations with high hardness (hercynite, mullite, maghemite, spinel) are formed. Using ash spheres and developed low-melting binders, which include up to 30 mass. % of glass waste, the laboratory samples of diamond-containing composites with open porosity of 45-50% were made. Studies of their microstructure and morphological features made it possible to determine the pore size (130-200 μm) and establish that during grinding, partial destruction of ash spheres occurs with the formation of additional cutting elements, which increases the tool cutting ability. The research results indicate the advisability of using the proposed approach for selection of the diamond-ceramic composite components and the modes of heat treatment of the diamond-bearing layer when creating a tool. This approach will significantly expand the possibilities of manufacturing large-pore diamond-abrasive tools with a high service life at minimal material costs and will improve the processing of parts made of difficult-to-machine materials.","PeriodicalId":9407,"journal":{"name":"Bulletin of the National Technical University \"KhPI\". Series: Chemistry, Chemical Technology and Ecology","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76366248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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