Zineb Aouf, Sara Boughaba, Salah Lakrout, O. Bechiri, N. Aouf
A catalytic process for hydrophosphonylation of aldehydes with H6P2W18O62·14H2O has been developed in this paper. Various aldehydes were reacted with diethylphosphite in the presence of 1 % of heteropolyacids (HPAs) as a catalyst to generate the α-hydroxyphosphonates. All the synthesized compounds were sys tematically characterized by IR, H NMR, C NMR, and P NMR. Simple and mild method, short reaction time, solvent-free conditions, availability and reusability of the catalyst are the main advantages of this procedure.
{"title":"A Methodology Study of Hydrophosphonylation of Aldehydes Derivatives with H6P2W18O62•14H2O as a Catalyst","authors":"Zineb Aouf, Sara Boughaba, Salah Lakrout, O. Bechiri, N. Aouf","doi":"10.23939/chcht14.02.154","DOIUrl":"https://doi.org/10.23939/chcht14.02.154","url":null,"abstract":"A catalytic process for hydrophosphonylation of aldehydes with H6P2W18O62·14H2O has been developed in this paper. Various aldehydes were reacted with diethylphosphite in the presence of 1 % of heteropolyacids (HPAs) as a catalyst to generate the α-hydroxyphosphonates. All the synthesized compounds were sys tematically characterized by IR, H NMR, C NMR, and P NMR. Simple and mild method, short reaction time, solvent-free conditions, availability and reusability of the catalyst are the main advantages of this procedure.","PeriodicalId":9762,"journal":{"name":"Chemistry and Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84063948","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}
Tetiana Andriyivna Bilous, A. Tulskaya, I. Ryshchenko, I. Chahine, V. Bairachnyi
The kinetics of anodic processes on Pt/PtO and PbO2 anodes has been studied in water solutions of acetic acid. The addition of sulfuric acid has a catalytic effect in the electrochemical synthesis of peroxyacetic acid. The choice of promoters of peroxide-particles formation has been proved. I, Cl (current efficiency is 1.2–1.5 %) particles have been defined as the most effective for platinum anode and I, F (current efficiency is 0.50–0.55 %) have been defined as the most effective for lead-dioxide anode.
{"title":"Electrochemical Synthesis of Peroxyacetic Acid on Pt/PtO and PbO2 Anodes","authors":"Tetiana Andriyivna Bilous, A. Tulskaya, I. Ryshchenko, I. Chahine, V. Bairachnyi","doi":"10.23939/chcht14.02.135","DOIUrl":"https://doi.org/10.23939/chcht14.02.135","url":null,"abstract":"The kinetics of anodic processes on Pt/PtO and PbO2 anodes has been studied in water solutions of acetic acid. The addition of sulfuric acid has a catalytic effect in the electrochemical synthesis of peroxyacetic acid. The choice of promoters of peroxide-particles formation has been proved. I, Cl (current efficiency is 1.2–1.5 %) particles have been defined as the most effective for platinum anode and I, F (current efficiency is 0.50–0.55 %) have been defined as the most effective for lead-dioxide anode.","PeriodicalId":9762,"journal":{"name":"Chemistry and Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85148522","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 influence of the bacterial α-amylase type and temperature on the accumulation of soluble dry matter and reducing sugars during fermentation of wheat batch has been investigated. The correlation between thermal stability of α-amylase and process parameters is shown. The initial activity of the enzyme preparation affects the starch hydrolysis intensity. The change in the enzymes activity, occurred due to their inactivation at high temperatures, affects the maximum content of dry matter and reducing sugars in the liquefied matter.
{"title":"Study on the Effective Application of Bacterial α-Amylase for Batch Liquefaction","authors":"S. Melnyk, Y. Melnyk, B. Dzinyak, Z. Pikh","doi":"10.23939/chcht14.02.271","DOIUrl":"https://doi.org/10.23939/chcht14.02.271","url":null,"abstract":"The influence of the bacterial α-amylase type and temperature on the accumulation of soluble dry matter and reducing sugars during fermentation of wheat batch has been investigated. The correlation between thermal stability of α-amylase and process parameters is shown. The initial activity of the enzyme preparation affects the starch hydrolysis intensity. The change in the enzymes activity, occurred due to their inactivation at high temperatures, affects the maximum content of dry matter and reducing sugars in the liquefied matter.","PeriodicalId":9762,"journal":{"name":"Chemistry and Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75961139","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}
M. Tokareva, S. Tokarev, V. Vostres, S. TokarevViktor
The thermal decomposition of pendant peroxy groups in a cooligomer of maleic anhydride with 5-(tertbutylperoxy)-5-methylhex-1-en-3-yne as well as in its amino derivatives immobilized on different silica surfaces, has been investigated using a complex thermogravimetric analysis. Two types of silica: fumed (aerosil) and precipitated (white carbon black) ones have been surface modified by this cooligomer via diverse techniques. It has been established that in all the cases the cooligomer decomposition on the silica surface complies with the first-order kinetics. Estimated activation energy evidences lowering thermal stability of the immobilized peroxide cooligomer in comparison with its decomposition in a solution. Interestingly, on the surface of fumed silica the decomposition of peroxide cooligomers always occurs as a one-stage process, while on the surface of precipitated silica it can occur as a two-stage process. The reason for this phenomenon is a difference in the porosity and surface chemistry of these two silica samples.
{"title":"Effect of Silica Surface on Thermal Decomposition of the Immobilized Peroxide Oligomers","authors":"M. Tokareva, S. Tokarev, V. Vostres, S. TokarevViktor","doi":"10.23939/chcht14.02.205","DOIUrl":"https://doi.org/10.23939/chcht14.02.205","url":null,"abstract":"The thermal decomposition of pendant peroxy groups in a cooligomer of maleic anhydride with 5-(tertbutylperoxy)-5-methylhex-1-en-3-yne as well as in its amino derivatives immobilized on different silica surfaces, has been investigated using a complex thermogravimetric analysis. Two types of silica: fumed (aerosil) and precipitated (white carbon black) ones have been surface modified by this cooligomer via diverse techniques. It has been established that in all the cases the cooligomer decomposition on the silica surface complies with the first-order kinetics. Estimated activation energy evidences lowering thermal stability of the immobilized peroxide cooligomer in comparison with its decomposition in a solution. Interestingly, on the surface of fumed silica the decomposition of peroxide cooligomers always occurs as a one-stage process, while on the surface of precipitated silica it can occur as a two-stage process. The reason for this phenomenon is a difference in the porosity and surface chemistry of these two silica samples.","PeriodicalId":9762,"journal":{"name":"Chemistry and Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87452223","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}
https://doi.org/10.23939/chcht14.02.257 Abstract. The enhancement factor of air oxygen absorption by quinhydrone absorbing solution in the apparatus with a continuous bubbling layer and the rate constant for the reaction of chemisorbed oxygen and the reducing form of quinhydrone oligomers have been determined. The obtained results are of practical importance for the choice of mass-transfer apparatus for the regeneration of quinhydrone absorbing solution when removing hydrogen sulfide from gases.
{"title":"Study of Oxygen Chemisorption During Regeneration of Quinhydrone Absorbing Solution in the Apparatus with a Continuous Bubbling Layer","authors":"A. Slyuzar, Z. Znak, Y. Kalymon, A. Helesh","doi":"10.23939/chcht14.02.257","DOIUrl":"https://doi.org/10.23939/chcht14.02.257","url":null,"abstract":"https://doi.org/10.23939/chcht14.02.257 Abstract. The enhancement factor of air oxygen absorption by quinhydrone absorbing solution in the apparatus with a continuous bubbling layer and the rate constant for the reaction of chemisorbed oxygen and the reducing form of quinhydrone oligomers have been determined. The obtained results are of practical importance for the choice of mass-transfer apparatus for the regeneration of quinhydrone absorbing solution when removing hydrogen sulfide from gases.","PeriodicalId":9762,"journal":{"name":"Chemistry and Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86570221","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}
L. Patrylak, M. Krylova, O. Pertko, Y. Voloshyna, A. Yakovenko
Nickel-containing mordenite samples were synthesized by impregnation from aqua's solution of nickel nitrate. Porous and catalytic characteristics of the catalysts were studied by means of low temperature nitrogen adsorption/desorption and micropulse n-hexane isomerisation. The maximum isomer yields are 10-12 wt % for 1-5 wt % Ni content at 523–573 K.
{"title":"n-Hexane Isomerization Over Nickel-Containing Mordenite Zeolite","authors":"L. Patrylak, M. Krylova, O. Pertko, Y. Voloshyna, A. Yakovenko","doi":"10.23939/chcht14.02.234","DOIUrl":"https://doi.org/10.23939/chcht14.02.234","url":null,"abstract":"Nickel-containing mordenite samples were synthesized by impregnation from aqua's solution of nickel nitrate. Porous and catalytic characteristics of the catalysts were studied by means of low temperature nitrogen adsorption/desorption and micropulse n-hexane isomerisation. The maximum isomer yields are 10-12 wt % for 1-5 wt % Ni content at 523–573 K.","PeriodicalId":9762,"journal":{"name":"Chemistry and Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83904450","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}
M. Konyk, L. Romaka, P. Demchenko, V. Romaka, V. Krayovskyy, M. Rokomanyuk
The phase equilibrium diagram of the Y-CuGe ternary system was constructed at 870 K by X-ray diffractometry, metallographic and electron probe microanalyses over the whole concentration range. Formation of six ternary compounds YCuGe (LiGaGe-type), YCu2Ge2 (CeAl2Ga2-type), Y3Cu4Ge4 (Gd3Cu4Ge4-type), Y2CuGe6 (Ce2CuGe6-type), YCu0.67Ge1.33 (AlB2-type), and YCu0.3Ge2 (CeNiSi2-type) were observed.
{"title":"Experimental Study of the Y-Cu-Ge System at 870 K","authors":"M. Konyk, L. Romaka, P. Demchenko, V. Romaka, V. Krayovskyy, M. Rokomanyuk","doi":"10.23939/chcht14.02.177","DOIUrl":"https://doi.org/10.23939/chcht14.02.177","url":null,"abstract":"The phase equilibrium diagram of the Y-CuGe ternary system was constructed at 870 K by X-ray diffractometry, metallographic and electron probe microanalyses over the whole concentration range. Formation of six ternary compounds YCuGe (LiGaGe-type), YCu2Ge2 (CeAl2Ga2-type), Y3Cu4Ge4 (Gd3Cu4Ge4-type), Y2CuGe6 (Ce2CuGe6-type), YCu0.67Ge1.33 (AlB2-type), and YCu0.3Ge2 (CeNiSi2-type) were observed.","PeriodicalId":9762,"journal":{"name":"Chemistry and Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75509312","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}
L. Perekhoda, V. Georgiyants, H. Yeromina, I. Drapak, V. Lubenets, Z. Ieromina, I. Sych, H. Severina, A. Demchenko
As a part of our continuous research on potential antihypertensive agents among morpholine and piperidine derivatives, 10 novel target compounds containing 1,2,4-triazole and morpholine or piperidine moieties have been designed and synthesized, and the docking studies have been conducted in order to find biologically active substances with the antihypertensive activity. The in silico studies have shown that all compounds synthesized are promising angiotensin converting enzyme inhibitors and belong to the toxicity class 4 and 5 according to the classification of chemicals by the OECD project.
{"title":"The Synthesis and In Silico Antihypertensive Activity Prognosis of New Mannich Bases Containing the 1,2,4-Triazole Moiety","authors":"L. Perekhoda, V. Georgiyants, H. Yeromina, I. Drapak, V. Lubenets, Z. Ieromina, I. Sych, H. Severina, A. Demchenko","doi":"10.23939/chcht14.02.214","DOIUrl":"https://doi.org/10.23939/chcht14.02.214","url":null,"abstract":"As a part of our continuous research on potential antihypertensive agents among morpholine and piperidine derivatives, 10 novel target compounds containing 1,2,4-triazole and morpholine or piperidine moieties have been designed and synthesized, and the docking studies have been conducted in order to find biologically active substances with the antihypertensive activity. The in silico studies have shown that all compounds synthesized are promising angiotensin converting enzyme inhibitors and belong to the toxicity class 4 and 5 according to the classification of chemicals by the OECD project.","PeriodicalId":9762,"journal":{"name":"Chemistry and Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84187287","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}
Kancharla Ravichand, Vadeghar Ramesh Kumar, G. Prabhakar Reddy, S. Sridhar
https://doi.org/10.23939/chcht14.02.239 Abstract. Indigenous polyvinylidene fluoride (PVDF) membrane was hydrophilized by blending with polyvinyl alcohol (PVA) which was further cross-linked with glutaraldehyde and tested for surface water purification. Synthesized membranes were characterized by SEM and FTIR to study the surface and cross-sectional morphologies and intermolecular interactions, respectively. The effect of parameters, namely feed pressure, operational time, and the cross-linking agent concentration on the process efficiency was studied. PVDF/PVA blend membrane exhibited a reasonable process flux of 205 l/m·h at 0.5 MPa and ambient temperature of 308 K. Experimental data were fitted to the limiting flux, osmotic pressure and pore blocking model to find the suitable theoretical model to predict the effect of concentration polarization on the separation performance and back flushing frequency. Osmotic pressure model was found to be a suitable model and the predicted results from the model were in agreement with the experimental findings. After the model was validated for the synthesized membrane, the simulation was carried out to predict the cake formation and the back flushing time was found as 97 h. Cost estimation was carried out for a pilot plant of capacity of 1000 m/day to emphasize the economic feasibility of the developed process.
{"title":"Synthesis and Characterization of Indigenous Hydrophilized Polyvinylidene Fluoride Membrane for Drinking Water Purification: Experimentsal Study and Modeling Aspects","authors":"Kancharla Ravichand, Vadeghar Ramesh Kumar, G. Prabhakar Reddy, S. Sridhar","doi":"10.23939/chcht14.02.239","DOIUrl":"https://doi.org/10.23939/chcht14.02.239","url":null,"abstract":"https://doi.org/10.23939/chcht14.02.239 Abstract. Indigenous polyvinylidene fluoride (PVDF) membrane was hydrophilized by blending with polyvinyl alcohol (PVA) which was further cross-linked with glutaraldehyde and tested for surface water purification. Synthesized membranes were characterized by SEM and FTIR to study the surface and cross-sectional morphologies and intermolecular interactions, respectively. The effect of parameters, namely feed pressure, operational time, and the cross-linking agent concentration on the process efficiency was studied. PVDF/PVA blend membrane exhibited a reasonable process flux of 205 l/m·h at 0.5 MPa and ambient temperature of 308 K. Experimental data were fitted to the limiting flux, osmotic pressure and pore blocking model to find the suitable theoretical model to predict the effect of concentration polarization on the separation performance and back flushing frequency. Osmotic pressure model was found to be a suitable model and the predicted results from the model were in agreement with the experimental findings. After the model was validated for the synthesized membrane, the simulation was carried out to predict the cake formation and the back flushing time was found as 97 h. Cost estimation was carried out for a pilot plant of capacity of 1000 m/day to emphasize the economic feasibility of the developed process.","PeriodicalId":9762,"journal":{"name":"Chemistry and Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83689699","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}
Santosh S. Katkar, A. H. Kategaonkar, Kaluram N. Vidhate
We have studied a series of mixed metal oxides of Mg-Al by a simple co-precipitation technique. Various characterization techniques, including XRD, SEM, EDS, TEM, BET and CO2-TPD were carried out to investigate their physicochemical properties. An efficient and facile protocol has been documented for the synthesis of chalcones using different aldehydes and acetophenone using Mg-Al oxide under reflux conditions in ethanol affording good to excellent yields. Recyclability of a catalyst is a significant feature of this protocol. Moreover, it was proposed that MgO can disperse and increase the basicity, pore size and catalytic activity.
{"title":"MgO Supported Al2O3 Oxide: A New, Efficient, and Reusable Catalyst for Synthesis of Chalcones","authors":"Santosh S. Katkar, A. H. Kategaonkar, Kaluram N. Vidhate","doi":"10.23939/chcht14.02.169","DOIUrl":"https://doi.org/10.23939/chcht14.02.169","url":null,"abstract":"We have studied a series of mixed metal oxides of Mg-Al by a simple co-precipitation technique. Various characterization techniques, including XRD, SEM, EDS, TEM, BET and CO2-TPD were carried out to investigate their physicochemical properties. An efficient and facile protocol has been documented for the synthesis of chalcones using different aldehydes and acetophenone using Mg-Al oxide under reflux conditions in ethanol affording good to excellent yields. Recyclability of a catalyst is a significant feature of this protocol. Moreover, it was proposed that MgO can disperse and increase the basicity, pore size and catalytic activity.","PeriodicalId":9762,"journal":{"name":"Chemistry and Chemical Technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84361505","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：