Pub Date : 2017-05-06DOI: 10.2298/HEMIND161130006S
D. Sokić, N. Stojanovic, R. B. Markovic, Mladen Bugarčić, D. Strbac, J. Kamberović, D. Manojlović
U radu su prikazani rezultati ispitivanja uticaja strukturno-teksturnih karakteristika sulfidnih minerala na njihovo luženje iz polimetalicnog koncentrata rastvorom sumporne kiseline i natrijum-nitrata. Za određivanja karakteristika sulfidnih minerala u polaznom koncentratu i cvrstom ostatku luženja koriscena je hemijska, rendgenska difrakciona analiza na polikristalnom uzorku (XRD), kvalitativna i kvantitativna mikroskopska i SEM/EDX analiza. U polimetalicnom koncentratu je utvrđeno prisustvo halkopirita, sfalerita, galenita, pirotina i minerala jalovine. Tokom luženja Pb–Zn–Cu sulfidnog koncentrata rastvorom natrijum-nitrata i sumporne kiseline, deo sulfidnih minerala ostaje neizlužen i zaostaje u cvrstim ostacima luženja. Olovo, u obliku slaborastvornog olovo-sulfata (anglezita), ostaje u neizluženom ostatku. Sadržaj sulfidnih minerala u neizluženom ostatku iznosi 35%, u kojem se 54,7% halkopirita, 31,9% sfalerita, 8,2% galenita i 37,6% pirotina javlja u vidu slobodnih mineralnih zrna sa intenzivnom korozijom njihovih ivica i pojavom elementarnog sumpora duž njihovih oboda. Strukturni sklop sulfidnih mineralnih zrna u polimetalicnom koncentratu je povolјan i nije razlog prisustva neizluženih sulfidnih minerala u cvrstim ostacima luženja. Razlog za to je elementarni sumpor koji nastaje u procesu luženja, taloži se na povrsini sulfidnih mineralnih zrna i otežava kontakt sulfidnih minerala i sredstva za luženje
{"title":"Effects of structural and textural grain characteristics on leaching of sulphide minerals from a polymetallic concentrate by sodium nitrate and sulphuric acid solution","authors":"D. Sokić, N. Stojanovic, R. B. Markovic, Mladen Bugarčić, D. Strbac, J. Kamberović, D. Manojlović","doi":"10.2298/HEMIND161130006S","DOIUrl":"https://doi.org/10.2298/HEMIND161130006S","url":null,"abstract":"U radu su prikazani rezultati ispitivanja uticaja strukturno-teksturnih karakteristika sulfidnih minerala na njihovo luženje iz polimetalicnog koncentrata rastvorom sumporne kiseline i natrijum-nitrata. Za određivanja karakteristika sulfidnih minerala u polaznom koncentratu i cvrstom ostatku luženja koriscena je hemijska, rendgenska difrakciona analiza na polikristalnom uzorku (XRD), kvalitativna i kvantitativna mikroskopska i SEM/EDX analiza. U polimetalicnom koncentratu je utvrđeno prisustvo halkopirita, sfalerita, galenita, pirotina i minerala jalovine. Tokom luženja Pb–Zn–Cu sulfidnog koncentrata rastvorom natrijum-nitrata i sumporne kiseline, deo sulfidnih minerala ostaje neizlužen i zaostaje u cvrstim ostacima luženja. Olovo, u obliku slaborastvornog olovo-sulfata (anglezita), ostaje u neizluženom ostatku. Sadržaj sulfidnih minerala u neizluženom ostatku iznosi 35%, u kojem se 54,7% halkopirita, 31,9% sfalerita, 8,2% galenita i 37,6% pirotina javlja u vidu slobodnih mineralnih zrna sa intenzivnom korozijom njihovih ivica i pojavom elementarnog sumpora duž njihovih oboda. Strukturni sklop sulfidnih mineralnih zrna u polimetalicnom koncentratu je povolјan i nije razlog prisustva neizluženih sulfidnih minerala u cvrstim ostacima luženja. Razlog za to je elementarni sumpor koji nastaje u procesu luženja, taloži se na povrsini sulfidnih mineralnih zrna i otežava kontakt sulfidnih minerala i sredstva za luženje","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42411457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-02-28DOI: 10.2298/HEMIND151119011P
V. Pavićević, Marko N. Radović, Svetomir Ž. Milojević, Miljana S. Marković, M. Ristić, D. Povrenović
U radu su prikazane promene hemijskog sastava etarskog ulja dobijenog hidrodestilacijom ploda kleke u zavisnosti od brzine destilacije i odnosa mase kleka − voda ( hidromodula ). Odabrane su 23 komponente (od ukupno 58 određenih) sa masenim udelom vecim od 0,5%. Najzastupljeniji su bili monoterpeni, zatim seskviterpeni i mnogo manje oksigenovani ugljovodonici. Prema isparljivosti, najvise je bilo lakoisparljivih, zatim teskoisparljivih i najmanje srednjeisparljivih komponenata. Sa povecanjem brzine destilacije, maseni udeo lakoisparljivih i srednjeisparljivih komponenti se smanjuje, dok se maseni udeo teskoisparljivih komponenti povecava. Promene hidromodula su znatno manje uticale na maseni sastav nego promene brzine destilacije. Eksperimente hidrodestilacije treba nastaviti pri razlicitim brzinama destilacije, ukljucujuci istovremenu rektifikaciju, uticaj pripreme kleke i određivanje optimalne potrosnje energije.
{"title":"Influence of hydrodistillation rate and hydromodule on chemical composition of Juniperus communis L. essential oil","authors":"V. Pavićević, Marko N. Radović, Svetomir Ž. Milojević, Miljana S. Marković, M. Ristić, D. Povrenović","doi":"10.2298/HEMIND151119011P","DOIUrl":"https://doi.org/10.2298/HEMIND151119011P","url":null,"abstract":"U radu su prikazane promene hemijskog sastava etarskog ulja dobijenog hidrodestilacijom ploda kleke u zavisnosti od brzine destilacije i odnosa mase kleka − voda ( hidromodula ). Odabrane su 23 komponente (od ukupno 58 određenih) sa masenim udelom vecim od 0,5%. Najzastupljeniji su bili monoterpeni, zatim seskviterpeni i mnogo manje oksigenovani ugljovodonici. Prema isparljivosti, najvise je bilo lakoisparljivih, zatim teskoisparljivih i najmanje srednjeisparljivih komponenata. Sa povecanjem brzine destilacije, maseni udeo lakoisparljivih i srednjeisparljivih komponenti se smanjuje, dok se maseni udeo teskoisparljivih komponenti povecava. Promene hidromodula su znatno manje uticale na maseni sastav nego promene brzine destilacije. Eksperimente hidrodestilacije treba nastaviti pri razlicitim brzinama destilacije, ukljucujuci istovremenu rektifikaciju, uticaj pripreme kleke i određivanje optimalne potrosnje energije.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46536069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2298/HEMIND170726019P
I. Pantelić, T. Ilić, B. Marković, Sanela M. Savic, M. Lukić, S. Savić
After decades long absence of an official consensus on the most appropriate evaluation method for in vitro skin performance of topical semisolid drugs, United States Pharmacopoeia (USP 39) finally suggested three types of testing equipment; however, all these provide data on drug release using inert synthetic membranes. Considering the need for a readily available membrane that would be more structurally similar to human skin, this paper provides a detailed protocol of a method for drug permeation assessment that uses heat-separated porcine ear epidermis and modified Franz diffusion cells. Phases that were shown to be critical for variability of the results are identified ( e.g. membrane preparation), and process parameters optimized. Applicability of the method was tested on four cream samples loaded with aceclofenac as a model drug. Sample compositions were designed in such a way to provide „large“ variations (variation of the main stabilizer: natural-origin versus synthetic emulsifier) and relatively „minor“ variations (co-solvent variation: none/isopropanol/glycerol). The developed protocol is a straightforward and reliable in vitro test for the evaluation of rate and extent of drug delivery into/through the skin. Moreover, this protocol may be routinely applied even in averagely equipped laboratories during formulation development or preliminary bioequivalence assessment of generic topical semisolids.
{"title":"A stepwise protocol for drug permeation assessment that combines heat-separated porcine ear epidermis and vertical diffusion cells","authors":"I. Pantelić, T. Ilić, B. Marković, Sanela M. Savic, M. Lukić, S. Savić","doi":"10.2298/HEMIND170726019P","DOIUrl":"https://doi.org/10.2298/HEMIND170726019P","url":null,"abstract":"After decades long absence of an official consensus on the most appropriate evaluation method for in vitro skin performance of topical semisolid drugs, United States Pharmacopoeia (USP 39) finally suggested three types of testing equipment; however, all these provide data on drug release using inert synthetic membranes. Considering the need for a readily available membrane that would be more structurally similar to human skin, this paper provides a detailed protocol of a method for drug permeation assessment that uses heat-separated porcine ear epidermis and modified Franz diffusion cells. Phases that were shown to be critical for variability of the results are identified ( e.g. membrane preparation), and process parameters optimized. Applicability of the method was tested on four cream samples loaded with aceclofenac as a model drug. Sample compositions were designed in such a way to provide „large“ variations (variation of the main stabilizer: natural-origin versus synthetic emulsifier) and relatively „minor“ variations (co-solvent variation: none/isopropanol/glycerol). The developed protocol is a straightforward and reliable in vitro test for the evaluation of rate and extent of drug delivery into/through the skin. Moreover, this protocol may be routinely applied even in averagely equipped laboratories during formulation development or preliminary bioequivalence assessment of generic topical semisolids.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68380617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2298/HEMIND170124011K
S. Konstantinović, Z. M. Zlatkovic, T. J. Ciric, B. Ilić, D. G. Gojgic-Cvijovic, B. Veljkovic
In the present work, four derivatives of salicylaldehyde (salicylaldehyde-hydrazone, phenylhydrazone, semicarbazone and thiosemicarbazone) were synthesized using both conventional (95% ethanol) and green (crude glycerol from biodiesel production) solvents. The obtained compounds were identified by elemental microanalysis, as well as FTIR, UV/VIS, 1H NMR and X-ray spectroscopic methods. Yields of 93-98% of the compounds in crude glycerol were achieved within 10-25 min. The derivatives of salicylaldehyde and crude glycerol were used as a nitrogen and carbon source, respectively, in the medium for antibiotic (Hexaene H-85 and Azalomycine B) production by Streptomyces hygroscopicus CH-7. The highest concentrations of Hexaene H-85 and Azalomycine B were achieved in the medium containing salicylaldehyde-thiosemicarbazone (198 g/cm3 and 69 µg/cm3, respectively). Derivatives of salicylaldehyde also impacted the strain morphology. In the media with salicylaldehyde-phenylhydrazone and salicylaldehyde-thiosemicarbazone, S. hygroscopicus CH-7 grew like large dispersive pellets with long twisted filaments that produced the highest yield of the antibiotics.
{"title":"The use of salicylaldehyde derivatives as a nitrogen source for antibiotic production by Streptomyces hygroscopicus CH-7","authors":"S. Konstantinović, Z. M. Zlatkovic, T. J. Ciric, B. Ilić, D. G. Gojgic-Cvijovic, B. Veljkovic","doi":"10.2298/HEMIND170124011K","DOIUrl":"https://doi.org/10.2298/HEMIND170124011K","url":null,"abstract":"In the present work, four derivatives of salicylaldehyde (salicylaldehyde-hydrazone, phenylhydrazone, semicarbazone and thiosemicarbazone) were synthesized using both conventional (95% ethanol) and green (crude glycerol from biodiesel production) solvents. The obtained compounds were identified by elemental microanalysis, as well as FTIR, UV/VIS, 1H NMR and X-ray spectroscopic methods. Yields of 93-98% of the compounds in crude glycerol were achieved within 10-25 min. The derivatives of salicylaldehyde and crude glycerol were used as a nitrogen and carbon source, respectively, in the medium for antibiotic (Hexaene H-85 and Azalomycine B) production by Streptomyces hygroscopicus CH-7. The highest concentrations of Hexaene H-85 and Azalomycine B were achieved in the medium containing salicylaldehyde-thiosemicarbazone (198 g/cm3 and 69 µg/cm3, respectively). Derivatives of salicylaldehyde also impacted the strain morphology. In the media with salicylaldehyde-phenylhydrazone and salicylaldehyde-thiosemicarbazone, S. hygroscopicus CH-7 grew like large dispersive pellets with long twisted filaments that produced the highest yield of the antibiotics.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68380174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2298/hemind161213016r
N. Radovanovic, P. Nikolić, M. Djurovic, Z. Jugovic, M. Gvozdenović, N. B. Grgur, D. Z. Knezevic-Jugovic
{"title":"Polyaniline stabilization of magnetic particles and immobilization of alpha-amylase","authors":"N. Radovanovic, P. Nikolić, M. Djurovic, Z. Jugovic, M. Gvozdenović, N. B. Grgur, D. Z. Knezevic-Jugovic","doi":"10.2298/hemind161213016r","DOIUrl":"https://doi.org/10.2298/hemind161213016r","url":null,"abstract":"","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68380293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2298/HEMIND170327013D
Snežana Dimitrijević, D. Radanović, S. Antić-Mladenović, Milica Milutinović, M. Rajilić-Stojanović, S. Dimitrijević-Branković
Mixed medicinal plant waste was composted with addition of novel bacterial strains belonging to the genera Streptomyces, Paenybacillus, Bacillus and Hymenobacter . The composting was followed by assessment of chemical and biological parameters including C/N ratio, loss of organic matter, phosphorous and potassium content as well as CO 2 generation and dehydrogenase activity during 164 days. The selected mesophilic bacterial starters had a potential to significantly reduce the period of mixed herb waste decomposition, from about 6 months to about 2.5 months. Based on the seed germination index of four plants ( Fagopirum esculentum, Thymus vulgaris, Cynara scolimus and Lavandula officinalis ) the germination and radial root growth of the investigated plants was improved by the inoculated compost. The germination index of all tested species on the mature inoculated composts was in average 60% higher compared to the control compost. The research indicates that the mesophilic starter addition into the herbs waste can contribute to the speed of waste decomposition and lead to the improvement of biofertilization effect of the obtained compost.
{"title":"Enhanced fertilization effect of a compost obtained from mixed herbs waste inoculated with novel strains of mesophilic bacteria","authors":"Snežana Dimitrijević, D. Radanović, S. Antić-Mladenović, Milica Milutinović, M. Rajilić-Stojanović, S. Dimitrijević-Branković","doi":"10.2298/HEMIND170327013D","DOIUrl":"https://doi.org/10.2298/HEMIND170327013D","url":null,"abstract":"Mixed medicinal plant waste was composted with addition of novel bacterial strains belonging to the genera Streptomyces, Paenybacillus, Bacillus and Hymenobacter . The composting was followed by assessment of chemical and biological parameters including C/N ratio, loss of organic matter, phosphorous and potassium content as well as CO 2 generation and dehydrogenase activity during 164 days. The selected mesophilic bacterial starters had a potential to significantly reduce the period of mixed herb waste decomposition, from about 6 months to about 2.5 months. Based on the seed germination index of four plants ( Fagopirum esculentum, Thymus vulgaris, Cynara scolimus and Lavandula officinalis ) the germination and radial root growth of the investigated plants was improved by the inoculated compost. The germination index of all tested species on the mature inoculated composts was in average 60% higher compared to the control compost. The research indicates that the mesophilic starter addition into the herbs waste can contribute to the speed of waste decomposition and lead to the improvement of biofertilization effect of the obtained compost.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68380301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2298/HEMIND161204009M
Miljana S. Marković, N. Boskovic-Vragolovic, M. Ristić, V. Pavićević, V. Veljković, Svetomir Ž. Milojević
This paper deals with fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation (HD) and simultaneous hydrodistillation and rectification (SHDR) at atmospheric pressure. A rectification column was filled with the NORMAG packing A type and had 36 theoretical stages. In the present study, higher essential oil yield was obtained by HD (1.34 mass %) than by SHDR (1.17 mass %). However, mass fraction distributions of monoterpene hydrocarbons (MHs), oxygenated monoterpenes (OMs) and sesquiterpene hydrocarbons (SHs), observed for the two separation methods, differed from each other. In the SHDR process increased contents of high volatile components (predominantly MHs) were obtained in the initial fractions as well as increased contents of low volatile components (dominantly SHs) in the last fractions. Also, this method increased the separation degree of OMs.
研究了常压加氢精馏(HD)和同步加氢精馏(SHDR)对杜松(Juniperus communis L.)浆果精油的分离。精馏塔采用NORMAG填料A型填充，共36个理论级。在本研究中，HD(1.34质量%)比SHDR(1.17质量%)获得更高的精油得率。然而，两种分离方法所观察到的单萜烯烃(MHs)、氧化单萜烯(OMs)和倍半萜烯烃(SHs)的质量分数分布却存在差异。在SHDR过程中，初始馏分中高挥发性成分(主要是hs)的含量增加，而末馏分中低挥发性成分(主要是SHs)的含量增加。同时，该方法提高了OMs的分离度。
{"title":"Fractionation of the essential oil from juniper (Juniperus ommunis L.) berries by hydrodistillation and rectification","authors":"Miljana S. Marković, N. Boskovic-Vragolovic, M. Ristić, V. Pavićević, V. Veljković, Svetomir Ž. Milojević","doi":"10.2298/HEMIND161204009M","DOIUrl":"https://doi.org/10.2298/HEMIND161204009M","url":null,"abstract":"This paper deals with fractionation of the essential oil from juniper (Juniperus communis L.) berries by hydrodistillation (HD) and simultaneous hydrodistillation and rectification (SHDR) at atmospheric pressure. A rectification column was filled with the NORMAG packing A type and had 36 theoretical stages. In the present study, higher essential oil yield was obtained by HD (1.34 mass %) than by SHDR (1.17 mass %). However, mass fraction distributions of monoterpene hydrocarbons (MHs), oxygenated monoterpenes (OMs) and sesquiterpene hydrocarbons (SHs), observed for the two separation methods, differed from each other. In the SHDR process increased contents of high volatile components (predominantly MHs) were obtained in the initial fractions as well as increased contents of low volatile components (dominantly SHs) in the last fractions. Also, this method increased the separation degree of OMs.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68379700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2298/HEMIND170530014M
W. Musraty, B. Medjo, N. Gubeljak, Primož Štefane, Z. Radosavljevic, Z. Burzić, M. Rakin
Pipelines are commonly used in process industry for transport of fluids, as well as granular solids, due to their numerous advantages in comparison to other transportation means. Pipe integrity is essential for a reliable work of the entire plant, as well as for safety assurance. Also, serious ecological consequences may follow the pipeline failure in some cases, i.e. due to the leak of toxic, flammable or otherwise dangerous fluids in a chemical or some other plant. Therefore, it is very important to examine the fracture behaviour of pipelines, which is done here by testing the recently proposed ring-shaped specimens exposed to bending. The specimens were fabricated from a seam pipe for pressure applications (allowed for usage on temperatures up to 300 °C). Initial defects, very narrow notches, were machined either in the base metal and weld metal (seam) or in the base metal only. Regardless of the defect position, ductile fracture mechanism is observed in all specimens. The results show that the ring-shaped specimen can be successfully used for fracture characterisation of pipeline material, especially for thin-walled pipes which are not suitable for production of standard fracture mechanics specimens due to the insufficient wall thickness.
{"title":"Seam pipes for process industry - fracture analysis by using ring-shaped specimens","authors":"W. Musraty, B. Medjo, N. Gubeljak, Primož Štefane, Z. Radosavljevic, Z. Burzić, M. Rakin","doi":"10.2298/HEMIND170530014M","DOIUrl":"https://doi.org/10.2298/HEMIND170530014M","url":null,"abstract":"Pipelines are commonly used in process industry for transport of fluids, as well as granular solids, due to their numerous advantages in comparison to other transportation means. Pipe integrity is essential for a reliable work of the entire plant, as well as for safety assurance. Also, serious ecological consequences may follow the pipeline failure in some cases, i.e. due to the leak of toxic, flammable or otherwise dangerous fluids in a chemical or some other plant. Therefore, it is very important to examine the fracture behaviour of pipelines, which is done here by testing the recently proposed ring-shaped specimens exposed to bending. The specimens were fabricated from a seam pipe for pressure applications (allowed for usage on temperatures up to 300 °C). Initial defects, very narrow notches, were machined either in the base metal and weld metal (seam) or in the base metal only. Regardless of the defect position, ductile fracture mechanism is observed in all specimens. The results show that the ring-shaped specimen can be successfully used for fracture characterisation of pipeline material, especially for thin-walled pipes which are not suitable for production of standard fracture mechanics specimens due to the insufficient wall thickness.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68381004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2298/HEMIND170428015K
Vladan Kašić, Slavica Mihajlović, D. Životić, V. Šimić, J. Stojanovic, Ž. Sekulić, M. Kragović
U radu su prikazani rezultati ispitivanja zeolitskog tufa iz ležista „Igros-Vidojevici“ u cilju sagledavanja mineragenetske karakteristike ležista, utvrđivanja kvaliteta zeolita, primene i nacina valorizacije. Iz tih razloga je uzet uzorak iz podine ležista „Zeolit 1“ i uzorci sredisnjeg dela ležista „Zeolit 2“, „Zeolit 3“, „Zeolit 4“ i „Zeolit 5“. U karakterizaciji uzoraka primenjene su sledece metode: elementna hemijska analiza, kvantitativna SEM/EDS analiza, određivanje koeficijenta adsorpcije metilen plavog i kapaciteta katjonske izmene (KKI), rendgenska difrakcija praha (RDP), termijska analiza (TG, DTA) i i nfracrvena spektroskopija sa Furijeovom transformacijom (FTIR). Rezultati rendgenske i termijske analize su pokazali da podinu ležista u najvecoj meri cini glina, dok je u ostataku ležista zeolit. Sa mineragenetskog aspekta zapaža se da se radi o zeolitu-klinoptilolitu koje je najvece u uzorcima „Zeolit 2“ i „Zeolit 3“, pa su oni i najkvalitetniji. Na to ukazuju i vrednosti njihovog KKI i to 141,99 mmol/100g odnosno 121,01 mmol/100g. Uzorci „Zeolit 4“ i „Zeolit 5“ imaju nesto manji KKI (89,48 mmol/100g i 83,75 mmol/100g), losijeg su kvaliteta. Rezultati rendgenske i termijske analize su pokazali da podinu ležista u najvecoj meri cini glina, dok je u ostataku ležista zeolit. Sa mineragenijskog aspekta se može reci da je prisustvo zeolitskih minerala hojlanditskog tipa najvece u uzorcima „Zeolit 2“ i „Zeolit 3“, pa su oni i najkvalitetniji. Na to ukazuju i visoke vrednosti njihovog KKI i to 141,99 meq/100g odnosno 121,01 meq/100g. Zbog toga bi ovi uzorci mogli imati prakticnu primenu kao adsorbenti neorganskih zagađivaca iz kontaminiranih voda, a zbog visokog sadržaja osnovnog zeolitskog minerala potencijalno se mogu koristiti i kao sredstvo za uklanjanje mikotoksina iz stocne hrane. Uzorci „Zeolit 4“ i „Zeolit 5“ imaju nesto niži KKI (89,48 meq/100g i 83,75 meq/100g), slabijeg su kvaliteta, pa se potencijalno mogu upotrebiti za poboljsanje kvaliteta zemljista.
{"title":"Characterization of the zeolitic tuff from the “Igros-Vidojevici” deposit regarding geological and technological aspects","authors":"Vladan Kašić, Slavica Mihajlović, D. Životić, V. Šimić, J. Stojanovic, Ž. Sekulić, M. Kragović","doi":"10.2298/HEMIND170428015K","DOIUrl":"https://doi.org/10.2298/HEMIND170428015K","url":null,"abstract":"U radu su prikazani rezultati ispitivanja zeolitskog tufa iz ležista „Igros-Vidojevici“ u cilju sagledavanja mineragenetske karakteristike ležista, utvrđivanja kvaliteta zeolita, primene i nacina valorizacije. Iz tih razloga je uzet uzorak iz podine ležista „Zeolit 1“ i uzorci sredisnjeg dela ležista „Zeolit 2“, „Zeolit 3“, „Zeolit 4“ i „Zeolit 5“. U karakterizaciji uzoraka primenjene su sledece metode: elementna hemijska analiza, kvantitativna SEM/EDS analiza, određivanje koeficijenta adsorpcije metilen plavog i kapaciteta katjonske izmene (KKI), rendgenska difrakcija praha (RDP), termijska analiza (TG, DTA) i i nfracrvena spektroskopija sa Furijeovom transformacijom (FTIR). Rezultati rendgenske i termijske analize su pokazali da podinu ležista u najvecoj meri cini glina, dok je u ostataku ležista zeolit. Sa mineragenetskog aspekta zapaža se da se radi o zeolitu-klinoptilolitu koje je najvece u uzorcima „Zeolit 2“ i „Zeolit 3“, pa su oni i najkvalitetniji. Na to ukazuju i vrednosti njihovog KKI i to 141,99 mmol/100g odnosno 121,01 mmol/100g. Uzorci „Zeolit 4“ i „Zeolit 5“ imaju nesto manji KKI (89,48 mmol/100g i 83,75 mmol/100g), losijeg su kvaliteta. Rezultati rendgenske i termijske analize su pokazali da podinu ležista u najvecoj meri cini glina, dok je u ostataku ležista zeolit. Sa mineragenijskog aspekta se može reci da je prisustvo zeolitskih minerala hojlanditskog tipa najvece u uzorcima „Zeolit 2“ i „Zeolit 3“, pa su oni i najkvalitetniji. Na to ukazuju i visoke vrednosti njihovog KKI i to 141,99 meq/100g odnosno 121,01 meq/100g. Zbog toga bi ovi uzorci mogli imati prakticnu primenu kao adsorbenti neorganskih zagađivaca iz kontaminiranih voda, a zbog visokog sadržaja osnovnog zeolitskog minerala potencijalno se mogu koristiti i kao sredstvo za uklanjanje mikotoksina iz stocne hrane. Uzorci „Zeolit 4“ i „Zeolit 5“ imaju nesto niži KKI (89,48 meq/100g i 83,75 meq/100g), slabijeg su kvaliteta, pa se potencijalno mogu upotrebiti za poboljsanje kvaliteta zemljista.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68380202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-01-01DOI: 10.2298/HEMIND170402017K
Ivana T. Karabegović, S. Stojičević, D. Veličković, N. Nikolić, M. Lazić
The effects of ultrasound power and frequency on the yield of total extractive substances (TES), total phenolic content (TPC), total flavonoid content (TFC) and antioxidant activity (AOA) of fresh houseleek leaves extracts obtained by direct ultrasound-assisted extraction (DUAE) were studied. Preliminary extraction of plant material was performed using methanol, acetone and 2-propanol by Soxhlet extraction. It was found that maximum TES yield could be obtained by methanol extraction (2.91±0.02), followed by acetone and 2-propanol with a TES yield of 2.32±0.01 and 2.01±0.03 g per 100 g of fresh plant material, respectively. In the fresh houseleek leaves extracts obtained by DUAE and methanol as the chosen solvent, TPC, TFC and AOA were in the ranges of: 40.5-85.9 mg gallic acid/g dry extract, 12.7-19.3 mg rutin/g dry extract and 24.6-108.2µg/ml, respectively. The results showed that the increase in the ultrasound power and extraction time have positive and significant (p<0.05) effects on the TPC, TFC and AOA, while the increase in the ultrasound frequency leads to a decrease in the TPC, TFC and AOA of the extracts. A chromatographic analysis of crude extract identified the following: Kaempferol 3-O-(6’’-O-malonylglucoside)-7-O-glucosyde, Kaempferol 3-O glucoside-7-O-rhamnoside, Luteolin 5-O-(6’’-O-malonylglucoside), Kaempferol 3-O-(6’’-O-acetylglucoside)-7-O-rhamnoside, Genkwanin 5-O-glucoside, Luteolin 5-O-(6’’-O-malonylglucoside), Kaempferol 3-O-(6’’-O-malonylglucoside), Kaempferol 3-O-rhamnoside, Quercetin, Genkwanin 4’-O-glucoside and Hyperoside.
研究了超声功率和超声频率对直接超声辅助提取(DUAE)鲜家居叶提取物总萃取物(TES)、总酚含量(TPC)、总黄酮含量(TFC)和抗氧化活性(AOA)的影响。以甲醇、丙酮和2-丙醇为原料，采用索氏萃取法对植物原料进行初步提取。结果表明，甲醇提取的TES产率最高(2.91±0.02)，其次是丙酮和2-丙醇，每100 g新鲜植物材料的TES产率分别为2.32±0.01和2.01±0.03 g。以DUAE和甲醇为溶剂得到的鲜周叶提取物中，TPC、TFC和AOA含量分别在40.5 ~ 85.9 mg没食子酸/g干提取物、12.7 ~ 19.3 mg芦丁/g干提取物和24.6 ~ 108.2µg/ml范围内。结果表明，超声功率和提取时间的增加对提取物的TPC、TFC和AOA均有显著正相关影响(p<0.05)，而超声频率的增加导致提取物的TPC、TFC和AOA降低。对粗提物进行色谱分析，鉴定出下列成分:山奈酚3-O-(6′- o -丙二醇葡萄糖苷)-7- o -葡萄糖苷、山奈酚3-O-(6′- o -丙二醇葡萄糖苷)、木犀草素5-O-(6′- o -丙二醇葡萄糖苷)-7- o -鼠李糖糖苷、木犀草素5-O-(6′- o -丙二醇葡萄糖苷)、山奈酚3-O-(6′- o -丙二醇葡萄糖苷)、山奈酚3-O-(6′- o -丙二醇葡萄糖苷)、山奈酚3-O-(6′- o -丙二醇葡萄糖苷)、山奈酚3-O-(6′- o -丙二醇葡萄糖苷、槲皮素、山奈酚4′- o -葡萄糖苷和金丝桃苷。
{"title":"Direct ultrasound-assisted extraction and characterization of phenolic compounds from fresh houseleek (Sempervivum marmoreum L.) leaves","authors":"Ivana T. Karabegović, S. Stojičević, D. Veličković, N. Nikolić, M. Lazić","doi":"10.2298/HEMIND170402017K","DOIUrl":"https://doi.org/10.2298/HEMIND170402017K","url":null,"abstract":"The effects of ultrasound power and frequency on the yield of total extractive substances (TES), total phenolic content (TPC), total flavonoid content (TFC) and antioxidant activity (AOA) of fresh houseleek leaves extracts obtained by direct ultrasound-assisted extraction (DUAE) were studied. Preliminary extraction of plant material was performed using methanol, acetone and 2-propanol by Soxhlet extraction. It was found that maximum TES yield could be obtained by methanol extraction (2.91±0.02), followed by acetone and 2-propanol with a TES yield of 2.32±0.01 and 2.01±0.03 g per 100 g of fresh plant material, respectively. In the fresh houseleek leaves extracts obtained by DUAE and methanol as the chosen solvent, TPC, TFC and AOA were in the ranges of: 40.5-85.9 mg gallic acid/g dry extract, 12.7-19.3 mg rutin/g dry extract and 24.6-108.2µg/ml, respectively. The results showed that the increase in the ultrasound power and extraction time have positive and significant (p<0.05) effects on the TPC, TFC and AOA, while the increase in the ultrasound frequency leads to a decrease in the TPC, TFC and AOA of the extracts. A chromatographic analysis of crude extract identified the following: Kaempferol 3-O-(6’’-O-malonylglucoside)-7-O-glucosyde, Kaempferol 3-O glucoside-7-O-rhamnoside, Luteolin 5-O-(6’’-O-malonylglucoside), Kaempferol 3-O-(6’’-O-acetylglucoside)-7-O-rhamnoside, Genkwanin 5-O-glucoside, Luteolin 5-O-(6’’-O-malonylglucoside), Kaempferol 3-O-(6’’-O-malonylglucoside), Kaempferol 3-O-rhamnoside, Quercetin, Genkwanin 4’-O-glucoside and Hyperoside.","PeriodicalId":12913,"journal":{"name":"Hemijska Industrija","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68380356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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