Chemical Industry最新文献_第10页

Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study 三乙醇胺作为草催化葵花籽油醇解生产生物柴油的高效助溶剂的优化研究

Chemical Industry Pub Date : 2019-12-29 DOI: 10.2298/hemind190822033d

Dusica Djokic-Stojanovic, Z. Todorović, Dragan Z. Troter, Olivera S. Stamenković, Ljiljana Veselinović, M. Zdujić, D. Manojlović, V. Veljković

{"title":"Triethanolamine as an efficient cosolvent for biodiesel production by CaO-catalyzed sunflower oil ethanolysis: An optimization study","authors":"Dusica Djokic-Stojanovic, Z. Todorović, Dragan Z. Troter, Olivera S. Stamenković, Ljiljana Veselinović, M. Zdujić, D. Manojlović, V. Veljković","doi":"10.2298/hemind190822033d","DOIUrl":"https://doi.org/10.2298/hemind190822033d","url":null,"abstract":"Triethanolamine was applied as an efficient ?green? cosolvent for biodiesel production by CaO-catalyzed ethanolysis of sunflower oil. The reaction was conducted in a batch stirred reactor and optimized with respect to the reaction temperature (61.6-78.4?C), the ethanol-to-oil molar ratio (7:1-17:1) and the cosolvent loading (3-36 % of the oil weight) by using a rotatable central composite design (RCCD) combined with the response surface methodology (RSM). The optimal reaction conditions were found to be: the ethanol-to-oil molar ratio of 9:1, the reaction temperature of 75?C and the cosolvent loading of 30 % to oil weight, which resulted in the predicted and actual fatty acid ethyl ester (FAEE) contents of 98.8 % and 97.9?1.3 %, respectively, achieved within only 20 min of the reaction. Also, high FAEE contents were obtained with expired sunflower oil, hempseed oil and waste lard. X-ray diffraction analysis (XRD) was used to understand the changes in the CaO phase. The CaO catalyst can be used without any treatment in two consecutive cycles. Due to the calcium leaching into the product, an additional purification stage must be included in the overall process.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76437179","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}

引用次数: 3

Effects of the polymer molecular weight and type of cation on phase diagrams of polythylene glycol + sulfate salts aqueous two-phase systems 聚合物分子量和阳离子类型对聚乙二醇+硫酸盐双水相体系相图的影响

Chemical Industry Pub Date : 2019-12-29 DOI: 10.2298/hemind191003035p

Gholamhossein Parmoon, A. M. Nafchi, M. Pirdashti

引用次数: 1

Physico-chemical and biological properties of dental calcium silicate cements - literature review 牙科硅酸钙胶结物的物理化学和生物学特性-文献综述

Chemical Industry Pub Date : 2019-11-14 DOI: 10.2298/hemind190614027i

D. Ilić, Djordje Antonijević, V. Biočanin, B. Čolović, V. Danilovic, V. Komlev, A. Teterina, V. Jokanović

{"title":"Physico-chemical and biological properties of dental calcium silicate cements - literature review","authors":"D. Ilić, Djordje Antonijević, V. Biočanin, B. Čolović, V. Danilovic, V. Komlev, A. Teterina, V. Jokanović","doi":"10.2298/hemind190614027i","DOIUrl":"https://doi.org/10.2298/hemind190614027i","url":null,"abstract":"Dental cement materials have been developed with the aim to replace hard\u0000 dental tissues. The first material used for pulp capping, root canal\u0000 obturation, bifurcation perforation and apexification is calcium hydroxide\u0000 (in 1920). A half century later, glass-ionomer cements began to suppress it\u0000 as dentine substitutes. Finally, in the 1990s, calcium silicate (CS)\u0000 material appeared in the dental research community as the most promising\u0000 dentine substitute capable to adequately meet all clinical requirements. The\u0000 aim of this paper is to present an overview of literature related to studies\u0000 about CS materials taking into account their physical, chemical and\u0000 biological properties and clinical applications. This review aims to discuss\u0000 beneficial and adverse characteristics of CSs concerning interactions to the\u0000 hard dentine and soft pulp/periodontal tissues. This review article deals\u0000 with the literature data about currently commercially available CS\u0000 concerning laboratory and clinical findings. 109 scientific articles were\u0000 analyzed of which 62 references reported in vitro and 26 in vivo\u0000 investigations while 21 references comprised reports, reviews and books\u0000 dealing with both, in vitro and in vivo investigations. Although further\u0000 data collection is necessary, CSs are promising materials that represent a\u0000 gold standard for numerous dental clinical procedures.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89910202","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}

引用次数: 2

The wet high intensity magnetic separation of magnesite ore waste 菱镁矿废石的湿式强磁选

Chemical Industry Pub Date : 2019-11-14 DOI: 10.2298/hemind181010026a

A. Atasoy

引用次数: 1

Is there a need for systematic education on peer-reviewing in Serbia? 塞尔维亚是否需要对同行评议进行系统的教育?

Chemical Industry Pub Date : 2019-11-14 DOI: 10.2298/hemind191020029d

Ivana T. Drvenica, A. Dekanski, Nevena Budjevac, Ivan Umeljic, O. Nedić

引用次数: 0

Immobilization of Chaga extract in alginate beads for modified release: Simplicity meets efficiency 藻酸酯微球固定化Chaga提取物的研究:简单高效

Chemical Industry Pub Date : 2019-11-14 DOI: 10.2298/hemind190819028p

P. Petrović, K. Ivanović, Charly Octrue, M. Tumara, A. Jovanović, Jovana Vunduk, M. Nikšić, R. Pjanovic, B. Bugarski, A. Klaus

{"title":"Immobilization of Chaga extract in alginate beads for modified release: Simplicity meets efficiency","authors":"P. Petrović, K. Ivanović, Charly Octrue, M. Tumara, A. Jovanović, Jovana Vunduk, M. Nikšić, R. Pjanovic, B. Bugarski, A. Klaus","doi":"10.2298/hemind190819028p","DOIUrl":"https://doi.org/10.2298/hemind190819028p","url":null,"abstract":"Chaga (Inonotus obliquus) is a parasitic fungus, which has been used in traditional medicine in Russia and other northern European countries in the treatment of cancer, gastrointestinal andliver diseases. It has been a subject of intensive researchrecently, confirming many of its health-beneficial effects. In order to obtain a product that would allow modified and prolonged release of the Chaga?s active metabolites, hot water Chaga extract was immobilized using calcium - alginate. The extract, which was predominantly composed of carbohydrates (57 %), also contained a relatively high amount of antioxidants/phenolic compounds (130 mg gallic acid equivalents per g of dry extract) and exhibited pronounced radical scavenging activity. It showed significant antibacterial activity as well, inhibiting growth of tested bacterial strains at concentrations of 1.25-20 mg/mL. Entrapment efficiency was about 80 %, and the extract-alginate system showed pH-dependant extract release; there was negligible release at pH 1.75 (gastric pH), and the release gradually increased with the increase in pH, reaching ~43 % of immobilized extract at pH 8.5 after 90 min. Such a product could be used as a dietary supplement, adjuvant in therapy of gastrointestinal diseases or as a food additive.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85451623","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}

引用次数: 2

Decay of the melt stream during dispersion in granulation devices 在造粒装置中分散时熔体流的衰减

Chemical Industry Pub Date : 2019-11-14 DOI: 10.2298/hemind190422025s

V. Sklabinskiy, A. Artyukhov, M. Kononenko, J. Krmela

{"title":"Decay of the melt stream during dispersion in granulation devices","authors":"V. Sklabinskiy, A. Artyukhov, M. Kononenko, J. Krmela","doi":"10.2298/hemind190422025s","DOIUrl":"https://doi.org/10.2298/hemind190422025s","url":null,"abstract":"The aim of the article is a theoretical description and experimental study of the melt jet expiration process from a perforated shell of a vibrating granulator. Mathematical modeling of hydrodynamic flows was carried out based on the points of classical fluid and gas mechanics and technical hydromechanics. Reliability of the obtained experimental results is based on the application of time-tested in practice methods. Hydrodynamic properties of the liquid jet outflow were obtained. The presented mathematical model allows calculation of the radial component of the jet outflow velocity, as well as determination of the influences of physical and chemical properties of the liquid and the outflow hole diameter on the jet length and flow velocity along the axis to its disintegration into separated drops. The developed mathematical model extended with the theoretical description of the melt dispersion process from rotating perforated shells allowed us to improve design of the granulator to stabilize hydrodynamic parameters of the melt movement. The nitrogen fertilizers melt disperser was investigated regarding industrial-scale production and operating parameters of the process of jet decay into drops, drop size and monodispersity level were optimized.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86339123","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}

引用次数: 0

High efficiency disperse dryer - an innovative process for drying of solutions, suspensions and pastes in a fluidized bed of inert particles 高效分散干燥机-一个创新的过程，干燥的溶液，悬浮液和糊状在流化床的惰性颗粒

Chemical Industry Pub Date : 2019-09-02 DOI: 10.2298/hemind190626021d

M. Djuris, T. Kaludjerovic-Radoicic, Darko Jacimovski, Z. Arsenijević

引用次数: 0

Temperature changes in the pulp chamber induced by polymerization of resin-based dental restoratives following simulated direct pulp capping 模拟直接盖牙后树脂基牙修复体聚合引起的牙髓腔温度变化

Chemical Industry Pub Date : 2019-09-02 DOI: 10.2298/HEMIND190504020P

Violeta Petrovic, Jovana N Stašić, Vojislav Komlenic, Tatjana Savić-Stanković, M. Latkovic, V. Miletic

{"title":"Temperature changes in the pulp chamber induced by polymerization of resin-based dental restoratives following simulated direct pulp capping","authors":"Violeta Petrovic, Jovana N Stašić, Vojislav Komlenic, Tatjana Savić-Stanković, M. Latkovic, V. Miletic","doi":"10.2298/HEMIND190504020P","DOIUrl":"https://doi.org/10.2298/HEMIND190504020P","url":null,"abstract":"The objective of this study was to measure temperature changes in the pulp chamber induced by polymerization of resin-based dental restoratives following a simulated procedure of direct pulp capping. Class I cavities with a microperforation at the pulp horn were prepared in extracted human molar teeth. The complete procedure of direct pulp capping and cavity restoration was performed with the root part of extracted teeth fixed in a water bath at 37 ?C. Mineral trioxide aggregate, bioactive dentin substitute or calcium-hydroxide paste were used as pulp capping materials. Cavities were restored with a light-cured or chemically-cured resin-modified glass ionomer, universal adhesive and a bulk-fill composite, cured with a high-intensity LED unit. Pulp capping materials caused a slight temperature decrease. Lower temperature increase was recorded during light-curing of the glass ionomer liner after direct capping with mineral trioxide aggregate and calcium-hydroxide than that recorded for the bioactive dentin substitute. Adhesive light-curing increased temperature in all groups with higher mean temperatures in groups with chemically-cured as compared to those for the light-cured glass ionomer liner. Direct pulp capping with mineral trioxide aggregate or calcium-hydroxide followed by the light-cured resin-modified glass ionomer liner and a bonded bulk-fill composite restoration induced temperature changes below the potentially adverse threshold of 42.5?C.","PeriodicalId":9933,"journal":{"name":"Chemical Industry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82258175","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}

引用次数: 1

Innovation competitions - means to generate valuable ideas, advance products and technologies, and enhance entrepreneurial skills 创新竞赛-产生有价值的想法，推动产品和技术，提高创业技能

Chemical Industry Pub Date : 2019-09-02 DOI: 10.2298/hemind190824024o

B. Obradovic

引用次数: 0