Revista de Chimie最新文献_第8页

Review. Some People and Places Important in the History of Analytical Chemistry in Romania 审查。罗马尼亚分析化学史上重要的人物和地点

Revista de Chimie Pub Date : 2021-05-07 DOI: 10.37358/RC.21.2.8427

Raluca-Ioana Stefan-van Staden, Victor David, D. Burns

引用次数: 0

Characterization and Antibacterial Activity of Silver Nanoparticles Biosynthesized Using Leaves Extract of Artemisia sieberi and Calotropis procera 细叶蒿和牛角蒿叶提取物生物合成纳米银的表征及抗菌活性研究

Revista de Chimie Pub Date : 2021-05-07 DOI: 10.37358/RC.21.2.8421

S. Salmen, Nadiah Matluq Alkammash, T. Alahmadi, S. Alharbi

引用次数: 1

Case Study Regarding the Variation of the Qualitative Parameters of Wastewater 关于废水质量参数变化的案例研究

Revista de Chimie Pub Date : 2021-05-07 DOI: 10.37358/RC.21.2.8414

A. R. Iova, C. Neagu, D. Cretu

引用次数: 1

Biodiesel Fuel from Waste Cooking Oil: A Cheaper and Cleaner Renewable Energy Source 从废弃食用油中提取生物柴油:一种更便宜、更清洁的可再生能源

Revista de Chimie Pub Date : 2021-05-07 DOI: 10.37358/RC.21.2.8430

Riham Kanaan, Elissar Al-Aawar, Bassam Riachi, Salim Nassreddine, D. Cursaru, J. Chamoun

{"title":"Biodiesel Fuel from Waste Cooking Oil: A Cheaper and Cleaner Renewable Energy Source","authors":"Riham Kanaan, Elissar Al-Aawar, Bassam Riachi, Salim Nassreddine, D. Cursaru, J. Chamoun","doi":"10.37358/RC.21.2.8430","DOIUrl":"https://doi.org/10.37358/RC.21.2.8430","url":null,"abstract":"Low cost, high fatty acid content waste cooking oil was transformed into biodiesel using an acid catalyzed chemical esterification reaction with 0.5 vol.% of H2SO4 at 60°C for 1h followed by the main transesterification reaction. For the purpose of comparison, biodiesel fuel was also prepared using straight vegetable oils (SVO’s). The gas chromatography test showed higher than 95% FAME (fatty acid methyl ester) content for different types of utilized feedstocks. Biodiesel fuel and its blends were characterized based on ASTM test methods to investigate its density, viscosity, flash point, pour point, heating value, and its cetane index and similar physical properties were obtained for all the prepared biodiesel fuels. B20 blend, which contains 20 vol.% of biodiesel and 80 vol.% of diesel, showed a better performance than B0 (100 vol.% of diesel) when tested in a laboratory compression ignition diesel engine. After simulation of the production process via Aspen Hysys, a feasibility study was conducted and the results revealed that utilizing waste cooking oils (WCO’s) as feedstock is more economical than starting with SVO’s as raw material.","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"35 1","pages":"186-199"},"PeriodicalIF":0.0,"publicationDate":"2021-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88168022","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

Research Concerning the Influence of Balancing the Conventional Pumping Units on their Dynamics 常规抽油机平衡对其动力学影响的研究

Revista de Chimie Pub Date : 2021-05-07 DOI: 10.37358/RC.21.2.8429

D. Bădoiu

引用次数: 0

Efficiency Evaluation of Anti-corrosion Treatment of Carbon Steel by Extracts of Red Algae Collected from Mediterranean Coast 地中海沿岸红藻提取物对碳钢防腐效果评价

Revista de Chimie Pub Date : 2021-05-07 DOI: 10.37358/RC.21.2.8420

Faiza Khoukhi, S. Kebbouche-Gana, N. Djelali, M. Gana, Rabah Boukhalfa, Tamazouzt Ait Hamouda, Ahlam Loufar

{"title":"Efficiency Evaluation of Anti-corrosion Treatment of Carbon Steel by Extracts of Red Algae Collected from Mediterranean Coast","authors":"Faiza Khoukhi, S. Kebbouche-Gana, N. Djelali, M. Gana, Rabah Boukhalfa, Tamazouzt Ait Hamouda, Ahlam Loufar","doi":"10.37358/RC.21.2.8420","DOIUrl":"https://doi.org/10.37358/RC.21.2.8420","url":null,"abstract":"The paper presents the assessment of inhibition effectiveness of biomolecules extracted from red seaweed against biocorrosion in the petroleum industry. The first objective of this study was to obtain extracts (A, B and C, prepared respectively from red algae species: Corallina ellongata, Gymnogongrus crenulatus and Pterocladia capillacea) by ethanol extraction method. The infrared spectra of the three extracts confirmed the presence of amine derivatives molecules known by their anticorrosion inhibiting powers. The second objective was based on the identification of physico-chemical characteristics of the extracts and thus revealing their inhibitory and / or bactericidal power in bacterial corrosion of carbon steel in injection water contaminated with sulfato-reducing bacteria. Biological test of all extracts gave a concentration upto 10 germs/mL in contaminated water by sulfato-reducing bacteria during 28 days of incubation at 37°C. Evolution in time of the open-circuit potential showed a longer incubation time for electrolyte with extracts, whereas the stabilization time was shorter. Current corrosion density, polarization resistance, charge transfer resistance and double layer capacity were determined by using linear polarizarion resistance technique and electrochemical impedance spectroscopy. The corrosion protection efficiency of extract obtained from Gymnogongrus crenulatus (extract B) reached a maximum protective capacity of 99.69% at 5 ppm in the injection water.","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"21 1","pages":"59-75"},"PeriodicalIF":0.0,"publicationDate":"2021-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83954917","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

Experimental and Theoretical Study on Cyanuric Chloride Derivatives as Corrosion Inhibitors for Oxyen Corrosion of Mild Steel in High Salinity Corrosive Medium 三聚氰胺衍生物在高盐腐蚀介质中作为低碳钢氧腐蚀缓蚀剂的实验与理论研究

Revista de Chimie Pub Date : 2021-05-07 DOI: 10.37358/RC.21.2.8425

Jincheng Mao, Han Difei, Jinzhou Zhao, Xiaojiang Yang, Chon Lin, Heng Zhang

引用次数: 0

Trifluoroacetylation of Alcohols During NMR Study of Compounds with Bicyclo[2.2.1]heptane, Oxabicyclo[3.3.0]octane and Bicyclo[3.3.0]octane Skeleton 双环[2.2.1]庚烷、恶比环[3.3.0]辛烷和双环[3.3.0]辛烷骨架化合物核磁共振研究中醇类的三氟乙酰化

Revista de Chimie Pub Date : 2021-05-07 DOI: 10.37358/RC.21.2.8428

C. Tănase, A. Hanganu, C. Draghici

{"title":"Trifluoroacetylation of Alcohols During NMR Study of Compounds with Bicyclo[2.2.1]heptane, Oxabicyclo[3.3.0]octane and Bicyclo[3.3.0]octane Skeleton","authors":"C. Tănase, A. Hanganu, C. Draghici","doi":"10.37358/RC.21.2.8428","DOIUrl":"https://doi.org/10.37358/RC.21.2.8428","url":null,"abstract":"TFA was added to a solution of a bicyclo[2.2.1]heptane azide-alcohol in CDCl3 to correctly characterize the compound, but during 24 h gave the trifluoro acetylated compound in quantitative yield. NMR spectra of the esterified compound helped us also to correctly attribute the NMR signals to the protons, and also confirmed the identification of the carbon atoms. The study was extended to other 14 compounds containing a primary alcohol group alone or with an ethylene ketal, a δor -lactone group, a primary and a secondary group, two primary and an alkene group and two primary and a secondary alcohol groups on scaffolds containing bicyclo[2.2.1]heptane, oxabicyclo[3.3.0]octane, bicyclo [2.2.1]heptane constrained with a cyclopropane ring and bicyclo[3.3.0]octane fragments. The esterification of all compounds was also quantitative in 24 to 72 h; this helped us to correct attribute the NMR signals to the protons and carbon atoms of the un-esterified compounds by comparison with those of the trifluoro acetylated compounds. A graphical presentation of Hand C-NMR spectra of a few un-esterified and esterified compounds are presented in the paper.","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"55 1","pages":"156-177"},"PeriodicalIF":0.0,"publicationDate":"2021-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87004502","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

In memoriam Eli Ruckenstein 为了纪念伊莱·洛克斯坦

Revista de Chimie Pub Date : 2021-05-07 DOI: 10.37358/RC.21.2.8413

Alexandre C. Dimian

引用次数: 0

Effect of Salinization by NaCl on the Growth of African Palm (Elaeis guineensis Jacq) NaCl盐碱化对非洲棕榈生长的影响

Revista de Chimie Pub Date : 2021-05-07 DOI: 10.37358/RC.21.2.8422

L. Alemán, E. Combatt, A. Arrieta

{"title":"Effect of Salinization by NaCl on the Growth of African Palm (Elaeis guineensis Jacq)","authors":"L. Alemán, E. Combatt, A. Arrieta","doi":"10.37358/RC.21.2.8422","DOIUrl":"https://doi.org/10.37358/RC.21.2.8422","url":null,"abstract":"It is necessary to know the effect of excessive salinity in the soil on the growth of the African palm crop. The objective of the work was to evaluate the effect of salinity caused by NaCl on the growth and absorption of nutrients in the oil palm crop in early growth stage. The research was carried out in the laboratories of the University of Córdoba, where the 16 kg experimental units were made up of a mixture of alluvium and rice husk in a ratio of 4: 1. A complete randomized design was used with six treatments and a control (0.0, 0.5, 1.0, 1.5, 2.5, 3.6, and 6.1 cmolc kg Na) and four repetitions. The data were statistically analyzed by analysis of variance and regression. The results report that the salinity in the soil that originates with the application of 2.5 cmolc kg of Na produces in the soil an electrical conductivity (EC) of 1.96 dS m. Consequently, a drastic reduction in the quantified biomass of dry mass of stem, leaf, roots, rachis and leaf area originates, and the models that express this trend were adjusted to decreasing linear regressions with their highly significant parameters. Salinity interferes with the absorption of nutritional elements, such as N, K and Mg, and foliar nitrogen is the nutrient with the highest sensitivity to variations in EC in the soil. Foliar phosphorus (P) and calcium (Ca) concentrations were not affected by salinity levels.","PeriodicalId":21296,"journal":{"name":"Revista de Chimie","volume":"4 1","pages":"83-93"},"PeriodicalIF":0.0,"publicationDate":"2021-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86395038","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