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CFD simulation of impeller shape effect on quality of mixing in two-phase gas–liquid agitated vessel

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Chinese Journal of Chemical Engineering 2020年第11期28卷 2733-2745页

作者： Amir Heidari Process Simulation and Modeling Laboratory(PSMlab) Faculty of ChemicalPetroleum and Gas EngineeringSemnan UniversitySemnan ***Iran

Mixing efficiency in two-phase gas–liquid agitated vessel is one of the important challenges in the industrial *** fluid dynamics technique(CFD)was used to investigate the effect of four different pitched blade impellers,including 15°,30°,45°and 60°,on the mixing quality of gas–liquid agitated *** multiphase flow behavior was modeled by Eulerian–Eulerian multiphase approach,and RNG k-εwas used to model the *** CFD results showed that a strong global vortex plays the main role on the mixing quality of the gas phase in the *** on the standard deviation criterion,it was observed that the axial distribution of the gas phase in the 30°impeller is about 55%better than the *** addition,the results showed that the 30°impeller has a uniform radial distribution over the other impellers and the maximum gas phase holdup in the *** of the power consumption of the impellers showed that the 30°impeller has the highest power consumption among the other pitched blade ***,examine the effect of same power condition for pitched blade impellers showed that the 30°impeller has the best mixing quality in this condition.

关键词： Pitched blade impeller Mixing CFD Multiphase flow RNG k-εmodel

An environmental friendly approach for the catalyst-free synthesis of highly substituted pyrazoles promoted by ultrasonic radiation

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Chinese Chemical Letters 2015年第11期26卷 1397-1399页

作者： Firouzeh Nemati Seyed Hasan Nikkhah Ali Elhampour Department of Chemistry Semnan University

A cost-effective, highly useful and eco-friendly procedure for the one-pot synthesis of highly substituted pyrazole derivatives has been developed via the reaction of various aldehydes, malononitrile and phenylhydrazine or 4-phenylthiosemicarbazide in PEG-400 and water at room temperature under ultrasound irradiation. Utilization of green solvents without a catalyst makes this methodology very interesting from economic and environmental perspectives. This method provides several advantages such as operational simplicity, use of accessible and economical starting materials and reduced environmental consequences.

关键词： Green chemistryMulticomponent reactionPyrazole Ultrasonic

Surfactant-assisted synthesis of bis(indolyl)methanes in water

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Chinese Chemical Letters 2011年第11期22卷 1305-1308页

作者： Eskandar Kolvari Mohammad Ali Zolfigol Hoda Banary Department of Chemistry Faculty of Science Semnan UniversitySemnanIran Faculty of Chemistry Bu-Ali Sina university HamedanIran

An environmentally friendly synthesis method for bis（indolyl）methanes has been developed in the presence of sodium lauryl ether sulfate（SLES）,electrophilic substitution reactions of indoles with aldehydes were acc... 详细信息

关键词： Sodium lauryl ether sulfate Bis(indolyl) methanes Indoles Aldehydes

A new approach for one-pot,green synthesis of new polycyclic indoles in aqueous solution

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Chinese Chemical Letters 2017年第5期28卷 1031-1034页

作者： Mohsen Ameri Alireza Asghari Ali Amoozadeh Mohammad Bakherad Department of Chemistry Semnan University College of Chemistry Shahrood University of Technology

Electro-oxidation of phenylamine derivatives（1a and 1b） have been studied in the presence of pyrazolidine-3,5-dione（3） as a nucleophile in phosphate buffer solution mixed with ethanol,using voltammetric and spectroscopic *** obtained results indicated that the oxidized form of phenylamines（2a and 2b） participate in Michael addition type reactions with pyrazolidine-3,5-dione（3） and via ECECCCCC mechanisms convert to the corresponding new polycyclic indoles（12a and 12b）.In the present study,new polycyclic indole derivatives were synthesized with good yields and high purity using a facile,one-pot and environmentally friendly electrochemical method,without any chemical catalysts,toxic solvents and hard conditions.

关键词： Electro-oxidation Phenylamine Polycyclic indoles Environmentally friendly ECECCCCC mechanism

功能化纳米碳管对水溶液中Pb2+吸附的动力学、平衡与等温线（英文）

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新型炭材料 2019年第6期34卷 512-523页

作者： Hamzeh Eyni Hasan Tahermansouri Farhoush Kiani Mansour Jahangiri Faculty of Nanotechnology Semnan UniversitySemnanIran Department of Chemistry Ayatollah Amoli BranchIslamic Azad UniversityAmolIran Faculty of Chemical&Petroleum and Gas Engineering Semnan UniversitySemnanIran

以3-Amino-5a,10a-dihydroxybenzo[b] indeno [2,l-d]furan-10-one (ADIF)功能化改性的纳米碳管(MWCNT-ADIF)为吸附剂,除去水溶液中的Pb^2+。采用FT-IR, SEM, TGA及DTG对MWCNT-ADIF样品进行表征。探讨了pH值、Pb^2+初始浓度、吸附量和接触时间对吸附动力学与平衡的影响。采用4种二参数模型(Langmuir、Freundlich、Tempkin与Dubinin-Radushkevich)和6种三参数模型(Redlich-Peterson, Khan, Sips, Radke-Prausnitz, Toth, Hil)研究Pb^2+吸附等温线。通过伪一阶动力学模型、伪二阶动力学模型和粒子内扩散模型分析吸附动力学。采用3种误差分析方法、相关系数、卡方值和平均相对误差来确定最佳拟合等温线和动力学模型。结果表明,吸附动力学与伪二阶动力学模型相吻合。误差分析表明,三参数模型比二参数模型更适合描述Pb^2+吸附数据。等温线数据与Langmuir、 Hill和Sips models相符。MWCNT-ADIF在pH=3溶液中能脱除92%的Pb^2+,并且回收后的MWCNT-ADIF能重复使用5个再生周期。

关键词：纳米碳管功能化铅等温线动力学