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Simulated moving bed separation of tocopherol homologues:simulation and experiments

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第5期10卷 758-766页

作者： Yu-bin lu Bao-gen SU Yi-wen YANG Qi-long REN Ping-dong WU National Laboratory of Secondary Resources Chemical Engineering Zhejiang University Hangzhou 310027 China Hangzhou Zhongmei Huadong Pharmaceutical Co. Ltd. Hangzhou 310011 China

Chromatograms of tocopherol homologues were obtained by a column of analytical size (inner diameter (ID) 0.46 cm cm×10 cm) packed with silica gel. Adsorption isotherms and film mass-transfer coefficient were estimated from the chroma-tograms by using a general rate model, which considers axial dispersion, external mass-transfer and intraparticle diffusion. Based on the obtained isotherms and mass-transfer coefficient, the separation process of tocopherol homologues on simulated moving bed (SMB) was simulated using the same model. According to the simulated results, a mixture of α-, γ-, δ-tocopherols and other impurities was separated on an SMB equipment. The SMB equipment was composed of 8 columns of ID 2 cm×10 cm, with 2 columns in each section. The solid phase was silica gel, and the mobile phase was n-hexane/2-propanol (99/1 by volume). γ-and δ-tocopherols of purity greater than 98% were obtained with recovery greater than 98%. The effects of operating conditions (flow rates and switching time) on the performance of SMB were studied by both simulation and experiments. It was found that all the simulation results were quite close to the experimental results. We conclude that process development and optimization of operating conditions of SMB by simulation are feasible.

关键词： Simulated moving bed (SMB) Separation Modeling Simulation Tocopherol homologues

Synthesis of Dimethyl Carbonate from Methanol and Carbon Dioxide Catalyzed by Potassium Hydroxide under Mild Conditions

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Chinese Chemical Letters 2005年第9期16卷 1267-1270页

作者： Hong WANG bin lu Qing Hai CAI Feng WU Yong Kui SHAN College of Chemical and Environmental Engineering Harbin University of Science and Technology Harbin 150080 Department of Chemistry Harbin Normal university Harbin 150080 Department of Chemistry East China Normal University Shanghai 200062

The synthesis of dimethyl carbonate （DMC） from methanol and carbon dioxide using potassium hydroxide as catalyst in the presence of CH3I and the effect of ionic liquid on the reaction were investigated. The results showed that KOH is an effective catalyst; the high selectivity and raised yield of DMC formation under mild conditions were achieved. However, the addition of the ionic liquid, l-ethyl-3-methylimidazolium bromide （emimBr）, can evidently accelerate the conversion of methanol and yield of the product.

关键词： Dimethyl carbonate methanol carbon dioxide methyl iodide ionic liquid l-ethyl-3-methylimidazolium bromide

Structural transformation from Waugh-type to Keggin-type polyoxomolybdate-based crystalline material for photo/electrocatalysis

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Rare Metals 2024年第5期43卷 2241-2250页

作者： Pei-Sen Wang Zi-Tong Wang Ya-Ya Tan Peng Chen Xue-Cheng Zhang lu-Nan Zhang Yong-Ge Wei lu-bin Ni School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China State Key Laboratory of Natural and Biomimetic Drugs Peking UniversityBeijing100191China

An inorganicDorganic hybrid crystalline material(SiMo_(12)O_(40))[Cu(2,2'-bipy)_(2)]_(2)·2H_(2)O(Complex 1,2,2'-bipy=2,2'-bipyridine)was synthesized for the first time by using 2,2'-bipy and transition metal copper to convert Waugh-type polyoxometalate[MnMo_(9)O_(3)_(2)]_(6-)into a Keggin polyoxometalate structure[SiMo_(12)O_(40)]^(4-)under hydrothermal conditions in glass *** crystal tests and a series of characterizations were carried out on Complex *** structure of Complex 1 is composed of[SiMo_(12)O_(40)]^(4-)and[Cu^(Ⅱ)(2,2'-bipy)_(2)]^(2+).The five-coordinated Cu is connected to two 2,2'-bipy through CuDN bonds,forming an approximately square ***,Complex 1 exhibited good photocatalytic performance for methylene blue degradation and electrocatalytic nitrite reduction properties simultaneously.

关键词： Polyoxometalates Inorganic-organic hybrid materials Photocatalytic Electrocatalytic

Recent Progress in Ferroelectric Diodes: Explorations in Switchable Diode Effect

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Nano-Micro Letters 2013年第2期5卷 81-87页

作者： Chen Ge Can Wang Kui-juan Jin Hui-bin lu Guo-zhen Yang Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences

Switchable diode effect in ferroelectric diodes has attracted much attention for its potential applications in novel nonvolatile memories. We briefly review recent investigations on the switchable diode effect in ferroelectric diodes both experimentally and theoretically. Many recent studies demonstrate that the interfacial barrier between the metal-ferroelectrics could be modulated by the polarization charges, and the ferroelectric polarization that can be reversed by an external electric field plays a dominant role in the switchable diode effect. Moreover, we review a self-consistent numerical model, which can well describe the switchable diode effect in ferroelectric diodes. Based on this model, it can be predicted that it is a better choice to select metals with a smaller permittivity, such as noble metals, to obtain a more pronounced switchable diode effect in ferroelectric diodes.

关键词： Ferroelectric diodes Switchable diode effect Metal/ferroelectrics/metal structure Self-consistent mode

Deoximation Reaction in Room Temperature Ionic Liquids under Mild Conditions

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Chinese Journal of Chemistry 2011年第9期29卷 1846-1850页

作者： Zhang, Xiaoxia lu, bin Wang, Xiaoguang Zhao, Jingxiang Cai, Qinghai Modern Experimental Center Key Lab for Design ＆ Synthesis of Functional＆ed Materials and Green Catalysis School of Chemistry and Chemical Engineering Harbin Normal University No. 1 Shida South Road Limin Development Zone Harbin Heilongjiang 150025 China

Deoximation in metal chloride ionic liquids based on 1-alkyl-3-methylimidazolium and triethylene ammonium cations, such as AmimBr（Cl）-MClx （A=ethyl, butyl, benzyl; M=Al, Fe, Cu, Sn and Zn; x=2, 3） and Et3NHCl-FeCl3 were investigated under mild conditions. Ferrate chloride ionic liquid was proved to be an effective catalyst for deoximation of cyclohexanone oxime, exhibiting high conversion of oximes and selectivity to cyclo- hexanone. Good performance for the deoximation of other oximes such as salicylald oxime, acetone oxime, benzo- phenone oxime, 4-nitrobenzald oxime, acetophenone oxime, 2-chlorobenzaldehyde oxime, Acetald oxime, 2-butanone oxime and （1R）-camphor oxime was also achieved with bmimBr-FeCl3 as catalyst and solvent. The de- oximation was determined to carry out via acid-catalytic hydrolysis and the reaction mechanism was proposed.

关键词： deoximation oxime ionic liquids solvent-free

Muscovite is protective against non-steroidal anti-inflammatory drug-induced small bowel injury

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World Journal of Gastroenterology 2014年第31期20卷 11012-11018页

作者： Chen Huang bin lu Yi-Hong Fan lu Zhang Ning Jiang Shuo Zhang Li-Na Meng Department of Gastroenterology The First Affiliated Hospital of Zhejiang Chinese Medical University

AIM: To evaluate the effect of muscovite in preventing small bowel injury induced by nonsteroidal anti-inflammatory drugs (NSAIDs).

关键词： Muscovite Nonsteroidal anti-inflammatory drugs Small intestinal injury Video capsule endoscopy

Van der Waals heterostructure engineering by 2D space-confinement for advanced potassium-ion storage

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Nano Research 2021年第11期14卷 3854-3863页

作者： Bi luo Peng Wu Jiafeng Zhang Liang Cao Chunhui Wang bin lu Bao Zhang Xing Ou National Engineering Laboratory for High Efficiency Recovery of Refractory Nonferrous Metals School of Metallurgy and EnvironmentCentral South UniversityChangsha410083China Key Laboratory on Fuel Cell Technology of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou510641China Institute of Advanced Magnetic Materials College of Materials&Environmental EngineeringHangzhou Dianzi UniversityHangzhou310018China

Molybdenum disulfide (MoS_(2)) has received enormous attentions in the electrochemical energy storage due to its unique two-dimensional layered structure and relatively high reversible capacity. However, the application of MoS_(2) in potassium-ion batteries (PIBs) is restricted by poor rate capability and cyclability, which are associated with the sluggish reaction kinetics and the huge volume expansion during K+ intercalation. Herein, we propose a two-dimensional (2D) space confined strategy to construct van der Waals heterostructure for superior PIB anode, in which the MoS_(2) nanosheets can be well dispersed on reduced graphene oxide nanosheets by leveraging the confinement effect within the graphene layers and amorphous carbon. The strong synergistic effects in 2D van der Waals heterostructure can extremely promote the electron transportation and ions diffusion during K+ insertion/extraction. More significantly, the 2D space-confinement effect and van der Waals force inhibit polysulfide conversion product dissolution into the electrolyte, which significantly strengthens the structural durability during the long-term cycling process. As anticipated, the as-synthesized the “face-to-face” C/MoS_(2)/G anode delivers remarkable K-storage performance, especially for high reversible capacity (362.5 mAh·g^(-1) at 0.1 A·g^(-1)), excellent rate capability (195.4 mAh·g^(-1) at 10 Ag^(-1)) and superior ultrahigh-rate long-cycling stability (126.4 mAh·g^(-1) after 4000 cycles at high rate of 5 A·g^(-1)). This work presents a promise strategy of structure designing and composition optimization for 2D layered materials in advanced energy storage application.

关键词： van der Waals heterostructure space confinement molybdenum disulfide anode materials potassium-ion batteries

A Simple Polyoxometallate for Selective Oxidation of Benzyl Alcohol to Benzaldehyde with Hydrogen Peroxide

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Chinese Journal of Chemistry 2012年第2期30卷 433-437页

作者： Tian,Wei Hou,Yang Wang,Xiaoguang lu,bin Zhao,Jingxiang Cai,Qinghai Key Lab for Design&Synthesis of Functionalized Materials and Green Catalysis School of Chemistry and Chemical EngineeringHarbin Normal UniversityHarbinHeilongjiang 150025China

A series of Keggin-type polyoxometallates, M3（PW12O40）2 [M = Ni, Zn, Co, Mn, Cu], FePW12O40, Ni3（PMo12O40）2 and Ni2SiWl2040, were prepared and used as catalysts for selective oxidation of benzyl alcohol into benzaldehyde with H202 as an oxidant under solvent-free condition. Ni3（PW12040）2·26H2O afforded high catalytic activity with TON of 550.6 mol/（mol cat.） and 87.3% selectivity. However, this catalyst can be easily recovered and reused.

关键词： benzyl alcohol benzaldehyde polyoxometallates hydrogen peroxide

Extinction of Weak Solutions for Nonlinear Parabolic Equations with Nonstandard Growth Conditions

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Communications in Mathematical Research 2012年第4期28卷 376-382页

作者： GAO JING-lu Guo bin School of Mathematics Jilin University Changchun 130012

This paper deals with the extinction of weak solutions of the initial and boundary value problem for ut = div（（｜u｜σ ＋ d0）｜ u｜^p（x）-2 u）. When the exponent belongs to different intervals, the solution has ... 详细信息

关键词： nonlinear parabolic equation nonstandard growth condition p(x)-Laplacian operator