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Chinese Journal of Chemical Engineering 2024年第2期66卷 110-118页

作者： Sheng Wan Rong Xie Jianhong Fan kewen tang Department of Chemistry and Chemical Engineering Hunan Institute of Science and TechnologyYueyang 414006China

Gold(Au)and palladium(Pd)play an increasing role in the production and human life;Therefore,it is of great significance to study their recovery.A 5,11,17,23-tetra-ethylthio-25,26,27,28-tetra-hydroxyl thiacalix[4]arene(TCAET)was synthesized specifically for the capture of Au(Ⅲ)and Pd(Ⅱ)from HCl medium by liquid-liquid *** a 0.1 mol·L^(-1)HCl medium,the transfer of Au(Ⅲ)and Pd(Ⅱ)from the aqueous phase to the organic phase was highly efficient,with a transfer ratio of 100%for Au(Ⅲ)and 98%for Pd(Ⅱ).Furthermore,the extraction equilibrium time for Au(Ⅲ)was just 5 ***'s method data demonstrated that TCAET formed complexes with Au(Ⅲ)and Pd(Ⅱ)in a ratio of 2:3 and 1:1,respectively,during the extraction *** showed high selectivity toward Pd(Ⅱ)and Au(Ⅲ)over other competing metal ***,both Au(Ⅲ)and Pd(Ⅱ)could be successfully stripped from the loaded organic phases with a 1.0 mol·L^(-1)thiourea in 0.5 mol·L^(-1)HCl and 0.5 mol·L^(-1)thiourea in 0.5 mol·L^(-1)HCl,*** obtained from five consecutive extraction-stripping cycles showed good reusability of TCAET toward Au(Ⅲ)and Pd(Ⅱ)*** conclusion can provide a certain reference for thiacalixarene in the recovery of precious metal species.

关键词： Thiacalixarene Upper-rim modification Liquid-liquid extraction Precious metal Thioether

Upper-rim-modifi ed thioether thiacalix[4]arene used for liquid – liquid extraction of Au(III) and Pd(II) in hydrochloric acid medium

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Enantioselective esterification of(R,S)-2-(4-methylphenyl)propionic acid via Novozym 435:Optimization and application

中国化学工程学报（英文版） 2024年第2期 110页

作者： Sheng Wan Rong Xie Jianhong Fan kewen tang

来源：博看期刊评论

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1816-1823页

作者： Xin Yuan LujunWang Panliang Zhang Weifeng Xu kewen tang Department of Chemistry and Chemical Engineering Hunan Institute of Science and TechnologyYueyang 414006China

This paper reports on the resolution of(R,S)-2-(4-methylphenyl)propionic acid(MPPA)enantiomers by enzymatic esterification in organic *** 435(CALB)has the best catalytic performance compared with other *** the alcohols screened,n-hexanol is the best acyl acceptor and gives the highest enzyme activity and enantioselectivity in *** surface methodology(RSM)was used to evaluate the influence of the factors,such as temperature,enzyme amount,substrate concentration and reaction time on the substrate conversion(c)and enantiomeric excess(ee).The correlation coefficient R2 for enantiomeric excess and the conversion are 0.9827 and 0.9910,respectively,indicating that can accurately predict the experimental *** simulation and optimization,the optimal conditions were obtained,involving 600 mmol·L^-1 MPPA concentration(0.60 mmol),850 mmol·L^-1 hexanol concentration(0.85 mmol),58 mg enzyme amount,75℃temperature and 4.5 h reaction time,*** the optimized conditions,the experimental values of conversion and enantiomeric excess were 89.34%and 97.84%,respectively,which are in good agreement with the model predictions.

关键词： (R,S)-2-(4-Methylphenyl)propionic acid Novozym 435 Esterification kinetic resolution Response surface methodology

Kinetic study on reactive extraction for chiral separation of phenylsuccinic acid enantiomers

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Science China Chemistry 2010年第11期53卷 2399-2406页

作者： tang kewen MIAO JiaBing ZHOU Tao SONG LiTao Department of Chemistry and Chemical Engineering Hunan Institute of Science and TechnologyYueyang 414006China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

The kinetics of the extraction of phenylsuccinic acid(PSA) enantiomers by hydroxypropyl-β-cyclodextrin(HP-β-CD) in a modified Lewis cell was studied,in which HP-β-CD dissolved in 0.1 mol L-1 NaH2PO4/H3PO4 buffer solution(pH = 2.5) was selected as the chiral *** enantiomers were extracted from organic phase to aqueous phase in the extraction *** theory of extraction accompanied by a chemical reaction has been used to obtain the intrinsic kinetics of this extraction *** different parameters affecting the extraction rate such as agitation speed,interfacial area,initial concentration of PSA enantiomers in organic phase as well as HP-β-CD concentration in aqueous phase were separately *** experimental results demonstrate that the extraction reactions are *** reactions were found to be first order with respect to PSA and second order with respect to HP-β-CD with forward rate constants of 3.4 × 10-2 m6 mol-2 s-1 for R-PSA and 9.96 × 10?3 m6 mol-2 s-1 for *** data will be useful in the design of extraction processes.

关键词： kinetics reactive extraction chiral separation Lewis cell phenylsuccinic acid enantiomers

Modeling multiple chemical equilibrium for reactive extraction of naproxen enantiomers with HP-β-CD as hydrophilic selector

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Science China Chemistry 2011年第7期54卷 1130-1137页

作者： tang kewen ZHANG PanLiang PAN ChunYue LI HongJian Department of Chemistry and Chemical Engineering Hunan Institute of Science and Technology Yueyang 414006 China College of Chemistry and Chemical Engineering Central South University Changsha 410083 China

Reactive extraction is an emerging technology for large-scale continuous resolution of drug enantiomers. The enantioselective extraction of R,S-naproxen by hydrophilic HP-β-CD in 1,2-dichloroethane was studied at 5℃. The experimental data were described by a reactive extraction model with a homogeneous aqueous phase reaction of R,S-naproxen with HP-β-CD which couples a complete description of chemical equilibria in aqueous phase with the overall phase equilibria of the system. Important parameters of this model were determined experimentally. The physical distribution coefficients for molecular and ionic NAP were 0.041 and 1.730, respectively. Here we show that the efficiency of extraction depends strongly on two process variables including pH and HP-β-CD concentration. The model predictions are compared graphically with the results of pre- vious experiments and there is a good agreement between each other. By the use of modeling and experiment, an optimized extraction condition with pH of 2.5 and HP-β-CD concentration of 0.1 mol/L was obtained with high enantioselectivity （a） of 1.59 and performance factor （pf） of 0,049. The model gives a good means of predicting enantiomers partitioning over a range of experimental conditions.

关键词： reactive extraction chiral separation naproxen enantiomers modelling hydroxypropyl-βcyclodextrin

Equilibrium of liquid-liquid extraction of 2-phenylbutyric acid enantiomers: Experiment and model

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Chinese Journal of Chemical Engineering 2018年第4期26卷 708-714页

作者： Weifeng Xu Guilin Dai kewen tang Panliang Zhang Biquan Xiong Yu Liu Department of Chemistry and Chemical Engineering Hunan Institute of Science and Technology

The utilization of liquid–liquid extraction for the separation of 2-phenylbutyric acid（2-PBA） enantiomers was proposed. Factors affecting the extract process were investigated, including organic solvents, β-cyclodextrin derivatives, cyclodextrin concentration, p H and temperature. A model was proposed to describe the separation process based on the homogeneous phase reaction mechanism. Important parameters of this model were determined experimentally. The physical distribution coefficients for molecular and ionic 2-PBA were0.129 and 7.455, respectively. The equilibrium constants of the complexation reactions were 89.36 and36.78 L·mol^-1 for（＋）-and（-）-2-PBA, respectively. The model was verified by experiments and proved to be an excellent means to optimize the separation system. Through modeling prediction and experiment, the best conditions（e.g., pH value of 3.00, extractant concentration of 0.1 mol·L^-1, temperature of 5.0 ℃） were acquired. Under this condition, the maximum enantioselectivity（2.096） was obtained.

关键词： Model Simulation Enantioselective extraction 2-Phenylbutyric acid Hydrophilic selector

Study on extraction kinetics ofα-cyclopentylmandelic acid enantiomers with hydroxyethyl-β-cyclodextrin as chiral selector

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Chinese Journal of Chemical Engineering 2018年第1期26卷 67-72页

作者： Panliang Zhang Pan Jiang Weifeng Xu Yu Liu Biquan Xiong Yunren Qiu kewen tang Department of Chemistry and Chemical Engineering Hunan Institute of Science and TechnologyYueyang 414006China School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China College of Chemical Engineering Xiangtan UniversityXiangtan 411105China

In this work,the kinetic study on reactive extraction ofα-cyclopentylmandelic acid(α-CPMA)enantiomers was performed in a Lewis cell using hydroxyethyl-β-cyclodextrin(HE-β-CD)as chiral *** enantioselective complexation equilibrium between HE-β-CD andα-CPMA enantiomers was studied by phase solubility *** important process parameters affecting the initial extraction rate were separately studied and the reaction rate equations were *** optimal conditions for kinetic study were as follows:stirring speed of 75 r·min^(-1),interfacial area of 12.56 cm^2,pH of 2.5,initial HE-β-CD concentration of 0.05 mol·L^(-1),initialα-CPMA concentration of 5 mmol·L^(-1),and temperature of 278 *** reaction has been found to be first order inα-CPMA and second order in HE-β-CD with the forward rate constants of 2.056×10^(-3)m^6·mol^(-2)·s^(-1)and 1.459×10^(-3)m^6·mol^(-2)·s^(-1)for(S)-α-CPMA and(R)-α-CPMA,*** complexation equilibrium constants were evaluated as 61 L·mol^(-1) and 117 L·mol^(-1)for(S)-α-CPMA and(R)-α-CPMA,and the intrinsic enantioselectivity is estimated as 1.92.

关键词： Kinetics Liquid-liquid extraction Chiral resolution α-Cyclopentylmandelic acid

“十四五”规划下地方应用型高校化工专业人才培养模式探索

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化工管理 2024年第6期 47-50页

作者：马英楠张盼良曾乐林唐课文湖南理工学院化学化工学院湖南岳阳414006

《中华人民共和国国民经济和社会发展第十四个五年规划和2035年远景目标纲要》明确指出推进部分普通本科高校向应用型转变,因此地方应用型高校化工专业人才培养改革要适应新的发展格局,优化学科专业结构、加强产教融合、校企合作,培养... 详细信息

《中华人民共和国国民经济和社会发展第十四个五年规划和2035年远景目标纲要》明确指出推进部分普通本科高校向应用型转变,因此地方应用型高校化工专业人才培养改革要适应新的发展格局,优化学科专业结构、加强产教融合、校企合作,培养“双师型”教师机制,培养符合区域经济需求的应用型人才。文章从产教融合角度出发,以化学化工专业人才培养为例,提出以产业为导向、以启发为方法的教学模式探索,与企业开展科研项目和校企合作人才培养项目等多方面的合作,提高自身教学水平,推进基础学科高层次人才培养模式改革。

关键词： “十四五”规划地方应用型高校人才培养模式改革产教融合

Identification of biomarkers of cores from the South China Sea

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Acta Oceanologica Sinica 1995年第1期14卷 23-37页

作者： tang Yunqian and Liu kewen(Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China)

The principal factor analysis indicates that short chains nC16, nC17, nC18 and nC19 have relatively largepositive charge, while long chains nC27 and nC29 have relatively large negative charge. On the third principal factoraxis, the carbon with positive charge is almost even carbon, while the carbon with negative charge is almost odd carbon. The parameters of biomarker compounds are divided into 3 groups: (1) nC31/nC17, nC27/nC17, nC27/T andPr/Ph recognizing the input of source material; (2) nC27/T, Ph/nC18, CPI and Pr/Ph showing oxidation and reduction of depositional environment; (3) Tm/Ts, Ph/nC18 indicating the maturity of sedimentary organic matter.

关键词： Factor analysis correspondence analysis biomarkers

多级离心逆流萃取萘普生对映体模拟及实验研究

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化工学报 2013年第11期64卷 4074-4081页

作者：唐课文文平张盼良黄燕湖南理工学院化学化工学院湖南岳阳414006 湘潭大学化工学院湖南湘潭411105

基于萘普生(NAP)对映体的单级手性萃取数学模型和质量守恒定律,建立了多级离心逆流萃取萘普生对映体数学模型。采用Matlab语言编写程序模拟了相比、萃取剂浓度、水相pH值等参数对萃取相出口对映体过剩量和产率的影响,并经实验研究对模... 详细信息

基于萘普生(NAP)对映体的单级手性萃取数学模型和质量守恒定律,建立了多级离心逆流萃取萘普生对映体数学模型。采用Matlab语言编写程序模拟了相比、萃取剂浓度、水相pH值等参数对萃取相出口对映体过剩量和产率的影响,并经实验研究对模型模拟进行验证。结果表明:采用中间进料,对映体浓度[R,SNAP]=0.025mol·L-1、萃取剂浓度[C]=0.050mol·L-1、相比W/O=7、水相pH=2.5、温度T=5℃时,经10级离心逆流萃取后萃取相出口S-NAP对映体过剩量为45%,相应的产率60%,实验结果和模型模拟值符合得很好。

关键词：萘普生计算机模拟萃取离心分离器模型