化工学报 ›› 2017, Vol. 68 ›› Issue (1): 163-169.DOI: 10.11949/j.issn.0438-1157.20161190

• 分离工程 • 上一篇    下一篇

反应萃取分离2-苯基丁酸对映体的动力学

蒋盼1, 张盼良2, 曾乐林2, 许卫凤2, 唐课文2   

  1. 1 湘潭大学化工学院, 湖南 湘潭 411105;
    2 湖南理工学院化学化工学院, 湖南 岳阳 414006
  • 收稿日期:2016-08-25 修回日期:2016-09-22 出版日期:2017-01-05 发布日期:2017-01-05
  • 通讯作者: 唐课文
  • 基金资助:

    国家重点基础研究发展计划项目(2014CB260407)。

Kinetics of reaction extraction separation of 2-phenylbutyric acid enantiomers

JIANG Pan1, ZHANG Panliang2, ZENG Lelin2, XU Weifeng2, TANG Kewen2   

  1. 1 College of Chemical Engineering, Xiangtan University, Xiangtan 411105, Hunan, China;
    2 Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, Hunan, China
  • Received:2016-08-25 Revised:2016-09-22 Online:2017-01-05 Published:2017-01-05
  • Contact: 10.11949/j.issn.0438-1157.20161190
  • Supported by:

    supported by the National Basic Research Program of China (2014CB260407).

摘要:

通过恒界面池法进行了羟乙基-β-环糊精反应萃取2-苯基丁酸对映体的动力学研究。采用双膜理论和均相反应模型描述了萃取过程的相际传质机理,并考察了搅拌速率、界面面积、对映体初始浓度和萃取剂初始浓度等因素对2-苯基丁酸对映体的萃取动力学的影响。实验结果表明羟乙基-β-环糊精与2-苯基丁酸对映体之间的包合反应属于“快反应”;2-苯基丁酸对映体反应分级数为1,羟乙基-β-环糊精反应分级数为2;(+)-2-苯基丁酸和(-)-2-苯基丁酸在278 K下的反应速率常数分别为2.829×10-4、1.803×10-4 m6·mol-2·s-1。该萃取动力学研究为大规模生产中的反应萃取过程的设计和操作以及设备的设计和过程强化提供了科学的依据。

关键词: 动力学, 萃取, 化学反应, 2-苯基丁酸

Abstract:

Kinetics research on the reactive extraction of 2-phenylbutyric acid enantiomers using hydroxyethyl-β-cyclodextrin(HE-β-CD) as extractant was performed in a Lewis cell.A homogeneous reaction model and a two-film theory were employed to describe the mass transfer mechanism of the reactive extraction process.The process parameters affecting the initial extraction rate, including agitation speed, interfacial area, pH value of aqueous phase, initial concentration of 2-phenylbutyric acid(2-PBA) enantiomers and initial concentration of extractant, were separately studied.The results showed that the reaction between hydroxyethyl-β-cyclodextrin and 2-phenylbutyric acid was a fast reaction.It was found that the reaction was first order in 2-phenylbutyric acid and second order in hydroxyethyl-β-cyclodextrin.The forward rate constants for the extraction of(+)-2-phenylbutyric acid and(-)-2-phenylbutyric acid were 2.829×10-4 and 1.803×10-4m6·mol-2·s-1, respectively.The results were useful for the design and operation of reactive extraction process in large-scale production, and provide scientific basis for equipment design and process intensification.

Key words: kinetics, extraction, chemical reactive, 2-phenylbutyric acid

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