化工学报 ›› 2021, Vol. 72 ›› Issue (8): 4155-4165.DOI: 10.11949/0438-1157.20201652

• 催化、动力学与反应器 • 上一篇    下一篇

混合离子液体催化反应精馏合成乙酸正己酯

宋振兴(),崔现宝(),张缨,张雪梅,何杰,冯天扬,王纪孝   

  1. 天津大学化工学院,化学工程联合国家重点实验室,天津 300350
  • 收稿日期:2020-11-16 修回日期:2021-01-20 出版日期:2021-08-05 发布日期:2021-08-05
  • 通讯作者: 崔现宝
  • 作者简介:宋振兴(1996—),男,硕士研究生,18568442038@163.com
  • 基金资助:
    国家自然科学基金项目(21776201)

Synthesis of n-hexyl acetate via reactive distillation catalyzed by mixed ionic liquids

Zhenxing SONG(),Xianbao CUI(),Ying ZHANG,Xuemei ZHANG,Jie HE,Tianyang FENG,Jixiao WANG   

  1. State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
  • Received:2020-11-16 Revised:2021-01-20 Online:2021-08-05 Published:2021-08-05
  • Contact: Xianbao CUI

摘要:

离子液体催化反应精馏是提高酯交换平衡反应转化率的一种绿色有效方法。以离子液体1-丙基磺酸-3-甲基咪唑三氟甲烷磺酸盐([PSO3HMIm][OTf])和离子液体1-辛基-2,3-二甲基咪唑双(三氟甲烷磺酰)亚胺盐([OMMIm][Tf2N])的混合物作为乙酸甲酯和正己醇进行酯交换反应合成乙酸正己酯的催化剂,测定了酯交换反应动力学。探讨了混合比、反应温度、反应物初始摩尔比、催化剂浓度对反应速率和乙酸甲酯转化率的影响,考察了催化剂的回收性能。利用实验数据回归得出混合离子液体催化酯交换反应动力学方程。在反应动力学的基础上进行了乙酸甲酯和正己醇的酯交换反应精馏流程模拟,分析了理论板数、回流比、进料位置及反应段塔板数、催化剂用量、持液量等参数对反应精馏塔的影响。在优化的操作条件下,获得纯度为0.9993的乙酸正己酯产品。

关键词: 离子液体, 催化, 反应动力学, 反应精馏, 过程模拟

Abstract:

Ionic liquid catalytic reactive distillation is a green and effective method to improve the conversion rate of the transesterification equilibrium reaction. The mixture of 1-propylsulfonate-3-methylimidazolium trifluoromethane sulfonate ([PSO3HMIm][OTf]) and 1-octyl-2,3-dimethylimidazolium bis((trifluoromethyl)sulf-onyl)imide ([OMMIm][Tf2N])) were utilized as the catalyst for transesterification of methyl acetate with n-hexanol, and the reaction kinetics of the transesterification were measured. The effects of mixing ratio, reaction temperature, initial molar ratio of reactants and concentration of catalyst on reaction rate and the conversion of methyl acetate, and recovery performance of the catalyst were investigated. The reaction kinetic equation of the transesterification catalyzed by mixed ionic liquids was obtained by the correlation of experimental data. Based on the reaction kinetics, the reactive distillation process for transesterification of methyl acetate and n-hexanol was simulated, and the effects of theoretical stage number, reflux ratio, feed position, theoretical stages in reaction section, catalyst amount and liquid holdup on the reactive distillation column were analyzed. Under the optimized operating conditions, hexyl acetate product with purity of 0.9993 was obtained by the reactive distillation process.

Key words: ionic liquids, catalysis, reaction kinetics, reactive distillation, process simulation

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