化工进展

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活性炭负载钛酸四丁酯催化合成二甘醇二苯甲酸酯

陈慕华,陈燕青,陈思,朱新宝   

  1. 南京林业大学化工学院,江苏 南京 210037
  • 出版日期:2014-05-05 发布日期:2014-05-05

Synthesis of diethylene glycol dibenzoate catalyzed by Ti(OBu)4/AC

CHEN Muhua,CHEN Yanqing,CHEN Si,ZHU Xinbao   

  1. School of Chemical Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,China
  • Online:2014-05-05 Published:2014-05-05

摘要: 以活性炭负载钛酸四丁酯[Ti(OBu)4/AC]为催化剂,用于催化合成二甘醇二苯甲酸酯(DEDB)。通过实验确定了合成DEDB的适宜工艺条件:n(BA)∶n(DEG) = 2∶1、催化剂用量为1.25%,带水剂用量为20.0%,反应温度为200℃,反应时间为7h,该反应条件下酯化率可达98.1%。催化重复使用实验表明该催化剂具有良好的稳定性。同时建立了该酯化合成的表观动力学模型,得到反应速率方程为:rA=6.28× 109exp CACB。

关键词: 钛酸四丁酯, 固载催化剂, 活性炭, 二甘醇二苯甲酸酯

Abstract: Diethylene glycol dibenzoate was synthesized by the reaction of benzoic acid (BA) with diethylene glycol (DEG) using Ti(OBu)4/AC as catalyst. The optimal reaction condition was found as:the molar ratio of benzoic acid to diethylene glycol was 2∶1,the mass ratio of catalyst to benzoic acid was 1.25%,the mass ratio of butyl ether to benzoic acid was 20%,reaction temperature was 200℃,and reaction time was 7h. The optimal esterification rate was up to 98.1%. After three times of repeated use,the esterification yield still maintained above 97%. The apparent kinetics model of esterification was established,and the equation of reaction rate was:rA=6. 28× 109exp CACB.

Key words: tetrabutyl titanate, supported catalyst, active carbon, diethylene glycol dibenzoate

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