活性炭负载钛酸四丁酯催化合成二甘醇二苯甲酸酯  

Synthesis of diethylene glycol dibenzoate catalyzed by Ti(OBu)_4/AC

作　　者：陈慕华[1] 陈燕青[1] 陈思[1] 朱新宝[1] 

机构地区：[1]南京林业大学化工学院,江苏南京210037

出　　处：《化工进展》2014年第5期1201-1204,1241,共5页Chemical Industry and Engineering Progress

基　　金：中国博士后科学基金(2012M511288);江苏高校优势学科建设工程项目

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=6.28×109exp102.80RT/CACB。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 102.80 /RT-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 

分 类 号：TQ225.24[化学工程—有机化工]