超声辅助合成乙酸苄酯反应条件优化及其动力学  

Reaction Conditions and Kinetics in Synthesis of Benzyl Acetate by Ultrasound

作　　者：王俊[1] 陈曦[1] 吕效平[1] 韩萍芳[1] 

机构地区：[1]南京工业大学化学化工学院超声化学工程研究所,江苏南京210009

出　　处：《化学反应工程与工艺》2011年第2期172-177,共6页Chemical Reaction Engineering and Technology

摘　　要：以乙酸和苯甲醇为原料,浓硫酸为催化剂催化合成乙酸苄酯。考察了超声频率、超声强度、反应温度、催化剂用量、带水剂种类和带水剂用量对合成乙酸苄酯的影响,同时对超声和无超声辅助合成乙酸苄酯条件下的动力学进行了研究。结果表明,在超声频率10kHz,超声强度1.0W/cm^2,苯甲醇和乙酸的物质的量之比1.5:1,催化剂用量为2.0mL,带水剂甲苯20mL,反应温度120℃,反应时间90min条件下,酯化率达到93.7%。超声辅助对乙酸苄酯的合成具有较好的效果,其反应活化能从无超声条件下的89.46kJ/mol下降到73.46kJ/mol。Benzyl acetate was synthesized from acetic and benzyl alcohol using concentrated sulturic acid as catalyst under ultrasonic radiation. The effects of ultrasonic frequency, ultrasonic intensity, reaction temperature, catalyst dosage, water-carrying agent and water-carrying agent dosage on the esterification were investigated. The kinetics of synthesis of benzyl acetate was studied under ultrasonic radiation or not. The results showed that the esterification reached 93.7% under the conditions of ultrasonic frequency 10 kHz, ultrasonic intensity 10 W/cm^2, molar ratio ofbenzyl alcohol to acetate 1.5：1, catalyst dosage 2.0 mL, toluene（water-carrying agent） 20 mL, reaction temperature 120℃ and reaction time 90 min. Ultrasound could reduce activation energy of synthesis of benzyl acetate from 89.46 kJ/mol to 73.46 kJ/mol.

关 键 词：超声 乙酸苄酯 酯化反应 动力学 乙酸 苯甲醇 浓硫酸 

分 类 号：TQ032[化学工程] TQ426.6