活性炭固载磷钼钨杂多酸催化合成醋酸正T酯

摘要

采用在80～90℃的水浴中蒸发水分的方法，用活性炭对磷钼钨杂多酸进行了固载。并利用所制备的活性炭固载型杂多酸催化剂，探讨了醋酸正丁酯的合成反应条件。结果表明，加入5ml环已烷作带水剂，采用醇酸的摩尔比为1：1. 1，即加入10ml冰醋酸和14.4ml正丁醇，使用1.0克该固载型催化剂，用分水装置，在回流条件下反应2小时，酯产率可达92.3%。所用的负载型杂多酸催化剂重复使用四次后，产率仍有74.4%。%Phosphotungstomolybdate heteropolyacid was supported onto activated carbon through vaporization. Reaction condition for synthesis of n-butyl acetate was investigated using the heteropolyacid catalyst. N-butyl acetate yield of 92.3% was attained under following condition: 5ml cyclohexane as water-carrying agent, n-butanol/acetic acid=l/1.1 (mol)(i.e.,10ml acetic acid and 14.4ml n-butanol), 1.0g catalyst, with water separation and recycle, reaction time＝2h. The heteropolyacid catalyst remains 74.4% activity after four times of repeated use.