肉桂酸酯食用香料合成方法研究(Ⅱ)——强酸性离子交换树脂催化肉桂酸酯化反应

STUDIES OF SYNTHETIC METHOD ON CINNAMIC ACID ESTER FOOD FLAVOR(Ⅱ)——Catalytic Esterification of Cinnamic Acid with Strong Acidity Cation—exchange Resins

本文用强酸性离子交换树脂作为液固相酯化反应的催化剂,合成了肉桂酸系列酯。实验探讨了催化剂类型及用量、料比、反应时间和带水剂对酯产率的影响。当醇与酸摩尔比为1.25,催化剂加入量为25g(以摩尔肉桂酸计),回流反应3～4小时的情况下,D72树脂显示了较高的催化活性和良好的选择性,且催化活性稳定,使用寿命长,是较理想的液固相酯化催化剂。

The strong acidity Cation-exchange resins are used as catalysts in liquid —solid hase esterification so that cinnamic acid esters are prepared. The effect of the type, the mount used, ratio of feedstocks, reaction time and dehydrating agent of the catalyst on yield f esters is investigated with experiments. When the molor ratio of alcohols and cinnamic acid s 1. 25, the amount of catalyst used is 25g(per mol cinnamic acid) and the esterification ccurs at refux for 3 or 4 hours, the resin D72 shows superior catalytic activity, seletivity, he stability of catalytic activity and longer service life. It serves as a good catalyst in iquid — solid phase esterification.