催化合成水杨酸酯的工艺研究

芳基磺酸（ＡＳＡ） 催化水杨酸（２ 羟基苯甲酸） 和Ｃ４ ～Ｃ５ 醇的酯化反应，性能优于磷钨酸等其他４ 种催化剂。探讨并找到了ＡＳＡ催化合成水杨酸丁酯、戊酯的优化反应条件：原料配比ｎ（Ｃ７Ｈ６Ｏ３）∶ｎ（ＲＯＨ）＝１∶１－８，催化剂ＡＳＡ的用量为酸质量的５ ％ ～７％ ，反应温度１１０ ～１４０ ℃，反应时间４～７ ｈ，转化率达９２％ ～９７％ ，产品纯度大于９９％ 。

Process for Catalytic Esterification of Salicylic Acid with C4-C5 Alcohols

Improved process for preparing esters of salicylic acid(2 hydroxybenzoic acid) and C 4-C 5 alcohols was obtained by using aryl sulphonic acid(ASA) instead of other four kinds of catalysts.In the presence of ASA,the optimized reaction conditions for preparing butyl and/or pentyl 2 hydroxybenzoates were presented:the ratio of acid to alcohol n(C 7H 6O 3)∶n(ROH) was 1∶1 8,the amount of ASA was 5%-7% of the mass of salicylic acid charged in the reaction,the reaction temperature was 110-140 ℃,and the reaction time was 4-7 h.The yield was about 92%-97%,the purity was over 99% by GC analysis.