对羟基苯甲酸丁酯合成方法的改进

Improvement on the synthesis of Butyl P-hyolroxy bengoate

以磷钨酸为催化剂，用丁醇作共沸脱水剂，由对羟基苯甲酸和正了醇合成对羟基苯甲酸丁酯。讨论了该催化酯化反应的各种影响因素，找出了最佳工艺条件。本工艺特点是反应时间短（3．5h），酯收率高（大于92．7％），产品质量好，无需后处理。

Synthesis of butyl p - hydroxybenzoate with phospho - tungstic acid catalyst and azeotropism of n butyl alcohol is studied and the optimum reaction conditions are determined. The method shows the advantages of shorter reaction time, higher yield of product and unnecessary post - treatment.