硫酸氢钠催化合成苯甲酸正丁酯的研究

Study on new technology of Synthesis of n-butyl benzoate catalyzed by sodium hydrogen sulphate

以硫酸氢钠为催化剂 ,催化合成了苯甲酸正丁酯 ,并用正交实验法确定了反应的最佳条件 :催化剂用量为 0 6 g/0 1mol苯甲酸 ,醇酸物质的量比为 2∶1;回流时间为 3 5～ 4 0h。苯甲酸的酯化率可达 98%。该催化剂催化效果好 ,用量少 ,酯化率高 ,污染小 ,价廉易得 。

Sodium hydrogen sulphate is a good catalyst for the esterification of butyl benzoate.The optimum conditions were selected as following:the weight of catalyst is 0.6g(0.1mol) benzoic acid,the molar ratio of alcohol to acid is 2∶1 and the reaction time is 3.5～4.0 h.The esterification of benzoic acid is about 98.04%.Experimental results showed that sodium hydrogen sulphate is a highly active catalyst for the reaction,with the advantages of little amount used,good esterification and little waste discharge.It is an inexpensive and very practical method.