异丁烯与醋酸酯化合成醋酸叔丁酯

Esterification of Acetic Acid with Isobutene to Tert-butyl Acetate

摘要:

以锆复合氧化物和大孔强酸性阳离子交换树脂为催化剂，催化异丁烯与醋酸合成醋酸叔丁酯。采用正丁胺电位滴定法对催化剂的酸强度和酸量进行了表征。结果表明，对异丁烯与醋酸酯化反应而言，随着酸量增加转化率增大，但酸强度增大会导致选择性的下降。以含异丁烯质量分数为10%的混合烃为原料，离子交换树脂为催化剂，异丁烯单程转化率可达80%，醋酸叔丁酯的选择性为95.98%。

Abstract:

Esterification of acetic acid with isobutene to tert-butyl acetate catalyzed by zirconium composite oxide and macroporous strong acid cation exchange resin has been investigated. Acid strength and the number of acid site of catalysts were measured by potentiometric titration with n-butylamine. The results show that the conversion of isobu-tene increases with the amount of acid increasing, but the selectivity of tert-butyl acetate decreases with the acid strength increasing. A maximum selectivity for TBA and conversion of isobutene could be achieved at 95.98% and 80% respectively, while hydrocarbon mixture which contains 10% isobutene as feedstock for esterification catalyzed by cation exchange resin.