t-BAMBP的催化合成及精馏纯化研究

采用4-叔丁基苯酚与苯乙烯为原料,在磷酸的催化下合成了4-叔丁基-2-(α-甲基苄基)苯酚(t-BAMBP).适宜的合成反应条件为反应温度150℃,反应时间150min,反应物料4-叔丁基苯酚与苯乙烯之摩尔比为1∶1.8,催化剂用量为总反应物料量的1.5%.在该工艺条件下,4-叔丁基苯酚的转化率为81.29%,t-BAMBP的产率为81.04%.采用减压精馏的方法提纯t-BAMBP,确定了t-BAMBP产品的馏出温度为156～157℃,绝对压力为400Pa.t-BAMBP的纯度达到98.79%.分析了t-BAMBP合成过程中的脱叔丁基反应机理,推测了副产物的生成途径.

Catalytic Synthesis of t-BAMBP and Its Purification through Distillation

4-tert-butyl-2-(α-methylbenzyl) phenol(t-BAMBP)was synthesized from tert-butylphenol and styrene catalyzed by concentrated phosphoric acid.The optimal synthesis conditions were as follows: a reaction temperature of 150 ℃,a reaction time of 150 min,a reactant ratio of 1∶1.8,and a catalyst dosage equal to 1.5% of the feed stock.Under such conditions,the conversion percent of tert-butyl phenol was 81.29%,and the yield of t-BAMBP was 81.04%.The synthetic products were separated and purified by vacuum distillation.The proper distillation temperature was 156~157 ℃,and the absolute pressure was 400Pa.The purity of t-BAMBP was higher than 98.79%.The tert-butyl group removing mechanism in the t-BAMBP synthesis process was analyzed,and the by-products forming routes were deduced.