离子液体催化邻苯二酚与叔丁醇烷基化反应
SO_3H-FUNCTIONALIZED iONIC LIOUIDS FOR SELECTIVE ALKYLATION OF CATECHOL WITH tert-BUTANOL
郜蕾 1刘民 1聂小娃 1刘新 1郭新闻1
作者信息
- 1. 大连理工大学精细化工国家重点实验室,辽宁,大连,116012
- 折叠
摘要
以廉价的烷基胺为原料合成了SO_3H-功能化离子液体(IL),并采用NMR、ESI-MS、TG-DTG等手段对其结构及物性进行表征.将该离子液体作为催化剂,考察反应条件对离子液体催化邻苯二酚叔丁醇(TBA)烷基化反应性能的影响,以及离子液体的重复使用性,比较了离子液体与常规酸催化剂催化该烷基化反应性能的差别.结果表明,在反应温度150℃、反应时间3 h、n(邻苯二酚):n(TBA):n(IL)为2:1:0.1的优化条件下,邻苯二酚的转化率、4-叔丁基邻苯二酚(4-TBC)的选择性分别可达41.5%和97.1%,与液体酸的催化效果接近.根据实验结果和模拟计算推测了可能的反应机理.
Abstract
SO_3H-functionalized ionic liquids (IL) were synthesized by using tri-alkylamine and 1,4-butanesultone as the sources. The structures and physical properties of ILs were characterized by NMR, ESI-MS and TG-DTG. Their catalytic performances in the alkylation of catechol with tert-butyl alcohol (TBA) were investigated. The influences of reaction temperature, reaction time, reactant ratio, the amount and the recycle times of IL on the catalytic performance of IL in the tert-butylation of catechol were studied. Meanwhile, the catalytic performance of IL was compared with that of conventional liquid acids and solid acids. The results indicated that under optimized reaction conditions of 150℃, 3 h, n(Catechol) : n(TBA) : n(IL) was 2 : 1 :0.1, the conversion of catechol and the selectivity of 4-TBC were 41.5% and 97.1% respectively. The SO_3 H-functionlized ionic liquid exhibited high catalytic activity in the alkylation of catechol with TBA, which wassimilar to liquid acid. The possible mechanism for this reaction system was discussed based on thereaction results and the simulation calculated results.
关键词
离子液体/烷基化/邻苯二酚/叔丁醇Key words
ionic liquids/alkylation/catechol/tert-butanol引用本文复制引用
基金项目
新世纪优秀人才支持计划(NCET-04-0268)
111引智计划项目()
出版年
2010
NETL
NSTL
维普
万方数据