摘要
合成1-(4-磺酸丁基)-3-甲基咪唑三氟甲磺酸盐([NNS][CF3SO3])和1-(4-磺酸丁基)-3-甲基咪唑硫酸氢盐([NNS][HSO4])两种质子酸性的咪唑基离子液体,应用于催化异丁烯齐聚反应,深入研究离子液体种类及反应条件、两种离子液体的复配摩尔比和搅拌方式对催化活性、二聚体C 8=产品的选择性和催化剂循环稳定性的影响,并利用核磁探讨反应进程。结果表明:在催化剂用量5mmol、温度100℃、反应时间3h、两种离子液体复配摩尔比1∶1时,催化活性和二聚产物C 8=的选择性最高,异丁烯的转化率最高达84%,C8=选择性为77%;改进搅拌方式后,催化剂循环稳定性得到明显提高,稳定循环达6次,异丁烯转化率保持在70%以上,C 8=选择性高达90%以上。
Two proton acidic imidazolium-based ionic liquids(ILs)of 1-(4-sulfobutyl)-3-methylimidazolium trifluoromethanesulfonate([NNS][CF3SO3])and 1-(4-sulfobutyl)-3-methylimidazolium hydrosulfate([NNS][HSO 4]),were synthesized and applied in the oligomerization of isobutene.Some important parameters,including the types of ionic liquids,amount of catalysts,the reaction temperature,the reaction time,molar ratios of two ILs,stirring method and speeds,were screened.The optimized reaction conditions were determined as follows,5 mmol of catalyst,100℃,3 h,and molar ratio of 1∶1 for the two ILs.Under these conditions,the catalytic activity of the complexed ILs reached the highest with conversion rate of 84%for isobutene and selectivity of 77%for C8=.The complex ILs could be recycled six times without obvious loss of catalytic activities,and conversion rate of isobutene remained 70%with above 90%selectivity of C8=.The reaction was monitored on NMR and the formation process was further determined.
作者
余晓佳
刘莹
王慧
吴幼青
郭艳秋
YU Xiaojia;LIU Ying;WANG Hui;WU Youqing;GUO Yanqiu(School of Resources and Environment Engineering,East China University of Science and Technology,Shanghai 200237,China;CAS Key Laboratory of Green Process and Engineering,State Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)
出处
《中国科学院大学学报(中英文)》
CSCD
北大核心
2020年第5期599-605,共7页
Journal of University of Chinese Academy of Sciences
基金
国家自然科学基金(21576264,21776285和21306098)资助。
关键词
齐聚
异丁烯
质子酸性离子液体
高选择性二聚
oligomerization
isobutene
proton acidic ionic liquid
highly selective dimerization