中国炼油与石油化工 ›› 2014, Vol. 16 ›› Issue (01): 60-65.

• Catalyst Research • 上一篇    下一篇

三乙胺氯铝酸离子液体催化合成2-异丙基萘

李趁民,齐欣,唐向阳   

  1. 天津大学理学院化学系
  • 收稿日期:2013-08-20 修回日期:2013-11-14 出版日期:2014-03-30 发布日期:2014-03-30
  • 通讯作者: 唐向阳 E-mail:txy@tju.edu.cn
  • 基金资助:
    国家自然科学基金

Synthesis of 2-isopropyl naphthalene catalyzed by Et3NHCl-AlCl3 ionic liquids

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  • Received:2013-08-20 Revised:2013-11-14 Online:2014-03-30 Published:2014-03-30
  • Supported by:
    National Natural Science Foundation of China

摘要: In this paper, 2-isopropyl naphthalene has been synthesized by the reaction of naphthalene and isopropyl bromide, using triethylamine hydrochloride-aluminum chloride ionic liquid as the catalyst. The effect of the catalyst amount, the reaction time, the reaction temperature, the ionic liquid dosage, as well as the molar ratio of the reagents on the 2-isopropyl naphthalene yield was systematically investigated. The optimal reaction conditions cover: an AlCl3 to Et3NHCl ratio of 2.0, a reaction time of 3 h, a reaction temperature of 15.0 ℃, a volume fraction of ionic liquid to the mixture (isopropyl bromide, n-dodecane and n-hexane) of 9%, and a naphthalene/isopropyl bromide molar ratio of 4.0. Under the optimal reaction conditions, the conversion of isopropyl bromide reached 98% and the selectivity of 2-isopropyl naphthalene was equal to 80%. The test results verified good catalytic activity upon using Et3NHCl-AlCl3 ionic liquid as the catalyst for alkylation of naphthalene with isopropyl bromide. The activity of the ionic liquid remains unchanged after it has been recycled for 4 times.

关键词: 离子液体, 萘, 异丙基溴, 烷基化

Abstract: 主要研究了以萘和异丙基溴为原料,以三乙胺氯铝酸离子液体为催化剂催化合成2-异丙基萘的反应。实验系统的考察了以下几个方面的因素对2-异丙基萘收率的影响:离子液体催化剂自身的组成比例,反应时间,反应温度,离子液体催化剂的用量以及原料的物料比。最终确定的最佳反应条件是:离子液体采用三氯化铝与三乙胺盐酸盐的物质的量比例为1:2合成,反应时间为3 h,反应温度为15 ℃左右,离子液体的用量为混合物(异丙基溴,正十二烷,正己烷)体积分数的9%,萘与异丙基溴的摩尔比例为4:1。在该最佳反应条件下,异丙基溴的转化率为98%,2-异丙基萘的选择性为80%。实验结果表明,三乙胺氯铝酸离子液体作为催化剂对于萘与异丙基溴之间的烷基化反应有较好的催化活性。实验同时考察了离子液体的可循环利用性,结果显示离子液体反复利用4次后其活性并无明显降低。

Key words: ionic liquid, naphthalene, isopropyl bromide, alkylation