摘要
报道了无水AlCl3 与季铵盐形成的离子液体 (ionicliquid)催化邻二甲苯与 1,2 -二氯乙烷烷基化反应 ,反应产物为 1,2 -双 (3,4 -二甲基苯基 )乙烷。短碳链季铵盐四丁基溴化铵或三乙胺盐酸盐与无水AlCl3 形成的离子液体具有与产物易于分离的优点 ,1,2 -双 (3,4 -二甲基苯基 )乙烷的分离产率为 4 0 %～ 6 0 %。催化剂重复使用四次目标产物的产率和纯度没有明显的变化。长链季铵盐溴代十六烷吡啶和十六烷基三甲基溴化铵与无水AlCl3 形成的离子液体溶解在反应物和产物中 ,使得产物与催化剂较难分离 ,这主要是长链季铵盐在有机溶剂中的溶解度较大的原因所致。
The alkylation of oxylene with 1,2-dichloroethane catalyzed by ionic liquid formed from anhydrous AlCl 3 and quaternary ammonium salt is investigated. The product is 1,2-bis(3,4-dimethylphenyl)ethane. The ionic liquids formed from anhydrous AlCl 3 with low-carbon-chain quaternary ammonium salt such as tetrabutylammonium bromide or triethylamine hydrochloride exhibit the advantage of easy separation from reaction mixture. The isolated yield of 1,2-bis(3,4-dimethylphenyl)ethane is in the range of 40% ～60 %. The isolated yield and purity of target product do not change obviously after the ionic liquid catalyst is reused four times. The ionic liquids formed from anhydrous AlCl 3 with high-carbon-chain quaternary ammonium salt such as hexadecylpyridine bromide or hexadecyltrimethylammonium bromide are soluble in the reaction mixture, which causes the difficulties in separating the product from catalyst.
出处
《辽宁化工》
CAS
2002年第2期47-49,共3页
Liaoning Chemical Industry
