Isobutane/2-butene alkylation catalyzed by Brønsted-Lewis acidic ionic liquids
Shiwei Liu1, Shuang Tan1, Bing Bian1,2
1College of Chemical Engineering, Qingdao University of Science and Technology No. 53 Zhengzhou Road Qingdao 266042 China liufusheng63@sina.com liushiweiqust@126.com +86 532 84022719.
Abstract:
The alkylation reaction of isobutane with 2-butene to yield C8-alkylates was performed using Brønsted-Lewis acidic ionic liquids (ILs) comprising various metal chlorides (ZnCl2, FeCl2, FeCl3, CuCl2, CuCl, and AlCl3) on the anion. IL 1-(3-sulfonic acid)-propyl-3-methylimidazolium chlorozincinate [HO3S-(CH2)3-mim]Cl-ZnCl2 ( exhibited outstanding catalytic performance, which is attributed to the appropriate acidity, the synergistic effect originating from its double acidic sites and the promoting effect of water on the formation and transfer of protons. The Lewis acidic strength of IL played an important role in improving IL catalytic performance. A 100% conversion of 2-butene with 85.8% selectivity for C8-alkylate was obtained under mild reaction conditions. The IL reusability was good because its alkyl sulfonic acid group being tethered covalently, its anion [Zn2Cl5]- inertia to the active hydrogen, and its insolubility in the product. IL [HO3S-(CH2)3-mim]Cl-ZnCl2 had potential applicability in the benzene alkylation reaction with olefins and halohydrocarbons.
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