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Catalysts 2018, 8(1), 7; https://doi.org/10.3390/catal8010007

Stability, Deactivation, and Regeneration of Chloroaluminate Ionic Liquid as Catalyst for Industrial C4 Alkylation

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Postbox 35, Beijing 100029, China
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Received: 29 September 2017 / Revised: 23 November 2017 / Accepted: 24 November 2017 / Published: 29 December 2017
(This article belongs to the Special Issue Organocatalysis in Ionic Liquids)
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Abstract

Alkylation of isobutane and 2-butene was carried out in a continuous unit using triethylamine hydrochloride (Et3NHCl)-aluminum chloride (AlCl3) ionic liquid (IL) as catalyst. The effects of impurities such as water, methanol, and diethyl ether on the stability of the catalytic properties and deactivation of the ionic liquid were studied in the continuous alkylation. In the Et3NHCl-2AlCl3 ionic liquid, only one half of the aluminum chloride could act as the active site. With a molar ratio of 1:1, the active aluminum chloride in the ionic liquid was deactivated by water by reaction or by diethyl ether through complexation while the complexation of aluminum chloride with two molecular proportions of methanol inactivated the active aluminum chloride in the ionic liquid. The deactivation of chloroaluminate ionic liquid was observed when the active aluminum chloride, i.e., one half of the total aluminum chloride in the ionic liquid, was consumed completely. The regeneration of the deactivated ionic liquid was also investigated and the catalytic activity could be recovered by means of replenishment with fresh aluminum chloride. View Full-Text
Keywords: alkylation; isobutane; 2-butene; ionic liquids alkylation; isobutane; 2-butene; ionic liquids
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Li, X.; Zhang, J.; Huang, C.; Chen, B.; Li, J.; Lei, Z. Stability, Deactivation, and Regeneration of Chloroaluminate Ionic Liquid as Catalyst for Industrial C4 Alkylation. Catalysts 2018, 8, 7.

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