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removal of Trace olefins from Aromatics by Catalytic Alkylation Using 1-Alkyl-3-methylimidazolium Bromochloroaluminate Catalyst

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China Petroleum Processing & Petrochemical Technology 2011年第2期13卷 14-18页

作者： Sun Yu Shi Li(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237) State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

removal of trace olefins from aromatic liquids had been investigated in the presence of various ionic liquids like 1-ethyl-3-methylimidazoliurn bromochloroaluminate （EMIMBr-AlCl3）, 1-butyl-3-methylimidazolium bromochloroaluminate （BMIMBr-AlCl3）, l-hexyl-3-methylimidazolium bromochloroaluminate （HMIMBr-AlCl3）, and 1-octyl-3-methylimidazolium bromochloroaluminate （OMIMBr-A1C13）. It was found that the longer the alkyl chain of ionic liquid cations was, the higher the olefins conversion would be. OMIMBr-AlCl3 （with 0.67 molar fraction of AlCl3） had an obvious performance on olefins removal. The influences of various reaction parameters such as the dosage of catalyst, the reaction temperature, and the reaction time on the reaction catalyzed by OMIMBr-AlCl3 were investigated. Under optimum reaction conditions, a higher than 99% conversion of olefins was achieved. The preliminary results revealed that the process could save time, consume less energy, separate products easier, and cause less pollution to the environment.

关键词： ionic liquids olefins removal 1-alkyl-3-methylimidazolium bromochloroaluminate aromatic

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removal of Trace olefins from Aromatics Catalyzed by[bmim]Br-AlCl_3 Ionic Liquid

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China Petroleum Processing & Petrochemical Technology 2010年第2期12卷 41-44页

作者： Jiang Zhenghong Hou Minghui Weng Huixin Shi Li (State Key Lab of Chemical Engineering,East China University of Science & Technology,Shanghai 200237) State Key Lab. of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

1-Butyl-3-methylimidazolium bromochloroaluminate （[bmim]Br-AlCl3） ionic liquid was used as an acid catalyst for removal of trace olefins from the aromatic hydrocarbons. The influence of various reaction parameters such as reaction time, temperature, dosage and acid strength of catalyst was investigated. The experimental results demonstrated that the ionic liquid exhibited excellent activity under mild reaction conditions, with the conversion of olefins reaching 98.84% and the bromine index of the aromatics varying from 1129 to 13. On the basis of the results obtained, thereof, a possible reaction mechanism was proposed.

关键词： ionic liquid bromine index olefins removal aromatics catalyst

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