Alkylation of toluene with 2-chloro-2-methylpropane (t-Bu-Cl) to synthesize para-tert-butyltoluene (PTBT) was carried out in the presence of triethylamine hydrochloride-aluminum chloride ionic liquids used as the cata...Alkylation of toluene with 2-chloro-2-methylpropane (t-Bu-Cl) to synthesize para-tert-butyltoluene (PTBT) was carried out in the presence of triethylamine hydrochloride-aluminum chloride ionic liquids used as the catalyst. The ionic liquids were prepared with different molar ratios of Et3NHCl to AlCl3 , and the effect of the molar ratio between AlCl 3 and Et3NHCl, the reaction time, the reaction temperature, the ionic liquid dosage, as well as the molar ratio of toluene to chloro-2-methylpropane on the alkylation reaction of toluene with chloro-2-methyl-propane was investigated. The test results showed that the acidic ionic liquids prepared with Et3NHCl and AlCl3 had good activity and selectivity for the alkylation reaction of toluene with alkyl chloride to produce PTBT. The optimal reaction conditions were specified at anAlCl3 to Et3NHCl ratio of 1.6, a reaction temperature of 20℃, a mass fraction of toluene to ionic liquid of 10%, and a chloro-2-methylpropane to toluene molar ratio of 0.5. Under the suitable reaction conditions, a 98% conversion of chloro-2-methylpropane and an 82.5% selectivity of PTBT were obtained. Ionic liquids could be reused 5 times with its catalytic activity unchanged, and the regenerated ionic liquids can be recycled.展开更多
基金the financial support from the Beijing University of Chemical Technologythe Key Laboratory of Advanced Chemical Engineering and Technology, Beijing Institute of Petrochemical Technology, for the analysis of samples
文摘Alkylation of toluene with 2-chloro-2-methylpropane (t-Bu-Cl) to synthesize para-tert-butyltoluene (PTBT) was carried out in the presence of triethylamine hydrochloride-aluminum chloride ionic liquids used as the catalyst. The ionic liquids were prepared with different molar ratios of Et3NHCl to AlCl3 , and the effect of the molar ratio between AlCl 3 and Et3NHCl, the reaction time, the reaction temperature, the ionic liquid dosage, as well as the molar ratio of toluene to chloro-2-methylpropane on the alkylation reaction of toluene with chloro-2-methyl-propane was investigated. The test results showed that the acidic ionic liquids prepared with Et3NHCl and AlCl3 had good activity and selectivity for the alkylation reaction of toluene with alkyl chloride to produce PTBT. The optimal reaction conditions were specified at anAlCl3 to Et3NHCl ratio of 1.6, a reaction temperature of 20℃, a mass fraction of toluene to ionic liquid of 10%, and a chloro-2-methylpropane to toluene molar ratio of 0.5. Under the suitable reaction conditions, a 98% conversion of chloro-2-methylpropane and an 82.5% selectivity of PTBT were obtained. Ionic liquids could be reused 5 times with its catalytic activity unchanged, and the regenerated ionic liquids can be recycled.
