Bronsted-acidic ionic liquids as catalysts for synthesizing trioxane

作     者：Yamei Zhao Yufeng Hu Jianguang Qi Weiting Ma 

作者机构：State Key Laboratory of HeavyOil Processing and High Pressure Fluid Phase Behavior&Property Research LaboratoryChina University of PetroleumBeijing 102249China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2016年第24卷第10期

页      面：1392-1398页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：Supported by the National Natural Science Foundation of China(21576285 21276271) 

主　　题：Bronsted-acidic Ionic liquids Trioxane Catalyst Hammett acidity function 

摘      要：The batch reaction experiments have been made for the first time to investigate the effect of ionic structure on the reactivity and selectivity of the trioxane-forming reaction catalyzed by a Br?nsted-acidic ionic liquid(IL).The ILs considered include 1-cyclohexyl-2-pyrrolidinonium trifluoromethanesulfonate([NCy P][TfO ]),1-cyclohexyl-2-pyrrolidinonium benzenesulfonate([NCyP ][BSA]),1-cyclohexyl-2-pyrrolidinonium p-toluenesulfonate([NCyP ][pTSA]),1-octyl-2-pyrrolidinonium 2,4-dinitrobenzenesulfonate([NOP][DNBSA]),1-octyl-2-pyrrolidinonium benzenesulfonate([NOP][BSA]),1-octyl-2-pyrrolidinonium methanesulfonate([NOP][MSA]),and 1-octyl-2-pyrrolidinonium trifluoromethanesulfonate([NOP][Tf O]).It is found that the yield of trioxane in the reaction solution correlates inversely with the Hammett acidity function H0 of the aqueous solution of the corresponding *** of the cation structure from [NCyP ]+to [NOP]+exerts little influence on the yield and the selectivity of trioxane in the reaction *** [TfO ]-or [DNBSA]-in place of [MSA]-or [BSA]-apparently increases the yield of trioxane,but only slightly increases the concentration of formic acid in the reaction *** continuous production experiments have been made to investigate the performance of [NOP][MSA],[NOP][DNBSA],[NCyP ][TfO ],and H2SO4 as an extraction distillation *** effect of [NCyP ][TfO ] considerably overrides that of *** yield and the selectivity of trioxane are both increased when [NCyP ][TfO ] is used instead of H2SO4 at a reaction time 5 h.