Efficient synthesis of dimethyl carbonate via transesterification of ethylene carbonate catalyzed by swelling poly(ionic liquid)s  

作　　者：Xin Wang Hao Hu Bihua Chen Lulu Dang Guohua Gao 

机构地区：[1]Shanghai Key Laboratory of Green Chemistry and Chemical Processes,School of Chemistry and Molecular Engineering,East China Normal University,3663 North Zhongshan Road,Shanghai,200062,China

出　　处：《Green Chemical Engineering》2021年第4期423-430,共8页绿色化学工程（英文）

基　　金：supported by the National Natural Science Foundation of China(21773068);the National Key Research and Development Program of China(2017YFA0403102,2020YFA0710201);Shanghai Leading Academic Discipline Project(B409).

摘　　要：The synthesis of dimethyl carbonate(DMC)via transesterification of ethylene carbonate(EC)and methanol(MeOH)was an environmental and practical strategy.Herein,poly(ionic liquid)s(PILs)with swelling abilities were synthesized by free radical copolymerization of N-vinylimidazolium ionic liquids,sodium 4-vinylbenzoate and cross-linker(1,8-triethylene glycoldiyl-3,3'-divinylimidazolium bromide([(EG)_(3)-DVIm]Br_(2)).The swelling abilities of PILs in various solvents were measured,and PILs could swell in methanol(MeOH).The swelling ability of PILs in MeOH could be modulated by changing the cross-linker content and chain length of 3-alkyl-substituents on imidazolium.The swollen state of PILs in MeOH presented a porous cross-linked network structure observed by the cryo-scanning electron microscope(cryo-SEM).The swelling PILs were used to catalyze the transesterification of ethylene carbonate(EC)and MeOH to prepare the DMC,and the catalytic activities was correlated with the swelling abilities of PILs.The PIL with 3-butyl-substituent and 2.5 mol%cross-linker(poly[VBIm-VBA-DVIm]-2.5%)had the highest swelling ratio(Q=12.4(g/g))in MeOH and EC mixed solvents and exhibited excellent catalytic activities,which was similar to corresponding homogeneous ionic liquid.Furthermore,the catalyst could be reused up to seven runs without any considerable loss of its initial activity.

关 键 词：Poly(ionic liquid)s SWELLING TRANSESTERIFICATION Dimethyl carbonate METHANOL 

分 类 号：TQ225.52[化学工程—有机化工] O643.36[理学—物理化学] O645.1[理学—化学]