Protic ionic liquid-promoted synthesis of dimethyl carbonate from ethylene carbonate and methanol  

作　　者：Yu Song Xing He Bing Yu Hong-Ru Li Liang-Nian He 

机构地区：[1]State Key Laboratory and Institute of Elemento-Organic Chemistry,Nankai University,Tianjin 300071,China [2]College of Chemistry and Molecular Engineering,Zhengzhou University,Zhengzhou 450001,China [3]College of Pharmacy,Nankai University,Tianjin 300353,China

出　　处：《Chinese Chemical Letters》2020年第3期667-672,共6页中国化学快报（英文版）

基　　金：the Ministry of Science and Technology of China(National Key Research and Development Program,No.2016YFA0602900);the National Natural Science Foundation of China(No.21672119)for financial support。

摘　　要：In this work,the protic ionic liquid[DBUH][Im](1,8-diazabicyclo[5.4.0]-7-undeceniumimidazolide)was developed as an efficient catalyst for the transesterification of ethylene carbonate with methanol to produce dimethyl carbonate.At 70℃,up to 97%conversion of ethylene carbonate and 91%yield of dimethyl ca rbonate were obtained with 1 mol%[DBUH][Im](relative to ethylene carbonate)as catalyst in 2 h.Even at room temperature,the conversion of ethylene carbonate can reach 94%and the yield of dimethyl carbonate can approach 81%for 6 h.Catalytic mechanism investigation showed the high catalytic efficiency of this ionic liquid results from the synergistic activation effect,wherein the cation can activate ethylene carbonate and the anion can activate methanol through hydrogen bond formatio n.Although the reusability of the ionic liquid need to be further improved,high efficiency and comme rcial availability of[DBUH][Im]render it a promising catalyst for the preparation of dimethyl carbonate.

关 键 词：DIMETHYL CARBONATE TRANSESTERIFICATION Protic IONIC liquid SYNERGISTIC effect Sustainable chemistry 

分 类 号：O643.36[理学—物理化学] O623.624[理学—化学]