Method for synthesizing dimethyl carbonate and co-producing ethylene glycol through transesterification reaction catalyzed by a loaded ionic liquid

Abstract

The invention belongs to the technical field of industrial catalysis and provides a method for synthesizing dimethyl carbonate and co-producing ethylene glycol by catalyzing transesterification with a loaded ionic liquid. The supported ionic liquid is based on chlorine-containing resin particles as a carrier, and an ionic liquid in which a hydroxyl anion structural unit and an imidazolium cation structural unit are paired as a catalytic active center, and is supported by a chemical bond to prepare a functionalized supported ionic liquid catalyst. It is used to catalyze the transesterification reaction of ethylene carbonate and methanol to simultaneously synthesize two chemical products of dimethyl carbonate and ethylene glycol. The catalyst preparation process is simple and easy to operate, and the catalyst can be recovered by simple filtration, which is very beneficial to solve the problem of difficult separation of the product and the catalyst. It will have great application potential and market prospect.

Description

technical field [0001] The invention belongs to the technical field of industrial catalysis, and relates to a method for catalytically synthesizing dimethyl carbonate and co-producing ethylene glycol with a loaded ionic liquid, specifically referring to a method that uses ethylene carbonate and methanol as raw materials, and is catalyzed by a loaded ionic liquid. A method for synthesizing dimethyl carbonate and co-producing ethylene glycol by exchange reaction. Background technique [0002] Dimethyl carbonate is a green chemical basic raw material with low toxicity and high activity. A multifunctional organic synthesis research platform using dimethyl carbonate [Zhang SJ, Chen YH, Li FW et al.Fixation and conversion of CO 2 using ionic liquids.Catalysis Today,2006,115:61-69.], by transesterification [Kim WB, Lee JS.Anew process for the synthesis of diphenyl carbonate from dimethyl carbonate and phenol over heterogeneous catalyst.Catal.Lett., 1999,59(1):83-88.], Methylation...

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Problems solved by technology

[0003] At present, there are two kinds of catalysts for transesterification that have been reported: one is alkali metal or alkali metal salt [Buysch HJ, Krimm H, Rudolph H.US Pat 4181676 (1980).] and traditional ionic liquid [Dharman MM, Ju HY, Shim HL, Lee MK, Kim KH, Park DW.Significant influence of microwavedielectric heating on ionic liquid catalyzed transesterification of ethylenecarbonate with methanol.J.Mol.Catal.A:Chem.,2009,303:96-101.] etc., the catalytic activity shown is generally not high, the separation of the product and the catalyst is difficult, and the subsequent product purification process is complicated; the second is that the heterogeneous catalyst includes metal oxides such as CaO, MgO, ZnO, Fe 2 o 3 Or their mixtures [Urano Y, Kirishikik M, Onda Y, Tsuneki H. US Pat 5430170 (1995).] and quaternary amines or phosphines supported by amorphous inorganic materials, SBA-15, MCM-41, etc. Ionic liquid catalyst [Cho HJ, Kwon HM, Tharun J, Park DW.Synthesis of glycerol carbonate from ethylene carbonate and glycerol using immobilizedionic liquid catalysts.J.Ind.Eng.Chem.,2010,16:679-683; Kim DW, Kim CW, Koh JC, Park DW.Synthesis of dimethyl carbonate from ethylene carbonate and methanolusing immobilized ionic liquid on amorphous silica.J.Ind.Eng.Chem.,2010,16:474-478], although this can solve the separation of catalyst However, due to the lack of good compatibility between the substrate and the catalyst, the catalytic activity shown is generally not high, and the inert gas CO is generally required 2 Only under the condition of pressurization (0.51~1.34MPa) can it be carried out smoothly

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