Catalyst for synthesizing dimethyl carbonate by methanol liquid-phase oxidative carbonylation and methods

Abstract

The invention discloses a catalyst for synthesizing dimethyl carbonate by methanol liquid-phase oxidative carbonylation and methods. The catalyst comprises a copper halide and an ionic liquid; the mass ratio of the copper halide to the ionic liquid is 1:(1-10); a cation of the ionic liquid is an imidazole cation, a quaternary ammonium salt cation or a pyridine cation; and an anion of the ionic liquid is a halogen ion. The catalyst disclosed by the invention has relatively high methanol conversion ratio and high dimethyl carbonate selectivity and has an industrial application prospect. In addition, due to the addition of the ionic liquid, corrosion to stainless steel reaction equipment can be relieved.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a catalyst and a method for synthesizing dimethyl carbonate by methanol liquid-phase oxidative carbonylation. Background technique [0002] Since dimethyl carbonate (DMC) was listed as a non-toxic chemical by Europe in 1992, its synthesis method and application field have been continuously expanded. Dimethyl carbonate contains groups such as carbonyl, methyl, methoxy, carboxyl and methoxycarbonyl, and has good reactivity; it can also be used as a solvent for paint solvents and solvents in the pharmaceutical industry; The use of tert-butyl ether as a gasoline additive has very broad prospects. It is considered to be a green basic chemical raw material in the 21st century, and its development will play a huge role in coal chemical industry and methanol chemical industry [Energy & Fuels, 1997, 11:2-29]. [0003] The preparation methods of dimethyl carbonate include phosgene metho...

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Problems solved by technology

Patent CN1962602A reports copper halide as catalyst and ionic liquid as reaction solvent, and its ionic liquid is mainly pyridine tetrafluoroborate ionic liquid, such as N-picoline tetrafluoroborate, N-ethylpyridine tetrafluoroborate Borate, N-butylpyridine tetrafluoroborate, N-hexylpyridine tetrafluoroborate, N-octylpyridine tetrafluoroborate, 3-methyl-N-butylpyridine tetrafluoroborate salt, 4-methyl-N-butylpyridine tetrafluoroborate, 3-ethyl-N-butylpyridine tetrafluoroborate, N-butylpyridine hexafluorophosphate, N-butylpyridine chloride Compound, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-2,3-dimethylimidazolium tetrafluoroborate, can realize catalyst and product, reactant Simple and effective separation, ionic liquid can be reused, but the catalyst activity is not high, and the single-pass conversion rate of methanol is only 10% to 20%.