Method for improving concentration of methanol oxo-synthesized dimethyl carbonate crude product

Abstract

The invention relates to a method for improving concentration of a methanol oxo-synthesized dimethyl carbonate crude product, and the method comprises a first order synthetic reaction and a second order synthetic reaction; condensation and gas-liquid separation of a gas-liquid mixed material from an inlet of a first order dimethyl carbonate reactor of the first order synthetic reaction are performed; a separated liquid phase is pumped into a second order dimethyl carbonate reactor to participate into the second order synthetic reaction; and the separated CO-containing gas enters into the second order dimethyl carbonate reactor to participate into the second order synthetic reaction. The method adopts two order series of carbonyl oxidation process for co-production of dimethyl carbonate, through the adjustment of carbonyl oxidation synthesis process parameters, the concentration of the dimethyl carbonate crude product is increased to more than 30%, the difficulty of separation and purification of the dimethyl carbonate product is greatly reduced, and the production cost of the product is significantly reduced.

Description

technical field [0001] The invention belongs to the technical field of organic compound synthesis, and more specifically, the invention relates to a method for increasing the concentration of the crude product of methanol carbonylation of dimethyl carbonate. Background technique [0002] As people pay more and more attention to environmental issues, all countries in the world have put forward higher requirements for the production of chemicals, and the development of environmentally friendly green chemicals has become an inevitable trend of development. Dimethyl carbonate (DMC), as a slightly toxic and environmentally friendly green chemical product, can be used as a raw material for organic synthesis to replace phosgene, methyl chloroformate and dimethyl sulfate as carbonylation, methylation and formazan Oxygenating reagents can also be used as gasoline, diesel additives and solvents. [0003] Using methanol, carbon monoxide and oxygen as raw materials to directly oxidiz...

AI Technical Summary

Problems solved by technology

The process of synthesizing dimethyl carbonate with methanol liquid phase method contains free chlorine ions in the catalyst, so there are problems such as corrosion equipment, poor catalyst recycling and deactivation

Moreover, in the prior art, the concentration of the crude product of methanol carbonylation to dimethyl carbonate can generally only reach 5-18%, and the energy consumption of the separated and purified product is quite high, which significantly increases the production cost

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