Device for producing dimethyl carbonate by transesterification method and using method thereof

Abstract

The ester exchange method dimethyl carbonate production device provided by the invention is provided with two tubular ester exchange reactors which are connected in series for use, and a product separation tower is arranged between the two ester exchange reactors; a fresh raw material propylene (ethylene) carbonate enters the first transesterification reactor, a fresh raw material methanol entersthe second transesterification reactor, and the two transesterification reactors have high reaction driving force. The reaction effect far exceeding the equilibrium conversion rate can be obtained byusing the total feed composition close to the theoretical molar ratio, and the unconverted propylene (ethylene) carbonate and methanol are separated and recycled. The problems of overhigh energy consumption and complex operation control caused by pursuit of excessive methanol in the propylene (ethylene) carbonate conversion rate in the dimethyl carbonate production operation of the traditional reactive distillation column transesterification method are solved. The device is high in production efficiency, good in product quality, low in energy consumption and high in operation flexibility, andthe production process is easy to control.

Description

technical field [0001] The invention relates to a production device of chemical products and a method for using the same, in particular to a device for producing dimethyl carbonate by transesterification and a method for using the same. Background technique [0002] Dimethyl carbonate (DCM) is a basic organic chemical raw material, known as a green organic chemical facing the 21st century. The methods for producing dimethyl carbonate include methanol phosgene method, sodium methoxide phosgene method, methanol oxidative hydroxylation method, methanol and carbon monoxide electrochemical reaction method, carbon dioxide and methanol supercritical synthesis method, urea alcoholysis method, transesterification method, etc. Some of the above methods have been industrialized, and some are still under development and exploration. [0003] Use propylene oxide or ethylene oxide and carbon dioxide as raw materials to synthesize propylene carbonate or ethylene carbonate under the action...

AI Technical Summary

Problems solved by technology

The transesterification reaction of propylene carbonate or ethylene carbonate and methanol is a reversible reaction. The traditional production method is to make the reaction in a reactive distillation column. In order to pursue a higher conversion rate of propylene carbonate or ethylene carbonate, a large amount of methanol is used. Excessive operation, the energy consumption of these excess methanol recovery is high, the production efficiency of the device is low, and the operation control is complicated

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