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A kind of production method and system of transesterification catalyst recyclable dimethyl carbonate

A technology of transesterification catalyst and dimethyl carbonate, which is applied in the field of chemical technology, can solve problems such as inability to realize online continuous recycling of catalysts, difficulty in filtration operation, easy clogging of filters, etc., and achieve easy large-scale industrial continuous production and system safety Controllable, easily recyclable effects

Active Publication Date: 2020-11-10
SINOPEC SHANGHAI ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is difficult to filter, takes a long time, and the filter efficiency is low because the filter is easy to block. Therefore, the continuous production of this method is poor, and the online continuous circulation of the catalyst cannot be realized.

Method used

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  • A kind of production method and system of transesterification catalyst recyclable dimethyl carbonate

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Experimental program
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Effect test

Embodiment 1

[0056] use as figure 1 The process flow shown produces dimethyl carbonate:

[0057] (1) Reactive distillation of ethylene carbonate and methanol to generate dimethyl carbonate product

[0058] Send ethylene carbonate, methyl alcohol and sodium methylate (i.e. transesterification catalyst) into reactive distillation column 1 by cycloalkylene carbonate input pipe, methanol circulation main pipe, transesterification catalyst circulation main pipe respectively, wherein, ethylene carbonate and The molar ratio of sodium methoxide is 5:1, the flow rate of ethylene carbonate is 1000kg / h, it is in countercurrent contact with the methanol entering from the lower part of the tower, and under the catalysis of the methanol solution of sodium methoxide entering from the upper part of the tower, the transesterification reaction is carried out , and distilled to generate dimethyl carbonate. Among them, the molar ratio of methanol to ethylene carbonate is 2:1, the operating pressure of react...

Embodiment 2

[0066] use as figure 1 The process flow shown produces dimethyl carbonate:

[0067] (1) Reactive distillation of propylene carbonate and methanol to generate dimethyl carbonate product

[0068] Send propylene carbonate, methyl alcohol and sodium methylate (i.e. transesterification catalyst) into reactive distillation column 1 by cycloalkylene carbonate input pipe, methanol circulation main pipe, transesterification catalyst circulation main pipe respectively, wherein, propylene carbonate and The molar ratio of sodium methoxide is 5:1, the flow rate of propylene carbonate is 1000kg / h, it is in countercurrent contact with the methanol entering from the lower part of the tower, and under the catalysis of the methanol solution of sodium methoxide entering from the upper part of the tower, the transesterification reaction is carried out , and distilled to generate dimethyl carbonate. Wherein, the molar ratio of methanol to propylene carbonate is 2:1, the operating pressure of rea...

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Abstract

The invention provides a production method for dimethyl carbonate with recycling of a transesterification catalyst and a system for implementing the production method. The method mainly comprises the following steps of feeding a cycloalkylene carbonate and methanol into a dimethyl carbonate synthesis unit and adding a methanol solution of the transesterification catalyst to react to form dimethyl carbonate; conveying a mixed solution output by the dimethyl carbonate synthesis unit to an evaporator; conveying mixed alcohol vapor vaporized by the evaporator to an alcohol separating column, wherein the residue of the evaporator is a saturated dihydric alcohol solution of the transesterification catalyst, and is fed back to the dimethyl carbonate synthesis unit to realize continuous on-line recycling of the transesterification catalyst. The production method for dimethyl carbonate provided by the invention and the system for implementing the production method are safe and easy to control, the energy consumption is relatively low, the product quality and the yield are stable, the equipment investment cost and the material cost are obviously reduced, therefore, the invention has wide application value and good market prospects.

Description

technical field [0001] The invention belongs to the field of chemical technology, and in particular relates to a production method of dimethyl carbonate which can be recycled as a transesterification catalyst, and a system for implementing the production method. Background technique [0002] Dimethyl carbonate (DMC) is an internationally recognized green and environmentally friendly chemical raw material that meets the requirements of modern "clean technology". It can replace highly toxic phosgene and other bulk chemical raw materials, and replace toxic solvents such as benzene. Resin, green solvents, dye intermediates, drugs, flavor enhancers, food preservatives, lubricating oil additives, cleaning oil additives and other fields are becoming more and more extensive, with very broad market development prospects, known as today's organic Synthetic "new cornerstone". [0003] The traditional DMC production method is the phosgene method, however, due to environmental issues su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C68/065C07C68/08C07C69/96
CPCC07C68/065C07C68/08C07C69/96Y02P20/584
Inventor 贾微裴凯凯陈迎刘肖肖张艺张翼徐曼
Owner SINOPEC SHANGHAI ENG
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