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Purification method of dimethyl carbonate

A technology for the separation of dimethyl carbonate and methanol, which is applied in the field of separation of dimethyl carbonate and methanol, can solve the problems of low product purity, and achieve the effects of high separation efficiency, stable properties, and low vapor pressure

Active Publication Date: 2019-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of low product purity in the prior art; an environmentally friendly separation method of dimethyl carbonate and methanol is provided, which has the advantages of good separation effect and high product purity

Method used

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  • Purification method of dimethyl carbonate
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Experimental program
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Effect test

Embodiment 1

[0025] Such as figure 2 The extractive distillation process shown. The extractive distillation column has 40 theoretical trays (the number of trays is counted from top to bottom), and the extractant diethylene glycol dimethyl ether is added from the 4th tray, and the flow rate is 500kg / h, and the raw material dimethyl carbonate and The mixture of methanol is added from the 35th tray, the content of dimethyl carbonate is 30wt%, the content of methanol is 70wt%, the total flow is 100kg / h, and the mass ratio of extractant to raw material is 5 at this moment. The extractive distillation tower is operated under normal pressure, the top of the tower is fully condensed, the reflux ratio is 1.6, the output of the tower top is 70.1kg / h, and 99.75wt% of methanol can be obtained. The product of the extractive distillation tower is pumped to the solvent recovery tower, the number of theoretical plates is 20, the operating pressure is normal pressure, the top of the tower is fully conden...

Embodiment 2

[0027] Such as figure 2 The extractive distillation process shown. The extractive distillation column has 40 theoretical trays (the number of trays is counted from top to bottom), and the extractant triethylene glycol dimethyl ether is added from the 4th tray, and the flow rate is 500kg / h, and the raw material dimethyl carbonate and The mixture of methanol is added from the 35th tray, the content of dimethyl carbonate is 30wt%, the content of methanol is 70wt%, the total flow is 100kg / h, and the mass ratio of extractant to raw material is 5 at this moment. The extractive distillation tower is operated under normal pressure, the top of the tower is fully condensed, the reflux ratio is 1.6, the output of the tower top is 70kg / h, and 99.76wt% of methanol can be obtained. The product in the extractive distillation tower is pumped to the solvent recovery tower, the number of theoretical plates is 20, the operating pressure is normal pressure, the top of the tower is fully condens...

Embodiment 3

[0029] Such as figure 2 The extractive distillation process shown. The extractive distillation column has 40 theoretical trays (the number of trays is counted from top to bottom), and the extractant triethylene glycol dimethyl ether is added from the 4th tray, and the flow rate is 700kg / h, and the raw material dimethyl carbonate and The mixture of methanol is added from the 35th tray, the content of dimethyl carbonate is 30wt%, the content of methanol is 70wt%, the total flow rate is 100kg / h, and the mass ratio of extractant to raw material is 7 at this moment. The extractive distillation tower is operated under normal pressure, the top of the tower is fully condensed, the reflux ratio is 1.3, the output of the tower top is 70kg / h, and 99.8wt% of methanol can be obtained. The product in the extractive distillation tower is pumped to the solvent recovery tower, the number of theoretical plates is 20, the operating pressure is normal pressure, the top of the tower is fully con...

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Abstract

The invention relates to a separation process of dimethyl carbonate and methanol, and mainly solves the problem that product purity is low in the prior art. According to the method, a separation method of dimethyl carbonate and methanol is adopted, the separation method is extraction rectification, a technical scheme that one or more selected from diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether are used as extraction agents for extraction rectification is adopted, and dimethyl carbonate and methanol products with relatively high purity can be obtained. In addition, the extraction agent is rich in source, low in price, stable in chemical property and low in toxicity, and can be used for industrial production for separating dimethyl carbonate with methanol.

Description

technical field [0001] The present invention relates to a kind of separation method of dimethyl carbonate and methanol, specifically, relate to a kind of extractive distillation separation method of dimethyl carbonate and methanol. Background technique [0002] Dimethyl carbonate (DMC) is an environmentally friendly chemical intermediate widely used in reactions such as methylation, carbonylation, carbonylmethylation and methoxylation, and is known as the "new cornerstone" of organic synthesis today . In industry, transesterification is usually used to produce dimethyl carbonate. During the production process, dimethyl carbonate and methanol form an azeotrope, which is difficult to separate by ordinary distillation methods. [0003] In recent years, technologies such as extractive distillation, pressurized distillation, azeotropic distillation and membrane separation have been used to produce high-purity dimethyl carbonate. Compared with the latter three processes, extract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/08C07C69/96C07C29/84C07C31/04B01D3/40
CPCB01D3/40C07C29/84C07C68/08C07C69/96C07C31/04
Inventor 李骏何文军戈军伟王意
Owner CHINA PETROLEUM & CHEM CORP
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