Purification method of dimethyl carbonate

A technology of dimethyl carbonate and a separation method, which is applied in the field of separation of dimethyl carbonate and methanol, can solve problems such as low product purity, and achieve the effects of good mutual solubility, low vapor pressure and stable properties
CN109422649BActive Publication Date: 2021-06-22CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2021-06-22

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Abstract

The invention relates to a separation process of dimethyl carbonate and methanol, which mainly solves the problem of low product purity in the prior art. The present invention adopts the separation method of dimethyl carbonate and methanol, the separation method is extractive distillation, and the extractive distillation adopts diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimeth One or several kinds of methyl ether as the technical solution of the extractant can obtain higher purity dimethyl carbonate and methanol products, and the extractant is rich in sources, cheap, stable in chemical properties and low in toxicity, and can be used for separation In the industrial production of dimethyl carbonate and methanol.
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Description

technical field

[0001] The present invention relates to a kind of separation method of dimethyl carbonate and methanol, in particular, 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 today's organic synthesis . In industry, transesterification is usually used to produce dimethyl carbonate. In the production process, dimethyl carbonate and methanol form an azeotrope, which is difficult to separate by ordinary rectification methods.

[0003] In recent years, extractive distillation, pressurized distillation, azeotropic distillation and membrane separation have been used to produce high-purity dimethyl carbonate. Compared with the latter three processes, extractive distillation has the adv...

Claims

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