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Device and method for producing high-concentration dimethyl carbonate

A dimethyl carbonate, high-concentration technology, applied in the purification/separation of carbonate/haloformate, organic chemistry, etc., can solve the problem of low purity of dimethyl carbonate, and achieve excellent product quality and obvious economy Effects of benefits and environmental advantages

Pending Publication Date: 2020-04-28
KAIRUI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the by-product dimethyl carbonate can only be sold as waste due to its low purity.

Method used

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  • Device and method for producing high-concentration dimethyl carbonate
  • Device and method for producing high-concentration dimethyl carbonate
  • Device and method for producing high-concentration dimethyl carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for producing high-concentration dimethyl carbonate, specifically comprising the following steps:

[0047] (1) Light removal and weight removal: the low-concentration dimethyl carbonate raw material (raw material composition, see Table 1) enters in the light removal tower through the feed port I, and is separated in the light removal tower; after separation, the tower top obtains light Components, light components are methylal and part of methanol, after being discharged from exhaust port I, condensed by condenser I to obtain liquid methylal and part of methanol enter into reflux tank I; (The reflux ratio is 56) return to the light removal tower for recycling, and the other part is connected with the methanol fuel tank; the heavy component is obtained at the bottom of the tower after separation, and the heavy component is divided into oxalate, which is discharged from the outlet I and sent into the methanol fuel tank ; The mixture of dimethyl carbonate and meth...

Embodiment 2

[0062] A method for producing high-concentration dimethyl carbonate, specifically comprising the following steps:

[0063] (1) Light removal and weight removal: low-concentration dimethyl carbonate raw material (raw material composition, see Table 3) enters in the light removal tower 1 through the feed port 1, and is separated in the light removal tower; after separation, the tower top obtains light Components, light components are methylal and part of methanol, which are discharged from the exhaust port I on the top of the tower and condensed by condenser I to obtain liquid methylal and part of methanol, and then enter the reflux tank I, and the materials in the reflux tank I Part of it is refluxed from the reflux port I (reflux ratio is 57) to the light removal tower for recycling, and the other part is sent to the methanol fuel tank; after separation, the heavy component is obtained at the bottom of the tower, and the heavy component is divided into oxalate, which is dischar...

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Abstract

The invention discloses a device and a method for producing high-concentration dimethyl carbonate. Low-concentration dimethyl carbonate is separated in a light component removal column, a part of light components is refluxed and the other part of light component and heavy components are fed into a methanol fuel tank; a mixture of dimethyl carbonate and methanol is extracted from the side line andis fed into a pressurized column; through separation in the pressurized column, high-concentration dimethyl carbonate is obtained at the column bottom and conveyed to a refining column for further purification; a methanol azeotrope containing 15-18% of dimethyl carbonate is distilled off from the column top, a part of the azeotrope is refluxed, and the other part of the methanol azeotrope is sentto an atmospheric-pressure column; through separation in the atmospheric-pressure column, an azeotrope containing dimethyl carbonate and methanol and having a concentration of 30% is distilled off from the column top, a part of the azeotrope is refluxed, and the other part of the azeotrope is sent to the pressurized column; methanol is discharged from a column bottom and conveyed into the methanolfuel tank; the high-concentration dimethyl carbonate is separated in the refining column, a part of light components is refluxed, the other part of light component and heavy components are fed into the methanol fuel tank, and high-purity dimethyl carbonate with the content of 99.9% or above is extracted from the side line to serve as a product.

Description

technical field [0001] The invention relates to a device and method for producing high-concentration dimethyl carbonate, in particular to a device and method for refining and recovering dimethyl carbonate from low-concentration dimethyl carbonate, especially a by-product from an ethylene glycol device A device and method for refining and recovering dimethyl carbonate from low-concentration dimethyl carbonate. Background technique [0002] In recent years, coal-to-ethylene glycol projects have been booming, and there are currently more than 40 coal-to-ethylene glycol projects that have been in operation and are under construction. Coal-based ethylene glycol mostly uses coal as raw material, and CO and H2 are obtained after gasification, transformation, purification, and separation and purification, in which CO is synthesized and refined by catalytic coupling to produce oxalate, and then added with H2 Ethylene glycol is obtained after hydrogen reaction and purification. The ...

Claims

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Application Information

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IPC IPC(8): C07C68/08C07C69/96
CPCC07C68/08C07C69/96
Inventor 葛立军王磐路华良
Owner KAIRUI ENVIRONMENTAL PROTECTION TECH
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