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Method and device for producing and synthesizing ethylene glycol by using coal as raw material

A technology for ethylene glycol and raw materials, applied in the field of synthetic ethylene glycol production, can solve the problems of equipment corrosion, low rate of high-quality products, and failure to reach high-quality products, avoiding enrichment, improving the rate of high-quality products, The effect of avoiding corrosion

Active Publication Date: 2014-01-01
PUJING CHEM IND SHA
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Problems solved by technology

[0003] At present, the ethylene glycol plant built in China does not have a high rate of high-grade products or has not yet reached the high-grade products. After in-depth technical discussions, one of the main reasons is the process from the top of the oxidation esterification tower in the oxidation esterification section. The gas contains a large amount of saturated water, which enters the carbonylation reactor, and the reaction product dimethyl oxalate decomposes with water to produce oxalic acid, which has a great corrosion effect on the equipment and affects the high-grade product rate and quality of the final product ethylene glycol

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  • Method and device for producing and synthesizing ethylene glycol by using coal as raw material
  • Method and device for producing and synthesizing ethylene glycol by using coal as raw material

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[0013] For further illustrating the present invention, specifically illustrate in conjunction with following examples:

[0014] Such as figure 1 As shown, a method for producing synthetic ethylene glycol with coal as raw material, including oxidative esterification process, carbonylation process and dimethyl oxalate hydrogenation ethylene glycol process, also includes drying and purification equipment, the drying and purification equipment The method is to dry the saturated water in the process gas from the oxidative esterification tower before entering the carbonylation reactor. The working process of the drying and purification equipment specifically includes: the process gas from the top of the oxidation esterification tower T01 is cooled by the cooler E01, and then enters the process gas drying and purification equipment D-01 to absorb saturated water in the process gas, making it enter The moisture contained before carbonylation reactor R-01 is reduced to 10-100ppm.

[...

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Abstract

The invention relates to a method for producing and synthesizing ethylene glycol by using coal as a raw material, which comprises an oxidation and esterification procedure, a carbonylation procedure and a procedure of ethylene glycol preparation through dimethyl oxalate hydrogenation, and further comprises a drying and purifying apparatus, wherein the drying and purifying apparatus is used for drying saturated water in process gas coming out from an oxidation and esterification tower before the process gas enters a carbonylation reactor. The method avoids enrichment of methyl nitrite (MN) in the process gas in an adsorption tower in the regeneration process and harmful emission of regeneration gas, avoids apparatus corrosion caused by oxalic acid formed by hydrolysis of the carbonylation reaction product dimethyl oxalate (DMO), provides a guarantee for long-period operation of the apparatus and improves the high-quality product rate of the final product ethylene glycol.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a method and device for producing synthetic ethylene glycol using coal as a raw material. Background technique [0002] The process route of producing synthetic ethylene glycol from coal is mainly divided into oxidative esterification process, carbonylation process, and hydrogenation of dimethyl oxalate to ethylene glycol. First is O 2 , NO and methanol undergo esterification reaction to synthesize the intermediate product methyl nitrite (MN), followed by the raw material gas CO produced from coal as the raw material, after purification treatment, and the methyl nitrite (MN) generated by the esterification reaction to generate carbonyl The intermediate product dimethyl oxalate (DMO) is synthesized by chemical coupling reaction, and finally dimethyl oxalate (DMO) is hydrogenated to obtain ethylene glycol products. [0003] At present, the ethylene glycol plant built in China do...

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Application Information

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IPC IPC(8): C07C31/20C07C29/149
CPCC07C29/149C07C67/36C07C201/04C07C31/202C07C203/00C07C69/36
Inventor 赵平程勇张健堂
Owner PUJING CHEM IND SHA
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