Method and system for recovering by-products in synthesis process of dimethyl oxalate

A kind of dimethyl oxalate, technology of synthesis technique

Active Publication Date: 2018-12-14
高化学(江苏)化工新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide a recovery method and recovery system for by-products in the dimethyl oxalate synthesis process, which solves the complex recovery process of by-products in the prior art dimethyl oxalate synthesis process and the recovery system The technical problems of many equipments, high cycle times of materials, low conversion rate of by-products, and high recovery cost

Method used

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  • Method and system for recovering by-products in synthesis process of dimethyl oxalate

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Experimental program
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Effect test

Embodiment 1

[0046] The mixed by-products collected by the recovery tower are mixed with the circulating hydrogen, and the circulating hydrogen volume is 30600 Nm 3 / h, the reaction pressure is 2.80 MPa, the reaction hydrogen-ester ratio is 60, and the reaction temperature is 200°C. The conversion rates of dimethyl carbonate and methyl formate were 99.8% and 99.9%, respectively. Methanol selectivity 100%, space-time yield STY: 1079 Kg / M 3 cata.h.

Embodiment 2

[0048] The mixed by-products collected by the recovery tower are mixed with the circulating hydrogen, and the circulating hydrogen volume is 30600 Nm 3 / h, the reaction pressure is 2.0 MPa, the reaction hydrogen-ester ratio is 60, and the reaction temperature is 160°C. The conversions of dimethyl carbonate and methyl formate were 95.1 and 96.2 %, respectively. Methanol selectivity 100%, space-time yield STY: 1029 Kg / M 3 cata.h.

Embodiment 3

[0050] The mixed by-products collected by the recovery tower are mixed with the circulating hydrogen, and the circulating hydrogen volume is 30600 Nm 3 / h, the reaction pressure is 2.0 MPa, the reaction hydrogen-ester ratio is 60, and the reaction temperature is 240°C. The conversions of dimethyl carbonate and methyl formate were 99.9 and 99.9 %, respectively. Methanol selectivity 100%, space-time yield STY: 1080 Kg / M 3 cata.h.

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Abstract

The invention discloses a method for recovering by-products in a synthesis process of dimethyl oxalate. The method comprises the following steps: taking a copper-based catalyst as a reaction catalyst,carrying out an ester hydrogenation reaction on dimethyl carbonate and methyl formate in synthetic by-products of the dimethyl oxalate to convert all the by-products into methanol; and carrying out heat exchange cooling on the methanol to recycle the methanol in the synthesis step of the dimethyl oxalate. The method has the advantages that the rectifying and refining steps of the by-products in the synthesis process of the dimethyl oxalate are omitted; the process flow is simplified; the equipment investment and the raw material input are reduced; and the method is an efficient and clean recovery process. In addition, the invention also discloses a system for recovering the by-products in the synthesis process of the dimethyl oxalate. The system has the advantages that the equipment is simple; the conversion and the recovery of the methanol can be realized; the heat recovery rate of the system is high at the same time. Therefore, the system conforms to the concepts of energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of by-products in the synthesis process of dimethyl oxalate, and in particular relates to a recovery method and a recovery system for by-products in the synthesis process of dimethyl oxalate. Background technique [0002] Ethylene glycol is an important chemical raw material, mainly used in the manufacture of polyester fibers, antifreeze, nonionic surfactants, etc., and can also be used directly as a solvent. The "coal-to-ethylene glycol" process is a process that uses coal as raw material to obtain carbon monoxide (CO) and hydrogen (H 2 ). Among them, under the catalysis of noble metal catalysts, CO is synthesized and refined through oxo-coupling to obtain dimethyl oxalate (DMO), and then reacts with H under the action of the catalyst. 2 The process of hydrogenation reaction and purification to obtain polyester grade ethylene glycol. Compared with the traditional oil productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/149C07C29/136
CPCC07C29/136C07C29/149C07C31/04Y02P20/10Y02P20/50
Inventor 王佳助姚斐丁继叶
Owner 高化学(江苏)化工新材料有限责任公司
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