Method for synthesizing oxalate by CO gas-phase coupling

An oxalate ester and gas phase technology, applied in the field of regeneration technology, can solve the problems of difficult gas separation and purification, discharge pollution of nitric acid-containing wastewater, and low yield of nitrite, achieving high utilization rate, reduced investment, and short process Effect

CN102964247AActive Publication Date: 2013-03-13SOUTHWEST RES & DESIGN INST OF CHEM IND

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Authority / Receiving Office: CN · China
Current Assignee / Owner: SOUTHWEST RES & DESIGN INST OF CHEM IND
Publication Date: 2013-03-13

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Abstract

The invention discloses a method for synthesizing oxalate by CO gas-phase coupling. The regeneration technique in the invention is used for solving the problem that extra NO gas needs to be supplemented due to nitrogen loss caused by nitric acid generated in regeneration reaction. In the invention, NO and nitric acid react to provide NO2 gas to supplement nitrogen loss due to nitric acid generated by the regeneration reaction. The method can recycle the nitric acid generated in the regeneration reaction, so that the utilization ratio of NO is kept at 98% above; and meanwhile, the invention solves the problem of pollution of discharge of nitric-acid-containing wastewater generated by the regeneration reaction.

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Description

technical field

[0001] The present invention relates to a method for CO gas-phase coupling synthesis of oxalate, in particular to the regeneration process in the production process of CO gas-phase coupling synthesis of oxalate, which is used to solve the loss of nitrogen caused by the generation of nitric acid in the regeneration reaction and requires additional The problem of supplementing NO gas. Background technique

[0002] As a degradable and environmentally friendly engineering plastic monomer, oxalate has attracted more and more international attention, and it is also an important organic chemical raw material, widely used in the production of various dyes, medicines, important solvents, extractants and other fields. In addition, with the depletion of petroleum resources, the non-petroleum route of synthesizing ethylene glycol from oxalate esters using syngas as raw material is becoming more and more popular. my country is a big consumer of ethylene glycol. In 2010, ...

Claims

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