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Method for removing nitrite ester in tail gas of production of oxalate through CO coupling

A technology for coupling oxalate and nitrite, applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of high nitrogen oxide concentration and low nitrite removal rate.

Active Publication Date: 2014-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of low nitrite removal rate and high concentration of nitrogen oxides in the tail gas existing in the prior art. Nitrate Method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Fully mix tail gas with 1% methyl nitrite content and reducing gas ammonia in a fixed-bed reactor, at a volume space velocity of 3000 hours -1 , the reaction temperature is 250°C, the reaction pressure is 0.2MPa, the molar ratio of reducing gas ammonia to methyl nitrite is 1, and the source of reducing gas ammonia is liquid ammonia. The catalyst is based on alumina as a carrier, the active component is selected from copper oxides, and the auxiliary agent is selected from manganese. Based on the carrier, the amount of copper oxides selected from the weight of copper is 20% by weight. Based on the weight of the additive manganese, the amount of oxides selected from manganese is 3% by weight, the conversion rate of methyl nitrite is 100%, and the content of nitrogen oxides in the tail gas is 5ppm.

[0013]

Embodiment 2

[0015] Fully mix tail gas with 2% ethyl nitrite content and reducing gas ammonia in a fixed-bed reactor, at a volume space velocity of 1000 hours -1 , the reaction temperature is 200°C, the reaction pressure is 0.3MPa, the molar ratio of reducing gas ammonia to ethyl nitrite is 1, the source of reducing gas ammonia is urea solution, and the concentration of urea solution is 50% The copper catalyst is contacted and fully reacted. The copper-containing catalyst uses alumina as a carrier, the active component is selected from copper oxides, and the auxiliary agent is selected from manganese and iron. Based on the carrier, based on the weight of elemental copper, selected from the oxidation of copper The amount of material used is 6% by weight, based on the weight of the additive elemental metal, the amount of oxides selected from manganese is 5% by weight, the amount of oxides selected from iron is 10% by weight, sub The conversion rate of ethyl nitrate is 100%, and the content o...

Embodiment 3

[0018] The tail gas with a methyl nitrite content of 0.3% and the reducing gas ammonia are fully mixed in a fixed bed reactor, and the volume space velocity is 300 hours -1 , the reaction temperature is 220°C, the reaction pressure is 0.5MPa, the molar ratio of reducing gas ammonia to methyl nitrite is 0.95, and the source of reducing gas ammonia is liquid ammonia. The catalyst is supported by alumina and silicon oxide (60% of which is alumina), the active component is selected from copper oxide, and the additive is selected from nickel. Based on the support, the weight of elemental copper is selected from the oxide of copper. The amount of substance used is 15% by weight, based on the weight of the nickel additive, the amount of oxides selected from nickel is 7% by weight, the conversion rate of methyl nitrite is 100%, and the nitrogen oxides in the exhaust gas The content is 30ppm.

[0019]

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PUM

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Abstract

The invention relates to a method for removing nitrite ester in tail gas of production of oxalate through CO coupling. The problems of low nitrite ester removal rate and high concentration of nitrogen oxides in the tail gas existing in the prior art are solved in the invention. The nitrite ester-containing tail gas generated in the production of oxalate through CO coupling contacts ammonia under the action of a copper-containing catalyst in a fixed bed reactor under a tail gas volume air speed of 180-10000h<-1> at a reaction temperature of 150-350DEG C under a reaction pressure of 0.1-0.8MPa, and a molar ratio of ammonia to nitrite ester is 0.6-1.2. The above technical scheme well solves the problems, and the method can be used in the industrial production for removing nitrite ester in tail gas of production of oxalate through CO coupling.

Description

technical field [0001] The invention relates to a method for removing nitrite in the tail gas of CO-coupling oxalate production, in particular to a method for removing methyl nitrite in the tail gas of CO-coupling for dimethyl oxalate production. Background technique [0002] Oxalate is an important chemical raw material, which can be used to prepare oxalic acid, ethylene glycol, carbonate, oxamide, intermediates of drugs and dyes, plastic accelerators and solvents, etc. In addition, low-pressure hydrogenation of oxalate can produce ethylene glycol, an important chemical raw material. In recent years, although the production capacity and output of ethylene glycol in my country have grown rapidly, due to the strong demand of polyester and other industries, it still cannot meet the growing demand of the domestic market, and a large amount of imports have to be made every year. In 2010 (1-10 ) The monthly import volume was 5.5867 million tons. [0003] At present, the producti...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/72
Inventor 孙凤侠赵焱
Owner CHINA PETROLEUM & CHEM CORP
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