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Method for removing CO to prepare nitrogen oxides in oxalate exhaust tail gas

A technology of nitrogen oxides and oxalates, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles, can solve the problems of incomplete treatment of alkyl nitrite, and achieve lower content, less pollution, and good technology effect of effect

Active Publication Date: 2011-12-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, there is also the problem that alkyl nitrite is not handled thoroughly in this method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take by weighing 1000 grams of ZSM-5 molecular sieve adsorbent, put it into a tubular reactor with an internal diameter of 50 millimeters, and discharge tail gas whose volume content is 0.8% and methyl nitrite containing nitrogen of 4% and surplus, At a temperature of -10°C, a pressure of 0.1MPa, and a volumetric space velocity of 500 hours -1 Adsorption is carried out through the adsorption bed under certain conditions, and the adsorption results are: the content of NO in the exhaust tail gas is 6ppm, and the content of methyl nitrite is 5ppm.

Embodiment 2

[0017] Take by weighing 1000 grams of ZSM-5 molecular sieve adsorbent, put it into a tubular reactor with an internal diameter of 50 millimeters, and discharge the tail gas whose volume content is 2% and methyl nitrite containing nitrogen of 2% and surplus, At a temperature of -5°C, a pressure of 0.2 MPa, and a volumetric space velocity of 800 hours -1 Adsorption is carried out through the adsorption bed under certain conditions, and the adsorption results are: the content of NO in the exhaust tail gas is 10ppm, and the content of methyl nitrite is 6ppm.

Embodiment 3

[0019] Take by weighing 1000 grams of mordenite molecular sieve adsorbents, put into a tubular reactor with an internal diameter of 50 millimeters, and use volume content to contain NO as 3% and methyl nitrite as the discharge tail gas of 1% and surplus nitrogen. The temperature is 5°C, the pressure is 0.4MPa, and the volume space velocity is 1000 hours -1 Adsorption is carried out through the adsorption bed under certain conditions, and the adsorption results are: the content of NO in the exhaust tail gas is 15ppm, and the content of methyl nitrite is 8ppm.

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Abstract

The invention relates to a method for removing CO to prepare nitrogen oxides in oxalate exhaust tail gas, which mainly solves the technical problem of low removal rate of nitrogen oxides or nitrite in the prior art. In the present invention, the exhaust gas stream containing nitrogen oxides is passed through an adsorption bed under the conditions of a temperature of -20 to 100° C., a pressure of 0.1 to 3.0 MPa, and a volumetric space velocity of 100 to 5000 hours -1 , and the adsorbent is mixed with the adsorbent. Contact, obtain the effluent of removing nitrogen oxides after adsorption, wherein, adsorbent is selected from the technical scheme of at least one in ZSM type molecular sieve, 5A molecular sieve, beta zeolite or mordenite, solves this problem well, available It is used in the industrial production of nitrogen oxides in the exhaust gas of oxalate by removing CO.

Description

technical field [0001] The invention relates to a method for removing CO to prepare nitrogen oxides in the exhaust tail gas of oxalate esters, in particular to a method for removing nitrogen oxides in the exhaust tail gas for CO coupling production of dimethyl oxalate or diethyl oxalate. Background technique [0002] Oxalate is an important organic chemical raw material, which is widely used in the fine chemical industry to produce various dyes, medicines, important solvents, extractants and various intermediates. In the 21st century, oxalate, as a degradable and environmentally friendly engineering plastic monomer, has received extensive international attention. In addition, oxalic acid can be obtained by normal pressure hydrolysis of oxalate, and oxalamide can be obtained by normal pressure ammonia solution. Oxalate can also be used as a solvent to produce pharmaceutical and dye intermediates, etc., such as various condensation reactions with fatty acid esters, cyclohexyl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/02
Inventor 刘俊涛孙凤侠张惠明
Owner CHINA PETROLEUM & CHEM CORP