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Process for nitrous oxide purification

A nitrous oxide, carbon monoxide technology, applied in the directions of nitrous oxide, nitrous oxide capture, chemical instruments and methods, etc., can solve the problems of pollution of nitrous oxide, waste, etc.

Inactive Publication Date: 2002-07-31
阿申德高新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The emission of nitrous oxide exhaust gas in the atmosphere will cause pollution and is a waste of nitrous oxide

Method used

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  • Process for nitrous oxide purification
  • Process for nitrous oxide purification
  • Process for nitrous oxide purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0027] A kind of method of purifying nitrous oxide gas of the present invention is carried out as follows:

[0028] 0.2% (w / w) palladium on a beaded alumina catalyst from Johnson-Matthey was exposed to 60 cubic centimeters per minute (containing 2.4 cubic centimeters of oxygen at 36 cubic centimeters of nitrous oxide and 6 cubic centimeters of helium). The contact time was 4.6 seconds. Part of the helium is gradually replaced by pure hydrogen. Reaction Tracking Reactor effluents were analyzed by mass spectrometry (oxygen atomic mass units 32, 28, 30 and nitrous oxide atomic mass units 44, hydrogen atomic mass units 2, water atomic mass units 18). Complete hydrogen reaction was observed in all test examples. figure 1 and figure 2 The selective reaction of oxygen with hydrogen but not with nitrous oxide, respectively, is shown. figure 1 showing the destruction of oxygen as a function of hydrogen flow, figure 2 Shows the percent reduction in nitrous oxide as a function of...

Embodiment II

[0030] The same experiment was carried out at 25°C with a contact time of 0.7 seconds and the gas flow composition and rate as before. Figure 4 and Figure 5 shows the performance obtained under this condition. Figure 4 shows the reduction of oxygen as a function of hydrogen flow, Figure 5 The percent reduction in nitrous oxide as a function of hydrogen flow is shown. Image 6 The selectivity of oxygen reduction as a function of hydrogen flow is demonstrated.

Embodiment III

[0032] The same experiment was carried out at 25°C with a contact time of 0.7 seconds and the gas flow composition and rate as before. But part of the hydrogen is replaced by CO (ie nearly 50% by volume of CO). The results in terms of oxygen reduction and selectivity are the same as those obtained with pure hydrogen.

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Abstract

A method for purification of a nitrous oxide gas by feeding the nitrous oxide gas and a reducing agent into a de-oxidation reactor, performing de-oxidation by reacting the reducing agent with oxygen using a catalyst in order to deplete the oxygen in the nitrous oxide gas, while limiting the amount of nitrous oxide removed from the nitrous oxide gas.

Description

field of invention [0001] The present invention relates to a method for purifying nitrous oxide by removing various impurities. Background of the invention [0002] Various methods of purifying exhaust and tail gases produced by some thermal power plants are well known in the art. Such exhaust gas contains undesirable components such as NO X (including NO, N 2 o 3 , NO 2 , N 2 o 4 , N 2 o 5 Nitrogen oxides, etc.), sulfur oxides, etc. These methods are based either on absorbing these impurities with liquid absorbents or on converting (reducing) them into harmless compounds such as NO X reduced to water vapor and nitrogen). The most widely used reduction NO X The best way is to use ammonia and selective catalytic reduction (SCR). Selective catalytic reduction makes NO X Reduction to elemental nitrogen and water vapor is possible. 4,859,439; 4,855,115; 4,789,533; 4,438,082; 4,720,476; 4,695,438; 4,732,743; 4,975,256; 4,521,388; The exhaust g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01J23/44C01B21/22
CPCY02C20/10B01D53/8671C01B21/22B01D53/8625C01P2006/80Y02P20/151
Inventor P·诺特B·L·鲍曼J·P·奥彭海姆A·S·诺斯科夫R·钱德拉塞克哈G·克罗斯
Owner 阿申德高新材料有限责任公司
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