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Method of synthesizing ammonia by hydrogen gas purified by tail gas of sodium cyanide and alkali-chloride production

A technology for synthesizing sodium cyanide and ammonia, which is applied in the preparation/separation of ammonia, hydrogen separation and other directions, and achieves the effects of simple method, improved economic benefit and easy implementation

Inactive Publication Date: 2007-08-15
营口德瑞化工有限公司
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method of utilizing the tail gas of producing sodium cyanide and chlor-alkali to produce hydrogen and then synthesize ammonia with nitrogen, so as to solve various problems existing in the existing method

Method used

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Examples

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Embodiment Construction

[0013] Take the annual production of 20,000 tons of synthetic ammonia as an example:

[0014] 1. Production method

[0015] First remove the trace amount of sulfur and oxygen contained in the two tail gases, then send them into the gas cabinet for pressure treatment, and then produce hydrogen by pressure swing adsorption. Pure nitrogen is obtained from air by pressure swing adsorption. The two prepared gases are pressurized by a compressor according to a certain ratio, and then sent to the ammonia synthesis tower to generate ammonia NH under the action of an iron catalyst. 3 .

[0016] Sodium cyanide tail gas comes out directly through the buffer in the production system during production, and is sent to the water ring vacuum booster pump through the pipeline. Because the sodium cyanide production system is under negative pressure, the temperature of the tail gas when it comes out of the buffer is 70°C, the pressure is -0.034Mpa, and then cooled to 30°C by the cooler. The ...

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Abstract

The invention discloses a synthesizing method of ammonia through purifying hydrogen from tail gas of sodium cyanide and alkali-chloride, which is characterized by the following: adopting natural gas, benzine naphtha and coal carbon as raw material; making nitrogen to synthesize ammonia with nitrogen; protecting environment without polluting; saving power; preparing hydrogen through pressurizing, heating, removing impurity and deoxidizing.

Description

technical field [0001] The invention relates to the field of research and development of ammonia synthesis using tail gas from the production of sodium cyanide and chlor-alkali. Background technique [0002] At present, it is used to produce synthetic ammonia, which is produced by using natural gas, naphtha (or crude oil), coal and coke as raw materials, but the existing production process is relatively complicated and the production cost is high. In addition, a large amount of vent gas and vent air are produced during production, and the gas contains ammonia and hydrogen, which need to be reprocessed, otherwise it will cause serious environmental pollution. Therefore say that present production synthetic ammonia method is not very ideal. In addition, for enterprises that produce both sodium cyanide and chlor-alkali, a large amount of tail gas containing hydrogen and a small amount of oxygen, nitrogen, carbon monoxide, and carbon dioxide is now discharged into the atmospher...

Claims

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Application Information

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IPC IPC(8): C01C1/04C01B3/50
Inventor 刘庆晨安宝均刘至柔王瑞民张久福
Owner 营口德瑞化工有限公司
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