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Environmental-protection cleaning technology for producing hydrocyanic acid derivatives by comprehensive utilization of coke oven gas

A technology of coke oven gas and process method, which is applied in the production of hydrogen/synthesis gas, preparation of organic compounds, cyanide, etc., can solve the problems of insignificant investment benefit, narrow application fields of downstream products, and low construction efforts, etc. Good economic and social benefits, abundant raw material guarantee, and the effect of saving purification costs

Inactive Publication Date: 2013-01-30
李宽义
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the construction unit is concerned, if it has a coke production capacity of 1 million tons / year, it will generate about 200 million Nm of surplus coke oven gas every year 3 , if the torch is burned and discharged into the atmosphere, it will cause a lot of waste of energy
[0003] The traditional utilization method of coke oven gas is detarring, naphthalene, benzene and H 2 S is later used as civil fuel gas or power generation, so that not only the precious chemical raw materials are burned and wasted, but also CO 2 , SO 2 and NOn, still pollute the environment
At this stage, relevant coking enterprises plan to use coke oven gas to synthesize methanol and ammonia after purification treatment, and then further use it in the production of downstream products, so that the by-product coke oven gas can exert economic benefits and reduce emission pollution; but due to coke oven gas The equipment used to synthesize methanol and ammonia after purification treatment has relatively large investment, the added value of synthetic ammonia and synthetic methanol is not high, the application field of downstream products is narrow and the added value is limited, and the investment benefit is not obvious, so the construction efforts are not large

Method used

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  • Environmental-protection cleaning technology for producing hydrocyanic acid derivatives by comprehensive utilization of coke oven gas
  • Environmental-protection cleaning technology for producing hydrocyanic acid derivatives by comprehensive utilization of coke oven gas
  • Environmental-protection cleaning technology for producing hydrocyanic acid derivatives by comprehensive utilization of coke oven gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: coke oven gas: hydrogen 57.6%, methane 27.3%, carbon monoxide 5.8%, carbon dioxide 1.4%, oxygen 0.4%, nitrogen 4.1%, water 1.0%, other 2.4%, through pressure swing adsorption and other auxiliary separation devices Separation to obtain hydrogen, carbon monoxide, methane gas and tail gas respectively; hydrogen is used to synthesize ammonia or hydrogenation of derivatives, carbon monoxide and tail gas are used to synthesize methanol and then oxidized to obtain formaldehyde, and methane gas is used to synthesize hydrogen cyanide by Angler's ammoxidation.

[0041] The components of methane gas obtained by separation of coke oven gas:

[0042] serial number component name Component ratio% serial number component name Component ratio% 1 CH 4 93.379 6 CO 2 0.413 2 H 2 3.978 7 CO 0.833 3 h 2 o 0.112 8 Ar 0.046 4 N 2 1.013 9 other 0.124 5 O 2 0.102 10

[0043] Utilize above-mentioned sepa...

Embodiment 2

[0059] Example 2: Same as Example 1, using the above coke oven gas separation to obtain methane gas through Angle's ammoxidation synthesis reaction to obtain synthesis gas; the reaction synthesis gas is obtained through joint removal of ammonia. Reaction synthesis gas containing no ammonia or trace amounts of ammonia ; The synthesis gas after ammonia removal is absorbed with formaldehyde solution to obtain high-purity hydroxyacetonitrile aqueous solution, which is used to synthesize high-purity hydrocyanic acid derivatives.

[0060] The composition of the synthesis gas is as follows:

[0061] serial number component name Component ratio% serial number component name Component ratio% 1 HCN 8.092 6 N 2 54.308 2 NH 3 1.503 7 CO 2 0.523 3 h 2 o 25.518 8 CO 4.705 4 CH 4 0.462 9 H 2 4.705 5 O 2 0.020 10 other 0.164

[0062] The primary ammonia removal synthesis gas is obtained by recycling the free ammo...

Embodiment 3

[0071] Example 3: Same as Example 2, using the above coke oven gas separation to obtain methane gas through Angle's ammoxidation synthesis reaction to obtain synthesis gas; reaction synthesis gas is obtained through joint removal of ammonia to obtain reaction synthesis gas containing no ammonia or trace amounts of ammonia ; The synthesis gas after ammonia removal is absorbed by deionized water to obtain hydrocyanic acid aqueous solution, and then refined to obtain high-purity liquid hydrocyanic acid, which is used for the synthesis of hydrocyanic acid derivatives; absorbing tail gas and sending tail gas to incineration Device incinerated. The quality that obtains high-purity liquid hydrocyanic acid is as follows:

[0072] Hydrocyanic acid (%) CO 3 2- (%) NH 3 + (%) other 99.78 - - water, trace impurities

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Abstract

The invention provides an environmental-protection cleaning technology for producing hydrocyanic acid derivatives by comprehensive utilization of coke oven gas. The environmental-protection cleaning technology is characterized in that 1, through the environmental-protection cleaning technology, coke oven gas is processed into relatively concentrated methane gas having relatively-low quality requirements by separation processes of pressure swing adsorption and the like, and the methane gas as a raw material is used for production of hydrocyanic acid derivatives; and 2, the environmental-protection cleaning technology concretely comprises the following steps that coke oven gas is separated by the separation processes of pressure swing adsorption and the like so that methane gas, hydrogen, carbon monoxide and tail gas are obtained; methane gas is synthesized into hydrocyanic acid mixed gas by ammonium oxidation or ammoniation dehydrogenation, and the hydrocyanic acid mixed gas reacts with a sodium hydroxide aqueous solution to produce sodium cyanide for synthesis of downstream hydrocyanic acid derivatives, or the hydrocyanic acid mixed gas and formaldehyde or other aldehydes are synthesized into hydroxyacetonitrile or other derivatives for synthesis of downstream hydrocyanic acid derivatives, or the hydrocyanic acid mixed gas is absorbed by water or other solvents and the solution is purified into high-purity hydrocyanic acid for synthesis of downstream hydrocyanic acid derivatives; hydrogen is used for synthesis of ammonia; and carbon monoxide and tail gas are used for synthesis of methanol and the synthesized methanol can be further oxidized into a formaldehyde product.

Description

technical field [0001] A method involving the production of hydrocyanic acid derivatives refers to an environmentally friendly and clean process method for the production of hydrocyanic acid derivatives through comprehensive utilization of coke oven gas, especially the use of coke oven gas to separate methane gas through pressure swing adsorption and other separation methods to produce hydrogen An environmentally friendly and clean process method for cyanic acid derivatives; fully considering the comprehensive utilization of resources such as hydrogen and carbon monoxide obtained from the separation of coke oven gas and the environmental protection of the production process of hydrocyanic acid derivatives, it is an environmentally friendly and clean production method for comprehensive utilization of resources . Background technique [0002] Coke oven gas is the gas produced in the coke production process. Its calorific value is about half that of natural gas, and its main co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C3/02C07C255/12C07C253/30
CPCC01B3/025C01B2203/068C01B2203/043C07C9/04C07C255/12C07C253/00C01C3/02C07C255/30C01C3/0229C07C255/16
Inventor 李宽义龙智曾雯娟白先丽李俊许晨
Owner 李宽义
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