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Method for preparing sodium carbonate from hydrogen sulfide acid gas

A technology of hydrogen sulfide and sodium carbonate, applied in the directions of hydrogen sulfide, chemical instruments and methods, separation methods, etc., can solve the problems of inability to separate hydrogen sulfide and carbon dioxide clearly

Inactive Publication Date: 2014-04-02
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

It can be seen that the alcohol amine method is a traditional decarbonization and desulfurization technology. For sour gas occasions where hydrogen sulfide and carbon dioxide exist at the same time, the MDEA solution cannot clearly separate hydrogen sulfide and carbon dioxide.

Method used

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  • Method for preparing sodium carbonate from hydrogen sulfide acid gas

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Embodiment Construction

[0032] The specific operation of the method of the present invention see figure 1 As shown, the non-decarbonated gas A is sprayed and inhaled by the decarburized circulating lye L in the tubular mixing reactor 2, and mixed with the lye to react to absorb carbon dioxide and part of hydrogen sulfide in the acid gas. The lye after reacting and absorbing the acid gas enters the decarburization reaction tank 1 and stays for a sufficient time. The bicarbonate ions in the lye react with sodium bisulfide, and the sulfide ions are replaced from the sodium hydrosulfide salt molecules, and the sulfide Hydrogen produces displacement, and some hydrogen sulfide molecules leave the alkali solution and return to acid gas B after decarburization. The main component of the decarburization circulating lye is sodium bicarbonate. The pH value or free alkali concentration of the circulating lye is determined according to the amount of carbon dioxide in the acid gas. Part of the decarburized rich l...

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Abstract

The invention discloses a method for preparing sodium carbonate from hydrogen sulfide acid gas and belongs to the technical field of decarbonization. The method comprises the following steps: carrying out a mixed reaction on a buffer solution containing sodium hydroxide and sodium bicarbonate and non-decarburized hydrogen sulfide acid gas for absorbing carbon dioxide and partial hydrogen sulfide of the acid gas, thus obtaining a decarburized pregnant solution containing sodium bicarbonate and sodium bisulfide; and heating the decarburized pregnant solution to ensure that the sodium bisulfide in the decarburized pregnant solution is subjected to a hydrolysis reaction and is converted into sodium hydroxide, and reacting the sodium hydroxide generated in the hydrolysis reaction with free alkali and sodium bicarbonate in the decarburized pregnant solution to obtain sodium carbonate, wherein sodium carbonate is finally generated to be fixed from the carbon dioxide in the acid gas, and the hydrogen sulfide generated by the hydrolysis reaction is finally absorbed back to the acid gas. According to the method, the carbon dioxide can be effectively removed from the acid gas and is converted into the useful product sodium carbonate, and the decarburization rate is 60-90 percent.

Description

Technical field: [0001] The invention belongs to the technical field of decarburization, and in particular relates to a method for preparing sodium carbonate by utilizing hydrogen sulfide acid gas. The method uses "buffer solution decarburization" to remove carbon dioxide from acid gas and make it into sodium carbonate. Background technique: [0002] In coal chemical industry, petrochemical industry, natural gas chemical industry, chemical fertilizer industry and other chemical industries, gas purification and separation are important technologies in various chemical processes, among which gas decarbonization technology is widely used in chemical fertilizer industry, flue gas separation, synthesis gas purification and other processes . However, gas decarbonization technology and desulfurization technology at home and abroad are related, that is to say, gas has decarbonization function while desulfurization. According to the technical category, it can be divided into dry de...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/62C01D7/07C01B17/16
CPCY02C10/04Y02C20/40Y02P20/151
Inventor 崔平曲克林张超群刘祥
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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