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Process for treating a gas stream

A gas and in-gas technology, applied in separation methods, chemical instruments and methods, flow control, etc., can solve the problems of expensive and dangerous ammonia treatment, and achieve the effect of offsetting treatment costs and reducing costs

Inactive Publication Date: 2009-07-08
THIOSOLV
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  • Abstract
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Problems solved by technology

Ammonia Disposal Is Expensive and Dangerous

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  • Process for treating a gas stream
  • Process for treating a gas stream

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Embodiment Construction

[0011] The present invention provides a cost-effective process for the treatment of gases, such as hydrocarbon gases, containing hydrogen sulfide and carbon dioxide pollutants. A scrubbing solution comprising ammonium sulfate and ammonium bisulfite is used to react with hydrogen sulfide to form ammonium thiosulfate according to the following general reaction formula:

[0012] 6NH 3 +4SO 2 +2H 2 S+H 2 O→3(NH 4 ) 2 S 2 o 3

[0013] Ammonium thiosulfate is a readily marketable product and can be sold to reduce the cost of gas treatment. In addition, hydrogen sulfide is converted into harmless materials.

[0014] Advantageously, the carbon dioxide does not react with the ammonium sulfate and ammonium bisulfite in the wash liquor. Thus, in contrast to most physical and alkaline solvents, the scrubbing liquid selectively absorbs hydrogen sulfide and repels carbon dioxide within the gas.

[0015] Such as figure 1 Shown is a first embodiment of a process for removing sulfu...

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Abstract

The invention relates to a gas treating process of generating ammonium thiosulfate by contracting a gas (1) comprising hydrogen suilfide and carbon dioxide with a scrub solution (2) comprising ammonium sulfite and ammonium bisulfite in a first contact zone (3). The scrub solution can be formed in a second contact zone (6) by contacting ammonia (8) and hydrogen sulfide (7) with an aqueous solution. The oxidation potential of the first contact zone effluent liquid can be controlled by modulating the amount of sulfur dioxide supplied to the second contact zone. Alternatively, the sulfite concentration of the first contact zone can be measured by an infrared analyzer and can be modulated in response to the amount of sulfur dioxide supplied to the second contact zone. Additionally, the amount of ammonia supplied to the second contact zone can be modulated in response to the pH in the second contact zone.

Description

technical field [0001] The present invention relates to the removal of hydrogen sulfide from gases containing carbon dioxide by converting the hydrogen sulfide into ammonium thiosulfate. Background technique [0002] In gases and liquids in energy production and the chemical industry, hydrogen sulfide (H 2 S) and carbon dioxide (CO 2 ) usually coexist. These gases include hydrocarbon gases synthesized from coal, petroleum coke, residual oil, shale oil, tar sands, biomass and other carbonaceous materials. Hydrogen sulfide is toxic and is considered a pollutant that produces acid rain. Therefore, leakage of hydrogen sulfide into the atmosphere must be prevented. Common methods for the removal of hydrogen sulfide from liquids or gases include the use of physical solvents such as Selexol, basic solvents such as amine solutions or inorganic bases such as sodium hydroxide, and direct liquid oxidation techniques such as SulFerox and LoCat. Unfortunately carbon dioxide is also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/52B01D53/62G05D7/00G05D21/00
CPCY02C10/04Y02C10/06
Inventor 马克·C·安德森迈克尔·F·雷罗纳德·谢弗
Owner THIOSOLV
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