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Method for preparing sodium hydrosulfide

A technology of sodium hydrosulfide and calcium hydrosulfide, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of reducing the yield of caustic soda, affecting the use of users, blocking equipment and pipelines, etc.

Inactive Publication Date: 2009-01-07
褚亚华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The production of sodium hydrosulfide by the caustic soda method requires no carbon dioxide in the raw material gas. If the raw material gas contains carbon dioxide, sodium carbonate will be generated during the production process: NaOH+CO 2 →Na 2 CO 3 +H 2 O, the generation of sodium carbonate not only reduces the yield of caustic soda, but also affects the quality of sodium hydrosulfide and the use of users. If the carbon dioxide content is greater than 10%, it will also block equipment and pipelines during production, so that production cannot be carried out normally.

Method used

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  • Method for preparing sodium hydrosulfide

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Embodiment approach 1

[0019] The present invention prepares the method for sodium hydrosulfide, its specific production process:

[0020] In the milk of lime with a concentration of about 12%, the hydrogen sulfide H 2 S and carbon dioxide CO 2 The mixed gas, in which the hydrogen sulfide content is more than 10%, the carbon dioxide content is not more than 90%, the temperature is controlled at 50-80°C, the pressure is -0.05--0.01Mpa, the reaction is terminated when CaS≤0.5%, and the sediment CaCO is separated 3 Obtain calcium hydrosulfide solution;

[0021] In a caustic soda solution with a concentration greater than 30%, pass it under stirring containing hydrogen sulfide H 2 S and carbon dioxide CO 2 The mixed gas, in which the content of hydrogen sulfide is more than 10%, the content of carbon dioxide is not more than 90%, the temperature is controlled at 50~80℃, the pressure is -0.05~-0.01Mpa, in Na 2 When S≤0.5%, the reaction is finished to obtain a sodium bisulfide solution containing carb...

Embodiment approach 2

[0023] When the customer does not require calcium ions in the product, the method for preparing sodium hydrosulfide in the present invention, its specific production process:

[0024] Mix lime milk with a concentration of about 12% into a caustic soda solution with a concentration greater than 30%, and pass it in with hydrogen sulfide H 2 S and carbon dioxide CO 2 The mixed gas, in which the content of hydrogen sulfide is more than 10%, the content of carbon dioxide is not more than 90%, the temperature is controlled at 50~80℃, the pressure is -0.05~-0.01Mpa, in Na 2 When S≤0.5%, the reaction ends and the sediment CaCO is separated 3 A sodium hydrosulfide product containing calcium ions is obtained.

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Abstract

The invention discloses a method for preparing sodium hydrosulfide. The production process is as follows: introducing a mixed gas containing sulfureted hydrogen H2S with the content larger than 10 percent and carbon dioxide CO2 with the content not larger than 90 percent into lime cream of about 12 percent of concentration, under the condition of a certain temperature and pressure and under agitation; stopping reaction when CaS is less than or equal to 0.5 percent; separating sediments out to obtain a sulfur calcium hydroxide solution; introducing a mixed gas of sulfureted hydrogen and carbon dioxide into a caustic soda solution with concentration larger than 30 percent under the condition of a certain temperature and pressure and under agitation; stopping reaction when Na2S is less than or equal to 0.5 percent to obtain a sodium hydrosulfide solution containing carbonate ions; and adding slightly not enough sodium hydrosulfide solution under agitation according to the amount of the carbonate ions in the sodium hydrosulfide solution, and separating sediments out to obtain sodium hydrosulfide with low carbonate ions.

Description

technical field [0001] The invention relates to a preparation method of sodium hydrosulfide, in particular to a method for preparing sodium hydrosulfide by using mixed gas of hydrogen sulfide and carbon dioxide and sodium hydroxide as raw materials. Background technique [0002] The preparation method of sodium hydrosulfide is caustic soda absorption method at present, and it requires raw material gas to be relatively pure hydrogen sulfide gas, mainly is to utilize the tail gas of producing barium chloride or barium nitrate and sodium hydroxide solution to react to prepare sodium hydrosulfide. The production of sodium hydrosulfide by the caustic soda method requires no carbon dioxide in the raw material gas. If the raw material gas contains carbon dioxide, sodium carbonate will be generated during the production process: NaOH+CO 2 →Na 2 CO 3 +H 2 O, the generation of sodium carbonate not only reduces the yield of caustic soda, but also affects the quality of sodium hydros...

Claims

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Application Information

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IPC IPC(8): C01B17/32
Inventor 褚亚华程健李新志
Owner 褚亚华
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