Method for preparing high-purity sulfur from tail gas containing hydrogen sulfide

A hydrogen sulfide and tail gas technology, applied in the direction of sulfur preparation/purification, etc., can solve the problems of difficult control, low sulfur purity, narrow application range, etc., and achieve high purity, high application value, and high utilization rate.

Active Publication Date: 2021-06-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the Claus method is mainly used in the treatment technology with high concentration of hydrogen sulfide, which requires strict control of H in the process gas. 2 S and SO 2 The proportion of hydrogen sulfide gas needs to be treated, which makes it difficult to control the whole process, and a certain amount of organic sulfur compounds are generated during the reaction process, and the purity of sulfur is not high, so the application range is narrow

Method used

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  • Method for preparing high-purity sulfur from tail gas containing hydrogen sulfide
  • Method for preparing high-purity sulfur from tail gas containing hydrogen sulfide

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Experimental program
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Effect test

Embodiment 1

[0042] The method adopts sulfuric acid with a mass concentration of 75% as the absorption liquid to absorb hydrogen sulfide-containing tail gas, the hydrogen sulfide content is 5%, the molar ratio of sulfuric acid to hydrogen sulfide is 0.2:1, and the sulfuric acid enters the gas-liquid spray tower from the top and passes through the surface from the bottom. The tail gas of the aeration plate with a pore diameter of 15-20 μm is subjected to countercurrent contact, the reaction time is controlled for 30 minutes, and the reaction temperature is 80°C. The tail gas is subjected to three absorption reactions in series. The final sulfuric acid concentration of each stage of operation is 50%. Separate sulfur and dilute sulfuric acid.

[0043] The index of gained product is shown in table 1.

Embodiment 2

[0045] The method adopts sulfuric acid with a mass concentration of 85% as the absorption liquid to absorb hydrogen sulfide-containing tail gas, the hydrogen sulfide content is 30%, the molar ratio of sulfuric acid to hydrogen sulfide is 0.4:1, and the sulfuric acid enters the bubble tower from the top and passes through the surface pores from the bottom. The tail gas of the aeration plate with a diameter of 15-20 μm is contacted in countercurrent, the reaction time is controlled for 15 minutes, and the reaction temperature is 25°C. The tail gas is subjected to 3 absorption reactions in series. The sulfuric acid concentration at the end of each stage operation is 50%, and the liquid and solid are separated after the reaction Get sulfur and dilute sulfuric acid.

[0046] The index of gained product is shown in table 1.

Embodiment 3

[0048] The method adopts sulfuric acid with a mass concentration of 90% as the absorbing liquid to absorb hydrogen sulfide-containing tail gas, the hydrogen sulfide content is 1%, the molar ratio of sulfuric acid to hydrogen sulfide is 0.6:1, and the sulfuric acid enters the loop reactor from the top and passes through the surface pores from the bottom. The tail gas of the aeration plate with a diameter of 15-20 μm is contacted in countercurrent, the reaction time is controlled for 60 minutes, and the reaction temperature is 30 ° C. The tail gas is subjected to two absorption reactions in series. The final sulfuric acid concentration of each stage operation is 50%, and the liquid and solid are separated after the reaction Get sulfur and dilute sulfuric acid.

[0049] The index of gained product is shown in table 1.

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Abstract

The invention relates to a method for preparing high-purity sulfur from tail gas containing hydrogen sulfide. The method comprises the following step: carrying out contact reaction on the tail gas containing hydrogen sulfide and sulfuric acid through a contact device to obtain sulfur with the purity of more than or equal to 99.95%. The molar ratio of the sulfuric acid to the hydrogen sulfide is (0.1-1): 1; the concentration of the sulfuric acid is greater than or equal to 75%; and the high-purity superfine sulfur is obtained by controlling gas-liquid two-phase related parameters in the reaction process. The method is high in absorption reaction efficiency, mild in reaction process, free of secondary pollution and high in applicability. The purity of the sulfur product is greater than or equal to 99.5%, the particle size range is 10-30 [mu]m, and the sulfur product can be directly applied to industries such as medicine, agriculture and chemical engineering; and the treated absorption liquid can be directly sold or used as a by-product.

Description

technical field [0001] The invention relates to the technology of recovering high-purity ultra-fine sulfur from tail gas containing hydrogen sulfide, in particular to a method for preparing high-purity sulfur by using tail gas containing hydrogen sulfide. Background technique [0002] The generation of hydrogen sulfide waste gas comes from many industries, mainly including natural gas purification, petroleum refining, gas plants, sewage treatment plants and paper mills, etc., especially in some areas where industries are concentrated, a large amount of high-concentration hydrogen sulfide waste gas will be produced. Therefore, scientific and efficient treatment of hydrogen sulfide waste gas is required to avoid harm to human safety and the ecological environment. [0003] At present, the purification methods of hydrogen sulfide waste gas mainly include absorption method, adsorption method and oxidation method. Among them, the absorption method and the adsorption method both ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/05
CPCC01B17/05
Inventor 徐红彬张笛孙继远张红玲陈辉霞裴丽丽
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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