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Method for preparing hydrogen sulfide by using high-concentration sulfur dioxide and natural gas

A sulfur dioxide, high-concentration technology, applied in hydrogen sulfide, chemical instruments and methods, sulfur compounds, etc., can solve the problems of expensive carbon disulfide and poor economy, and achieve the effect of ensuring production safety, easy adjustment, and controllable scale of production equipment

Active Publication Date: 2019-10-22
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the need for additional investment in equipment such as hydrogen sulfide separation and purification, the initial investment is increased, and the application is generally farther than hydrogen sulfide, resulting in poor economic efficiency
[0005] The process of hydrolyzing carbon disulfide to produce hydrogen sulfide is simple to operate, but because carbon disulfide is expensive, its economy is poor, so it is only suitable for small and medium-scale applications

Method used

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  • Method for preparing hydrogen sulfide by using high-concentration sulfur dioxide and natural gas

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Experimental program
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Effect test

Embodiment 1

[0030] In this embodiment, a small-scale experimental system has been set up, which includes a simulated flue gas generation system, the simulated flue gas flow rate is 1L / min, and the steel cylinder provides high concentration SO 2 and CH 4 Gas, and use nitrogen as a carrier gas to provide different concentrations of water vapor to the secondary reactor. The flue gas passes through the primary reactor and the secondary reactor; both reactors are equipped with a temperature control system, which can regulate the temperature of the flue gas in the reaction device within the range of 100-1000°C. Using the above-mentioned small test platform for research, such as figure 1 shown.

[0031] (1) In the primary reactor with high concentration SO 2 Raw material (the volume concentration containing sulfur dioxide is 20%), natural gas is used as reducing agent (wherein CH 4 Concentration is 20%), through high-temperature catalytic reduction reaction, produces primary mixed gas; Descr...

Embodiment 2

[0036] A kind of method utilizing natural gas and sulfur to prepare hydrogen sulfide, this method comprises the following steps:

[0037] 1) The method is divided into two stages. In the first reactor, the high-concentration SO 2 As the raw material, natural gas is used as the reducing agent to generate carbon disulfide and hydrogen sulfide through high-temperature catalytic reduction reaction. The reduction reaction temperature is controlled at 500°C and the pressure is 0.1MPa. The catalytic reduction reaction of methane and sulfur dioxide occurs on the catalyst with a space velocity of 200h-1 . The catalyst uses titanium oxide as a carrier, CeO as an active component, wherein the mass of the active component is 20% of the carrier, and is prepared by a conventional catalyst preparation method in the field such as a roasting method.

[0038] 2) The first-stage mixed gas produced by the reaction of step (1) is hydrolyzed with water vapor in the second-stage reactor, so that the...

Embodiment 3

[0042] A kind of method utilizing natural gas and sulfur to prepare hydrogen sulfide, this method comprises the following steps:

[0043] 1) The method is divided into two stages. In the first reactor, the high-concentration SO 2 As the raw material, natural gas is used as the reducing agent to generate carbon disulfide and hydrogen sulfide through high-temperature catalytic reduction reaction. The reduction reaction temperature is controlled at 800°C and the pressure is 0.5MPa. The catalytic reduction reaction of methane and sulfur dioxide occurs on the catalyst with a space velocity of 2000h -1 . The catalyst is supported by zirconia, MoO 3 It is an active component, wherein the mass of the active component is 5% of the carrier, and it is prepared by a conventional catalyst preparation method in the field, such as an impregnation-calcination method.

[0044] 2) The first-stage mixed gas produced by the reaction of step (1) is hydrolyzed with water vapor in the second-stage...

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Abstract

The invention relates to a method for preparing hydrogen sulfide by using high-concentration sulfur dioxide and natural gas. The method comprises the following steps of: firstly, reacting an appropriate amount of methane with high-concentration sulfur dioxide at a proper temperature to produce carbon disulfide, hydrogen sulfide, carbon dioxide and water; allowing the produced products to enter a secondary reactor for catalytic hydrolysis of the carbon disulfide into hydrogen sulfide; and finally, subjecting residual carbon disulfide and water to cooling and separation to obtain high-concentration gas mixture of hydrogen sulfide and carbon dioxide, and introducing the obtained high-concentration hydrogen sulfide gas to a sewage acid treatment device. Compared with the prior art, the invention has the advantages that raw materials are economical and easily available, the problem of sulfur dioxide pollution is overcome, valuable sulfur resources are recovered, the requirements of sustainable development are met, the process requirements of sewage acid treatment in the smelting industry are met, etc.

Description

technical field [0001] The invention relates to the field of hydrogen sulfide preparation, in particular to a method for preparing hydrogen sulfide by utilizing high-concentration sulfur dioxide and natural gas. Background technique [0002] The heavy metals in the non-ferrous smelting industry mainly exist in the dirty acid wastewater after cooling and washing, and the treatment of the dirty acid wastewater is crucial to the treatment of heavy metal pollution in the non-ferrous smelting industry. Sulfurization method is a very effective method to remove heavy metals in polluted acid. Generally, hydrogen sulfide is directly introduced into the polluted acid containing heavy metals. However, the source and preservation of hydrogen sulfide restrict the application and promotion of this method. At present, the preparation methods of hydrogen sulfide can be divided into: sulfur hydrogenation method, sulfuration method, by-product recycling method and carbon disulfide hydrolysis...

Claims

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Application Information

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IPC IPC(8): C01B17/16C01B32/50
CPCC01B17/164C01B32/50
Inventor 晏乃强瞿赞冯圣君冯杰殷禄华孙小明
Owner SHANGHAI JIAO TONG UNIV
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