Hydrogen sulfide and carbonyl sulfide resource recycling method based on molten salt

A technology of hydrogen sulfide and carbonyl sulfide, applied in chemical instruments and methods, magnesium/calcium/strontium/barium sulfide/polysulfide, separation methods, etc., can solve the problem of not considering the stability of molten salt, unrecoverable sulfur, etc. problems, to achieve the effect of ensuring long-term stable operation, realizing resource recycling, and ensuring utilization efficiency

Inactive Publication Date: 2017-11-07
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not consider the stability of the molten salt after the polluting gas is absorbed into the molten salt system, and the sulfur cannot be recovered.

Method used

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  • Hydrogen sulfide and carbonyl sulfide resource recycling method based on molten salt
  • Hydrogen sulfide and carbonyl sulfide resource recycling method based on molten salt
  • Hydrogen sulfide and carbonyl sulfide resource recycling method based on molten salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of functional molten salt: mix lithium carbonate, sodium carbonate, and potassium carbonate according to the mass ratio of 32.1:33.4:34.5, weigh 50 g of the mixed carbonate, add 5 g of calcium carbonate to the mixed carbonate, and perform mechanical grinding for 1 hours, followed by heating and melting to form a liquid functional molten salt;

[0028] (2) Hydrogen sulfide adsorption and enrichment: heat the functional molten salt to 500°C, add 2% carbon powder to the molten salt, and then pass hydrogen sulfide with a concentration of 800ppm into the molten salt, and the adsorption reaction is maintained for 10 hours. The concentration of hydrogen sulfide in the exhaust gas is figure 1 As shown, it can be seen that the removal rate of molten salt to hydrogen sulfide reaches 100%;

[0029] (3) Sulfide recovery: suspend the introduction of gas containing hydrogen sulfide, add 3g of calcium carbonate to the molten salt system after the reaction, stir for ha...

Embodiment 2

[0033] (1) Preparation of functional molten salt: mix lithium carbonate, sodium carbonate, and potassium carbonate according to the mass ratio of 32.1:33.4:34.5, weigh 50g of the carbonate mixture, add 12.5g of barium carbonate to the mixed carbonate, and perform mechanical grinding 1 hour, followed by heating and melting to form a liquid functional molten salt;

[0034] (2) Adsorption and enrichment of hydrogen sulfide and carbonyl sulfide: heat the functional molten salt to 750°C, add 5% carbon powder to the molten salt, then pass hydrogen sulfide with a concentration of 800ppm and carbonyl sulfide with a concentration of 400ppm into the molten salt, The adsorption reaction was maintained for 10 hours, and the concentration of hydrogen sulfide and carbonyl sulfide in the tail gas was detected as figure 2 As shown, it can be seen that the removal rate of molten salt to hydrogen sulfide and carbonyl sulfide reaches 100%;

[0035] (3) Sulfide recovery: suspend the introductio...

Embodiment 3

[0039] (1) Preparation of functional molten salt: mix lithium chloride, sodium chloride, and potassium chloride according to the mass ratio of 32.8:33.8:33.4, weigh 50 g of the mixed chloride salt, add 10 g of barium chloride to the mixed chloride salt, and Perform mechanical grinding for 1 hour, then heat and melt to form liquid functional molten salt;

[0040] (2) Carbonyl sulfide adsorption and enrichment: heat the functional molten salt to 600°C, add 3% carbon powder to the molten salt, then pass carbonyl sulfide with a concentration of 800ppm into the molten salt, and maintain the adsorption reaction for 10 hours. The concentration of carbonyl sulfide in the exhaust gas is as image 3 As shown, it can be seen that the removal rate of molten salt to carbonyl sulfide reaches 100%;

[0041] (3) Sulfide recovery: suspend the introduction of gas containing carbonyl sulfide, add 3g of barium chloride to the molten salt system after the reaction, stir for half an hour and then ...

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Abstract

The invention discloses a hydrogen sulfide and carbonyl sulfide resource recycling method based on a molten salt. The method includes the following steps of (1) functional molten salt preparation, wherein a calcium salt or a barium salt is added into an alkali metal mixing molten salt system, then grinding and homogenizing are conducted, and the mixture is heated to melt to form the liquid functional molten salt; (2) hydrogen sulfide and carbonyl sulfide adsorption and enrichment, wherein the functional molten salt is heated to 450-750 DEG C, then carbon powder is added into the molten salt, and then gas with hydrogen sulfide and carbonyl sulfide is introduced into the molten salt to make the hydrogen sulfide, the carbonyl sulfide and the molten salt be in complete contact reaction; (3) sulfide recycling, wherein introduction of the gas with the hydrogen sulfide and the carbonyl sulfide is paused, the reacted molten salt system is supplemented with the calcium salt or the barium salt and stirred for mixing, then sulfide generated by reaction still stands for precipitation, and finally the sulfide is exported from the molten salt system at a high temperature for recycling. According to the method, the functional molten salt is used, instant purification of the gas with the hydrogen sulfide and the carbonyl sulfide at a medium-high temperature is promoted, long-term stable operation of the molten salt system is guaranteed, and resource recycling of sulfur is achieved.

Description

technical field [0001] The invention belongs to the technical field of clean and efficient utilization of energy, and specifically relates to a method for purifying polluting gases; more specifically, it relates to a method for recovering hydrogen sulfide and carboxyl sulfur based on molten salt resource recovery. Background technique [0002] The pyrolysis / gasification process of coal, waste rubber, organic sludge, etc. will cause the release of polluting gases such as hydrogen sulfide and carbonyl sulfide. They not only corrode production equipment, threaten safe production, increase equipment investment costs, and even worse Yes, they are discharged into the atmosphere, which will cause serious harm to the human body and the environment. [0003] The commonly used sulfur removal methods are divided into wet desulfurization process and dry desulfurization process. The wet desulfurization process is to use the sulfur-containing gas to contact the absorption liquid to absor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/52B01D53/48C01B17/42
CPCB01D53/485B01D53/52B01D53/78B01D2251/404B01D2251/60B01D2251/606B01D2257/308B01D2258/02C01B17/42
Inventor 胡红云申俊豪姚洪谢康许勉刘欢杨宇涵
Owner HUAZHONG UNIV OF SCI & TECH
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