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Method of concentrating and recycling hydrogen sulfide in industrial acid gas by absorption of organic solvent

An organic solvent, hydrogen sulfide technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of less foam and low viscosity, and achieve the effect of less foam, low viscosity and good selectivity

Active Publication Date: 2019-07-26
KUNMING UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is dedicated to solving the problem of hydrogen sulfide purification and resource utilization, and proposes a method for absorbing and concentrating hydrogen sulfide in industrial acid gas with an organic solvent and utilizing resources. An organic solvent with less, good selectivity and easy regeneration is used to absorb and separate hydrogen sulfide gas in concentrated acid waste gas, and develop organic solvent absorption and concentrated hydrogen sulfide technology and resource utilization methods

Method used

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  • Method of concentrating and recycling hydrogen sulfide in industrial acid gas by absorption of organic solvent
  • Method of concentrating and recycling hydrogen sulfide in industrial acid gas by absorption of organic solvent
  • Method of concentrating and recycling hydrogen sulfide in industrial acid gas by absorption of organic solvent

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Effect test

Embodiment 1

[0028] Example 1, such as figure 1 As shown, the methods of absorbing and enriching hydrogen sulfide and resource utilization in industrial acid gas by the organic solvent are as follows:

[0029] Industrial acid gas containing hydrogen sulfide: hydrogen sulfide content 30.1% (v / v), carbon dioxide content 66.2% (v / v), other impurity components 3.7% (v / v), pressure 0.3MPa, gas temperature 38°C; Composition of primary organic solvent I: 35% (v / v) MDEA, 40% (v / v) of glycerol, 25% (v / v) of water; Composition of secondary organic solvent I: 60% (v / v) MDEA, Glycerol 20% (v / v), Water 20% (v / v).

[0030] The industrial acid gas containing hydrogen sulfide enters the primary absorption tower and contacts with the primary organic solvent I countercurrently, the liquid-gas ratio is L:m 3 15, the hydrogen sulfide and a small amount of carbon dioxide in the industrial acid gas containing hydrogen sulfide are absorbed, and the remaining components such as most of the carbon dioxide, a sma...

Embodiment 2

[0033] Embodiment 2: as figure 2 As shown, the methods of absorbing and enriching hydrogen sulfide and resource utilization in industrial acid gas by the organic solvent are as follows:

[0034] Industrial acid gas containing hydrogen sulfide: hydrogen sulfide content 24.6% (v / v), carbon dioxide content 67.4% (v / v), other impurity components 8% (v / v), pressure 0.35MPa, flue gas temperature 42 ℃ ;Organic solvent I composition: MEDA50% (v / v), glycerin 30% (v / v), water 20% (v / v); organic solvent II composition: MDEA90% (v / v), octanol 10 %(v / v).

[0035] The industrial acid gas containing hydrogen sulfide enters the primary absorption tower and contacts with the organic solvent I countercurrently, the liquid-gas ratio L:m 3 For 18, the hydrogen sulfide and a small amount of carbon dioxide in the industrial acid gas containing hydrogen sulfide are absorbed, and the remaining components such as most of the carbon dioxide, a small amount of hydrogen sulfide, nitrogen and other imp...

Embodiment 3

[0038] Embodiment 3: as image 3 As shown, the methods of absorbing and enriching hydrogen sulfide and resource utilization in industrial acid gas by the organic solvent are as follows:

[0039] Industrial acid gas containing hydrogen sulfide: hydrogen sulfide content 40.1% (v / v), carbon dioxide content 55% (v / v), other impurity components 4.9% (v / v), pressure 0.4MPa, gas temperature 35°C; Composition of primary organic solvent I: 30% (v / v) MDEA, 40% (v / v) ethanol, 30% (v / v) water; composition of secondary organic solvent I: 40% (v / v) MDEA, 20% ethanol % (v / v), water 40% (v / v); organic solvent II composition: MEDA70% (v / v), ethylene glycol 30% (v / v);

[0040] The industrial acid gas containing hydrogen sulfide enters the primary absorption tower and contacts with the primary organic solvent I countercurrently, the liquid-gas ratio is L:m 3 10, the hydrogen sulfide and a small amount of carbon dioxide in the industrial acid gas containing hydrogen sulfide are absorbed, and th...

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Abstract

The invention discloses a method of concentrating and recycling hydrogen sulfide in industrial acid gas by absorption of an organic solvent, and belongs to the field of air pollution control. The method is characterized in that an organic absorbing solvent is prepared by mixing alcohol amines, alcohols and / or water in a certain ratio, industrial waste gas with hydrogen sulfide gas is subjected toselective absorption before thermal desorption, hydrogen sulfide gas with a concentration of greater than 95% is acquired by concentrating, the high-concentration hydrogen sulfide gas is subjected toreaction with sodium hydroxide, ammonia water and other alkaline materials to prepare sodium sulfide, sodium hydrosulfide, ammonium sulfide solution and other products; the hydrogen sulfide gas can bedissolved stably in the organic solvent above, so that after the organic solvent absorbs the hydrogen sulfide gas, local storage and transportation can be performed directly; the high-concentration hydrogen sulfide gas is made by thermal desorption and is applied to the synthesis of chemical products and other uses; the desorbed organic solvent can be returned to the absorbing phase for cyclic use. The method herein is simple, low in cost, low in energy consumption, and free of wastewater or waste residue.

Description

technical field [0001] The invention discloses a method for organic solvent absorption and extraction of hydrogen sulfide in concentrated industrial acid gas and resource utilization, belonging to the field of air pollution control. Background technique [0002] Hydrogen sulfide is a highly irritating gas, highly toxic, and has a strong smell of rotten eggs. The presence of hydrogen sulfide in industrial acid gas will have adverse effects on subsequent treatment (such as causing equipment and pipeline corrosion, catalyst poisoning, and threatening personal safety, etc.), it is therefore necessary to control the sulfur content in process raw materials and products. Hydrogen sulfide gas is mainly produced in gas streams such as natural gas, synthetic gas, and gas refineries, especially the acid gas containing high concentrations of hydrogen sulfide and carbon dioxide produced by crude coal gas after methanol washing process. Before being further processed or discharged, it mus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/14B01D53/02
CPCB01D53/18B01D53/1468B01D53/1425B01D53/02B01D53/1475B01D2252/20478B01D2252/202B01D2252/2021B01D2252/2023B01D2253/102
Inventor 普煜王学谦王郎郎
Owner KUNMING UNIV OF SCI & TECH
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