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High-efficiency composite desulphurization solvent and system and method for removing acidic gas and organic sulfur

A technology for acid gas and organic sulfur, which is used in the field of removing hydrogen sulfide, organic mercaptan remover, and carbon dioxide. Effect

Inactive Publication Date: 2015-12-09
CHINA GASOLINEEUM ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The solvents mentioned above are useful for the removal of H 2 S and CO 2 It has higher efficiency, but it is in acid gas load, regeneration energy consumption, and H 2 There is still room for improvement in the selective absorption of S and the removal rate of organic sulfur, especially with the aggravation of energy shortage and the continuous improvement of environmental protection requirements, for the treatment of high H content 2 S, CO 2 , organic sulfur gas, these conventional desulfurization solvents can no longer meet the requirements

Method used

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  • High-efficiency composite desulphurization solvent and system and method for removing acidic gas and organic sulfur

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Effect test

Embodiment 1

[0036] Embodiment 1. The new high-efficiency composite desulfurization solvent of the present invention is composed of the following raw materials according to mass percentage: 50% of N-methyldiethanolamine, 22.39% of N-methyl-benzylethanolamine, 3-aza-2,2-dimethyl Hexylene glycol 10%, sulfolane 10%, N-hydroxyethylmorpholine 6%, defoamer 0.01%, benzylamine antioxidant 0.6%, heterocyclic amine preservative 1%, this composite desulfurization solvent is formulated with water 45% solution, used for feed gas composition: low carbon hydrocarbon 89.5%, H 2 S4.2%, CO 2 6.26%, the gas purification of methyl mercaptan 216PPm, ethanethiol 142PPm, and isopropyl mercaptan 37PPm, the H in the purified gas 2 S is 10PPm, CO 2 2.2%, mercaptan 103PPm, mercaptan removal rate 74%, the acid gas load of solvent 0.66mol (H 2 S+CO 2 ) / mol amine.

Embodiment 2

[0037] Example 2, the new high-efficiency composite desulfurization solvent of the present invention is composed of the following raw materials according to mass percentage: 45% of N-methyldiethanolamine, 22% of N-methyl-benzylethanolamine, 3-aza-2,2-dimethyl Hexylene glycol 10.39%, sulfolane 15%, N-hydroxyethylmorpholine 6%, defoamer 0.01%, benzylamine antioxidant 0.5%, heterocyclic amine preservative 1.1%, this composite desulfurization solvent is formulated with water 45% solution, used for raw material gas composition: 90.1% of low carbon hydrocarbons, H 2 S4.4%, CO 2 5.45%, the gas purification of methyl mercaptan 256PPm, ethanethiol 180PPm, and isopropyl mercaptan 49PPm, the H in the purified gas 2 S is 9PPm, CO 2 2.2%, mercaptan 98PPm, mercaptan removal rate 79.8%, the acid gas load of solvent 0.68mol (H 2 S+CO 2 ) / mol amine.

Embodiment 3

[0038] Example 3, the new high-efficiency composite desulfurization solvent of the present invention is composed of the following raw materials according to mass percentage: 43% of N-methyldiethanolamine, 15% of N-methyl-benzylethanolamine, 3-aza-2,2-dimethyl Hexylene glycol 10.39%, sulfolane 20%, N-hydroxyethylmorpholine 10%, defoamer 0.01%, benzylamine antioxidant 0.5%, heterocyclic amine preservative 1.1%, this composite desulfurization solvent is formulated with water 45% solution, used for feed gas composition: low carbon hydrocarbon 89.5%, H 2 S4.2%, CO 2 6.26%, the gas purification of 256PPm of methyl mercaptan, 182PPm of ethanethiol, and 47PPm of isopropyl mercaptan, the H in the purified gas 2 S is 10PPm, CO 2 2.4%, mercaptan 84PPm, mercaptan removal rate 82.6%, the acid gas load of solvent 0.68mol (H 2 S+CO 2 ) / mol amine.

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Abstract

The invention discloses a high-efficiency composite desulphurization solvent and a system and method for removing acidic gas and organic sulfur. The high-efficiency composite desulphurization solvent comprises, by mass, 70-85% of compound amine, 10-20% of a desulfurization enhancer, 10-30% of a physical solvent, 0.01-0.1% of an antifoaming agent, 0.5-2% of a benzylamine anti-oxidant and 0.5-2% of a heterocyclic amine antiseptic. The high-efficiency composite desulphurization solvent has the advantages of large acidic gas load, low sulfur content of purified gas, stable solvent performances and no corrosion on equipment, and can remove most of H2S and a large part of organic mercaptan from mixed gas. The high-efficiency composite desulphurization solvent and the system and method can greatly reduce a gas purification cost and reduce total sulfur content of the purified gas. The high-efficiency composite desulphurization solvent and the system and method can be used for removing H2S, CO2 and organic mercaptan in natural gas, petroleum refinery gas and synthetic gas.

Description

technical field [0001] The invention belongs to the technical field of separating acid gas from mixed gas, in particular to removing hydrogen sulfide (H 2 S), carbon dioxide (CO 2 ), organic mercaptan removal agent, system and method. Background technique [0002] Mixed gases mainly include natural gas, petroleum refinery gas, synthesis gas, liquefied petroleum gas, etc. [0003] Natural gas, synthetic gas, petroleum refinery gas and other industrial gases usually contain hydrogen sulfide (H 2 S), carbon dioxide (CO 2 ), mercaptans and other harmful substances must be purified before further processing and utilization to meet the requirements of subsequent utilization. At present, there are two types of solvents commonly used for gas desulfurization and decarburization. [0004] The first category is physical solvents, which are achieved by dissolving acidic gases in solvents. Typical physical solvents include sulfolane, N-methylpyrrolidone (NMP), polyethylene glycol di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/52B01D53/48B01D53/62B01D53/96
CPCY02A50/20Y02C20/40
Inventor 王远江李海荣梁宇成张津李波江宁韩敏张艺曹文浩刘家洪陈运强程林陈彰兵卢任务肖春雨郭庆生陈建良李超群陈娟
Owner CHINA GASOLINEEUM ENG
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