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High-efficient desulfurizing agent for removing hydrogen sulfide and organic mercaptan from mixed gas

A technology of mixed gas and organic mercaptans, which is applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problems of large solvent usage, small acid gas load, and large energy consumption for solvent regeneration to achieve good degassing Elimination effect, low regeneration energy consumption, and small usage

Inactive Publication Date: 2010-09-29
四川省精细化工研究设计院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Both of the above solvents use chemical solvents to remove H 2 S and organic thiols have higher efficiencies, but the above two solvents have higher efficiency for H 2 The removal rate of S and organic mercaptans cannot achieve high removal efficiency at the same time. The acid gas load of the above two solvents is small, the amount of solvent used in the gas purification process is large, and the energy consumption of solvent regeneration is large; especially with energy shortage The aggravation and the continuous improvement of environmental protection requirements, for the treatment of high H 2 S. Organic mercaptan gas, these conventional desulfurizers can no longer meet the requirements

Method used

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  • High-efficient desulfurizing agent for removing hydrogen sulfide and organic mercaptan from mixed gas
  • High-efficient desulfurizing agent for removing hydrogen sulfide and organic mercaptan from mixed gas

Examples

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Embodiment 1

[0029] Example 1, the new high-efficiency composite desulfurizer of the present invention is composed of the following raw materials by weight percentage: 75% of N-methyldiethanolamine, 9.99% of tert-butylaminoethoxyethanol, 5% of sulfolane, and 10% of N-hydroxyethylpiperidine %, defoamer 0.01%, the desulfurizer with the above specific gravity is prepared into a 45% solution with water; the gas composition for raw material is: 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 22.1%, mercaptan 101PPm, mercaptan removal rate 74.4%, the acid gas load of solvent 0.65mol (H 2 S+CO 2 ) / mol amine.

Embodiment 2

[0030] Example 2, the new high-efficiency composite desulfurizer of the present invention is composed of the following raw materials by weight percentage: 70% of N-methyldiethanolamine, 9.98% of tert-butylaminoethoxyethanol, 10% of sulfolane, and 10% of N-hydroxyethylpiperidine %, defoamer 0.02%, the desulfurizer with the above specific gravity is prepared into a 45% solution with water; the composition of the raw material gas is: low-carbon hydrocarbon 90.1%, H 2 S4.4%, CO 2 5.45%, the gas purification of methyl mercaptan 256PPm, ethanethiol 182PPm, isopropyl mercaptan 47PPm, H in the purified gas 2 S is 9PPm, CO 2 2.2%, mercaptan 96PPm, mercaptan removal rate 80.2%, the acid gas load of solvent 0.68mol (H 2 S+CO 2 ) / mol amine.

Embodiment 3

[0031] Example 3, the new high-efficiency composite desulfurizer of the present invention is composed of the following raw materials by weight percentage: 60% of N-methyldiethanolamine, 19.99% of tert-butylaminoethoxyethanol, 5% of sulfolane, and 15% of N-hydroxyethylpiperidine %, defoamer 0.01%, the desulfurizer with the above specific gravity is prepared into a 45% solution with water; the gas composition for raw material is: 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 0.65mol (H 2 S+CO 2 ) / mol amine.

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Abstract

The invention discloses a high-efficient desulfurizing agent for removing hydrogen sulfide and organic mercaptan from mixed gas, which comprises serotonin, wherein the serotonin consists of N-methyl diethanolamine and ethoxy ethanol tert-butylamine, and also comprises sulfolane and N-Hydroxyethyl piperidine. The weight ratio of the serotonin in the desulfurizing agent is 70 to 85 percent; the weight ratio of the sulfolane in the desulfurizing agent is 5 to 10 percent; and the weight ratio of the N-Hydroxyethyl piperidine in the desulfurizing agent is 10 to 20 percent. By mixing physical and chemical solvent and abstracting the advantages of the physical and chemical solvent, so on the premise that the removal effect of H2S is ensured, the organic sulfur can be removed high efficiently; and the desulfurizing agent has large acid gas load, strengthens the reaction speed between the H2S and MDEA and TBEE, so the consumption of the desulfurizing agent is small during the gas purification process, and the regeneration energy consumption of the solvent is low.

Description

technical field [0001] The invention relates to a desulfurizer for removing hydrogen sulfide and organic mercaptan from mixed gas, and belongs to the technical field of separating acid gas from mixed gas. Background technique [0002] 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, while natural gas, synthetic gas, petroleum refinery gas, etc. must be purified before further processing and utilization to meet subsequent utilization requirements. At present, there are two types of solvents commonly used for gas desulfurization and decarburization. [0003] 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 dimethyl ether, and propylene carbonate. [0004] The second category is chemical solvents, whi...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/52B01D53/72
Inventor 江宁诸新宇李世荣严孝东李波
Owner 四川省精细化工研究设计院
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