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Absorbing liquid for eliminating sulfide from gas mixture

A technology for gas mixtures and absorbing liquids, which is used in the preparation/purification of sulfur, chemical instruments and methods, separation methods, etc.

Inactive Publication Date: 2003-06-04
江苏蓝电环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] None of the above methods can remove organic sulfur and inorganic sulfur at the same time with amine solution, so it is necessary to add other desulfurization devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0016] Composition of absorption liquid: main absorbent hindered amine (I) 25%, MDEA (II) 15%, cosolvent (III) formyl morpholine, etc. 5%, catalyst (IV) monoethanolamine, etc. 3%, raw material gas composition: N 2 72.1%, CO 2 23.3%, H 2 S 3.6%, sulfide 538mg / m 3 . At 40°C monoethanolamine is absorbed under normal pressure, and the removal rate of sulfide is 76.8%. Implementation example three:

Embodiment 3

[0017] The composition of the absorption liquid: 15% of the main absorbent hindered amine (I), 40% of MDEA (II), 5% of the cosolvent (III) N-methylpyrrolidone, etc., 3% of the catalyst (IV) piperazine, etc., and the raw material gas is Semi-water gas (N 2 21.8%, CO 2 8.0%, CO 28.5%, H 2 40.0%, O 2 0.4%, CH 4 1.3%, COS 136mg / m 3 ), 0.5MPa absorption, tower top temperature 40°C, COS removal rate: 95.2%. Implementation example four:

Embodiment 4

[0018] The absorption liquid is: main absorbent hindered amine (I) 5%, MDEA (II) 15%, cosolvent (III) sulfolane 10%, catalyst (IV) diethanolamine, etc. 5%, raw material gas adopts shift gas (N 2 16.98%, CO 2 28.43%, CO 1.20%, H 2 52.38%, CH 4 1.01%), mixed with mercaptan 2132mg / m 3 , 0.5MPa absorption, tower top temperature 40°C, mercaptan removal rate: 71.2%.

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PUM

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Abstract

The present invention belongs to gas producing technology. The absorbing liquid for eliminating sulfide from gas mixture includes main absorbent comprising steric hindrance amine and N-methyl diethanolamine; cosolvent of one or several of sulfolane, N-methyl pyrrolidine, polyglycol dialkyl ether, morpholine and its derivative; catalyst of one or several of C2-C12 alkanolamine, piperazine and its derivative, quinoline, urea and metal phthalocyanine complex. Using the absorbing liquid can eliminate H2S, COS, mercaptan, thioether and other sulfide in less steps.

Description

technical field [0001] The invention belongs to the technical field of gas purification, in particular to removing H from gas mixtures 2 S, COS, mercaptan, sulfide and other sulfide absorption liquid. Background technique [0002] Process gas streams such as natural gas, refinery gas, and synthesis gas often contain H 2 S, COS, mercaptans, sulfides and other sulfides must be removed before further utilization. The alkanolamine method is the removal of H 2 The most commonly used method for acid gas impurities such as S. Such as; US4,551,158; US4,553,984; US4,537,753; CA1291321; CA1295810; DE1904428; However, the above methods cannot effectively remove organic sulfur. [0003] US3,716,620 proposes adding iodine in amine solution to remove H 2 S and thiols. [0004] US4,808,765 proposes to remove H in the feed gas with MDEA and diisopropanolamine (DIPA) mixed solution 2 S and COS. [0005] US5,589,149 proposes to use a mixed solution of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/48C01B17/04
Inventor 毛松柏朱道平肖红丁雅萍陆建刚叶宁黄晓燕
Owner 江苏蓝电环保股份有限公司
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