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Method for removing hydrogen sulfide and carbonyl sulfide in gas

A technology for removing gas and hydrogen sulfide, applied in chemical instruments and methods, separation methods, and separation of dispersed particles, etc., can solve problems such as pipelines, equipment corrosion, catalyst poisoning, environmental problems, etc., achieve high removal efficiency and improve efficiency , the effect of large operating flexibility

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As we all know, industrial raw material gas containing hydrogen sulfide will cause corrosion of pipelines and equipment, catalyst poisoning, and affect product quality; exhaust gas emissions containing hydrogen sulfide and mercaptans will cause serious environmental problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: remove hydrogen sulfide and carbonyl sulfide in the gas with the said complexed iron solution containing heterocyclic amine of the present invention, gas enters in the absorption tower from bottom to top, and desulfurization liquid passes through distributor, and from top to bottom and The sulfur-containing gas is contacted in countercurrent, and the desulfurized gas is analyzed by a measuring instrument for the content of hydrogen sulfide and carbonyl sulfide in the gas, and the solution that has absorbed the sulfide enters the oxidation regeneration tower, and the sulfur is recovered through oxidation regeneration. The test gas is natural gas with a certain amount of hydrogen sulfide and carbonyl sulfide added.

[0017] (2) Test conditions

[0018] The concentration of hydrogen sulfide prepared by natural gas is 10.2 g / ·Nm 3 , carbonyl sulfide 205m g / ·Nm 3 , the test gas.

[0019] Test gas flow rate: 1 Nm 3 / Hour

[0020] Gas pressure: 1Mpa

[0...

Embodiment 2

[0028] Embodiment 2: test method is the same as embodiment 1

[0029] (2) Test conditions

[0030] Use natural gas to prepare hydrogen sulfide with a concentration of 10.7 g / ·Nm 3 , carbonyl sulfide 255m g / ·Nm 3 , the test gas.

[0031] Test gas flow rate: 1 Nm 3 / Hour

[0032] Gas pressure: 1Mpa

[0033] Liquid flow: 22 liters / hour

[0034] Absorption and regeneration temperature: ~40 o C

[0035] 1.2-Dimethylimidazole content: 5g / l

[0036] 1.4-diazobicyclooctane content 5g / l

[0037] Iron concentration of complex iron solution 2.8 g / L

[0038] Solution pH 8.5

[0039] (3) Desulfurization effect

[0040] Under the above test conditions, the average content of hydrogen sulfide in the purified gas during the absorption process of continuous ventilation for 72 hours is 4mg· / Nm 3 , carbonyl sulfide 36m g / ·Nm 3 .

Embodiment 3

[0041] Embodiment 3: test method is the same as embodiment 1

[0042] (2) Test conditions

[0043] The concentration of hydrogen sulfide prepared by natural gas is 12.8 g / ·Nm 3 , carbonyl sulfide 675m g / ·Nm 3 , ethanethiol 465m g / ·Nm 3 the test gas.

[0044] Test gas flow rate: 1 Nm 3 / Hour

[0045] Gas pressure: 1Mpa

[0046] Liquid flow: 22 liters / hour

[0047] Absorption and regeneration temperature: ~40 o C

[0048] 1.4-Dimethylpiperazine content: 5g / l

[0049] 1.2-Dimethylimidazole content: 10g / l

[0050] Iron concentration of complex iron solution 2.8 g / L

[0051] Solution pH 8.5

[0052] (3) Desulfurization effect

[0053] Under the above test conditions, the average content of hydrogen sulfide in the purified gas during the absorption process of continuous ventilation for 72 hours is 7mg· / Nm 3 , carbonyl sulfide 134m g / ·Nm 3 .

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PUM

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Abstract

The invention belongs to the technical field of gas purification, and discloses a method for treating a gas containing hydrogen sulfide and carbonyl sulfide. The method is characterized by adopting an improved chelated iron absorbing solution, and comprises the following steps: transforming carbonyl sulfide into hydrogen sulfide under a catalysis function of heterocyclic amine, and transforming hydrogen sulfide in the gas into sulfhydryl ions by using the chelated iron absorbing solution in an absorbing process; and regenerating a pregnant solution absorbing hydrogen sulfide by virtue of air oxidization to transform the sulfhydryl ions into elemental sulfur which is harmless to an environment, wherein the heterocyclic amine is one or a mixture of more of 1,4-diazabicyclooctane, 1,2-dimethylimidazole, 1,4-dimethylpiperazine and triethylene tetramine. By adopting the chelated iron absorbing solution containing the heterocyclic amine, the efficiency of removing carbonyl sulfide is improved, the carbonyl sulfide removing rate is greater than 80 percent, and the hydrogen sulfide removing efficiency is greater than 99.9 percent.

Description

technical field [0001] The invention belongs to the technical field of gas purification, and relates to a method for removing hydrogen sulfide and carbonyl sulfide from gas. Specifically, the invention is a redox desulfurization method by adding heterocyclic amines. Background technique [0002] As we all know, industrial feed gas containing hydrogen sulfide will cause corrosion of pipelines and equipment, catalyst poisoning, and affect product quality; exhaust gas emissions containing hydrogen sulfide and mercaptans will cause serious environmental problems. [0003] The methods for removing hydrogen sulfide mainly include: (1) dry desulfurization, such as iron oxide method, zinc oxide method and activated carbon method. (2) Alcohol amine method. (3) Wet oxidation methods, such as ADA method, tannin extract method, MSQ method, PDS method and complex iron method, etc. (4) Physical solvent methods such as low-temperature methanol method, NHD method, etc. [0004] The metho...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/52B01D53/48
Inventor 杨建平
Owner CHINA PETROLEUM & CHEM CORP
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