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A method for removing acid gas by biological method

A technology of acid gas and biological method, which is applied in the field of acid gas purification, can solve problems such as pollution, low desulfurization efficiency, and poor stability of desulfurization efficiency, and achieve the goals of avoiding blockage, low investment cost, good fluidization state and oxygen mass transfer rate Effect

Active Publication Date: 2019-06-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of low desulfurization efficiency, high cost, poor stability of desulfurization efficiency and high energy consumption in the prior art, the purpose of the present invention is to provide a biological method for acid gas removal and deodorization, which can not only remove In addition to carbon dioxide and hydrogen sulfide, organic sulfur such as carbonyl sulfide, carbon disulfide, and mercaptan can also be removed. The carbon dioxide absorbed by the lye can be used as a carbon source necessary for microbial growth and play a role in "carbon fixation". During the reaction process of hydrogen sulfide, it can Stable generation of elemental sulfur, the absorption liquid can be regenerated and reused, and the device can run continuously
Through high-efficiency bioreactor, bio-trickling filter tower and integrated automatic control device to achieve the purpose of carbon dioxide fixation, elemental sulfur recovery, absorption liquid recycling and organic sulfur removal, so as to effectively solve the problem of acid gas, especially organic sulfur pollution, and Ultimately achieve the unity of environmental benefits and economic benefits

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0039] Example 1: Immobilization process of Thiobacillus alkalophilus

[0040] Take Na 2 S 2 o 3 8 g / L, KNO 3 5 g / L, NaHCO 3 2g / L, KH 2 PO 4 Cultivate 0.1g / L medium at 30ºC for 2 days, and at the same time moderately aerate every 4 hours to expand the cultivation of the basophilic thiobacillus group, and then put 0.5% biological ceramsite as the carrier to make the basophilic thiobacillus group attached and fixed The above-mentioned culture was continued for 5-8 days, so that a large number of alkalophilic thiobacilli were attached to the carrier, and the attached biomass was weighed to be 1.536 mg / g, and the immobilization process was completed.

Embodiment 2

[0041] Embodiment 2: Biotrickling filter tower hanging membrane process

[0042] Combine the organothiolphilus solution with K 2 HPO 4 5 g / L, NaH 2 PO 4 2g / L, MgCl 2 0.2 g / L, NH 4 The culture solution of Cl 2 g / L and glycerol 2 g / L was inoculated at 1:20, with 0.5 mmol / L mercaptan as the sulfur source, and the nutrient solution containing organothiolophilic bacteria was sprayed onto the filler from top to bottom, Organosulfophilic bacteria are fixed on the filler, and the film-forming efficiency is accelerated through the synchronous domestication of the dominant bacteria on a regular basis, and gradually grow and fix to form a stable, uniform and dense biofilm, completing the biological film-forming process of the bio-trickling filter tower.

Embodiment 3

[0043] Example 3 Acid gas removal process

[0044] The exhaust gas to be treated is the stripping exhaust gas of sulfur-containing wastewater in the petrochemical industry, and its main composition is: 20% CO 2 , 4%H 2 S, COS / CH 3 CH / CS 2 2000 ppmv, 75.8%N 2 . Exhaust gas pressure: 0.1MPa.

[0045] to 100 Nm 3 / h acid gas enters the chemical absorption tower, the pH value of the lye is 8.0, and the circulation volume is 0.5 Nm 3 / h Through gas-liquid countercurrent contact, the chemical absorption of acid gas is realized. Rich CO 2 、H 2 The lye of S enters the biological regeneration tower, CO 2 As a carbon source for microbial growth, HS - In air aeration rate 4m 3 / h, ORP value is maintained in the range of -340mV~-360mV / / The conductivity is stable at about 32 mS / cm, and the HS - Biological oxidation to sulfur. The elemental sulfur was separated by centrifugation, weighing 6kg / h, and the sulfur recovery rate was 98.8%. Rich in COS, CS 2 and CH 3 The acid-poo...

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Abstract

The invention belongs to the field of environmentally-friendly purification, and relates to a method for removing acidic gases through a biological technology. The method is mainly used to remove acidic gas flow containing carbon dioxide, hydrogen sulfide, carbonyl sulfide, carbon disulfide and mercaptan. A chemical absorption, microbial oxidation regeneration and biotrickling filter three-tower technology is adopted, and the chemical absorption characterized in that an alkaline solution is used to absorb carbon dioxide, hydrogen sulfide and a small amount of organic sulfur which are introduced to the alkaline solution; the microbial oxidation regeneration realizes biological oxidation of sulfides into biological sulfur under aeration conditions and alkaline solution regeneration; and biotrickling filter purification of organic sulfur is used for removing carbonyl sulfide, carbon disulfide, mercaptan and other organic sulfurs. The method adopting carbon dioxide fixation, sulfur resource recovery, absorption liquid recycling and organic sulfur deodorizing purification realizes acidic gas integral treatment, and solves the environmental protection problem of acidic gas pollution.

Description

technical field [0001] The invention belongs to biological environmental protection technology and is applied in the field of acid gas purification, in particular to a method for removing acid gas by biological method, which is mainly used for natural and industrial fluid flow such as natural gas, synthetic gas, fuel gas, refinery gas , Purification of acid gases in biogas and hydrocarbon gas streams, and at the same time realize the recovery of carbon sequestration and sulfur resources. Background technique [0002] In the process of chemical production such as natural gas purification, coal gasification, oil refining and catalytic cracking in refineries, such as natural gas, synthesis gas, fuel gas, refinery gas, biogas and hydrocarbon gas streams, such as carbon dioxide, hydrogen sulfide and carbon disulfide will be produced. , carbonyl sulfide and / or mercaptans and other acid gases. For reasons such as meeting product specifications and standards, safety and environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/84B01D53/48B01D53/50B01D53/52C02F3/34C02F103/18
CPCY02A50/20
Inventor 孔京郝爱香毛松柏孔凡敏
Owner CHINA PETROLEUM & CHEM CORP
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