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Composite absorbent for recovering CO2 from exhaust gas

An absorbent and waste gas technology, applied in gas treatment, membrane technology, dispersed particle separation, etc., can solve the problems of slow absorption rate of absorbent, strong equipment corrosion, high energy consumption for regeneration, and achieve fast absorption rate and large absorption capacity. , The effect of low regeneration energy consumption

Inactive Publication Date: 2016-03-30
SINOPEC ENERGY & ENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Chinese patent CN103239970A published on August 14, 2013 discloses a method for catalytic cracking to regenerate CO in flue gas 2 Captured composite absorbent to solve the problems of slow absorption rate, small capacity, high regeneration energy consumption and strong corrosion to equipment in the existing technology
[0011] Although the above solvent patents have their own advantages, their comprehensive decarburization ability is generally low, the desorption energy consumption is high, and the regeneration temperature is high, so there is room for improvement in many aspects

Method used

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  • Composite absorbent for recovering CO2 from exhaust gas
  • Composite absorbent for recovering CO2 from exhaust gas
  • Composite absorbent for recovering CO2 from exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare 300L composite absorbent, wherein the content of main absorbent component triethanolamine and tertiary propanolamine are 15wt% and 5wt% respectively, and the content of auxiliary absorbent component 2-amino-2-methyl-1-propanol 5wt%, the content of malonic acid and succinic acid in consumption reducer components is 1wt%, 1wt% respectively, the content of water is 40wt%, and the content of propanol in organic solvent component is 33wt%.

[0031] Test 1: Absorption and desorption test of composite absorbent

[0032] refer to figure 1 , the temperature is 45 °C, the gas phase CO 2 The partial pressure is 0.1MPa, the volume fraction is 15% containing CO 2 , O 2 and N 2 The mixed gas (simulated oilfield associated gas) is input into the 1000Nm gas filled with the above composite absorbent 3 / dCO 2 Pilot test device for capture continuous test, in which the diameter of the absorption tower is 200mm, the height of the tower is 16m, the height of the packing layer ...

Embodiment 2

[0036] Prepare 300L composite absorbent, wherein, the main absorbent component N-methyldiethanolamine content is 21.5wt%, and the absorption aid components piperazine and methylethanolamine content are respectively 3wt% and 3.5wt%, reducing consumption The content of the agent component glutaric acid is 2wt%, the content of water is 40wt%, and the content of the organic solvent component propanol and isobutanol is respectively 15wt% and 15wt%.

[0037] The test process is the same as in Example 1, and the relevant data are shown in Table 2.

[0038] Table 2 Composite absorbent absorption, desorption test results

[0039]

Embodiment 3

[0041] Prepare 300L composite absorbent, wherein, the content of main absorbent components N-methyldiethanolamine and ethylamine are 15wt% and 5wt% respectively, the content of auxiliary absorption agent component diethanolamine is 5wt%, and the consumption reducer component The content of adipic acid is 2wt%, the content of water is 40wt%, and the content of organic solvent component butanone is 33wt%.

[0042] The test process is the same as in Example 1, and the relevant data are shown in Table 3.

[0043] Table 3 Composite absorbent absorption, desorption test results

[0044]

[0045]

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Abstract

The present invention provides a composite absorbent for recovering CO2 from exhaust gas. The composite absorbent comprises a main absorbent, an assistant absorbent, a consumption reducing agent, water and an organic solvent; the main absorbent is selected from one or more of triethanolamine, tert-propanolamine, N-methyldiethanolamine, ethylamine, propylamine, isopropylamine, n-butylamine, n-pentylamine, isopentylamine, diisobutylamine and isobutylamine; the assistant absorbent is selected from one or more of 2-amino-2-methyl-1-propanol, piperazine, methylethanolamine, diethanolamine and n-propanol amine; the consumption reducing agent is selected from one or more of malonic acid, succinic acid, glutaric acid and adipic acid; and the organic solvent is selected from one or more of propanol, isopropanol, isobutanol, propanone, butanone, ethyl acetate and butyl acetate. The composite absorbent for recovering CO2 from exhaust gas has the advantages of quick absorption speed, large absorption capacity, low regeneration energy consumption, good stability, high purification degree, good desorption effect and the like.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and in particular relates to a method for recovering CO in waste gas. 2 composite absorbent. Background technique [0002] CO in natural gas and oilfield associated gas 2 The content is 15%-50% (volume fraction), how to efficiently separate and recover CO 2 More and more attention has been paid to it. At present, the chemical solvent absorption method captures CO in exhaust gas 2 Technology is currently recognized worldwide as one of the effective ways to mitigate the greenhouse effect and is most suitable for industrial operation. [0003] Conventional single absorbents are characterized by high absorption efficiency, but difficult regeneration, high regeneration energy consumption (such as MEA, DEA), or low regeneration energy consumption, but low absorption efficiency (such as N-methyldiethanolamine (MDEA)) . In this way, the research on mixed absorbents that can satisfy both high ...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/1493B01D2252/202B01D2252/20405B01D2252/20447B01D2252/20484B01D2252/20489B01D2252/205B01D2257/504
Inventor 陆诗建张建李清方刘海丽张启阳祝威尚明华张媛媛陆胤君文海力
Owner SINOPEC ENERGY & ENVIRONMENTAL ENG CO LTD
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