Ternary double liquid phase absorbent for treating carbon dioxide in flue gas

A carbon dioxide and absorbent technology, applied in gas treatment, chemical instruments and methods, separation methods, etc., can solve the problems of no research on special effects, only binary systems, and unsatisfactory absorption load, etc., and achieve excellent phase separation characteristics and obvious The effect of heat reduction

Active Publication Date: 2019-08-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese invention patent "A method for two-phase absorption and removal of carbon dioxide from a gas mixture" (application number 201310631961.8, published on March 26, 2014) works using one or more enamines and one or more organic solvents Mixed and did not study the effect of water content in the solvent to control the content of organic solvent added, and only used primary or secondary amines, the absorption load is not ideal
Chinese invention patent "capturing CO in exhaust gas 2 "Phase Change Absorbent" (Application No. 201811243424.5, published on February 15, 2019), the proposed phase change absorber is doped with various nanoparticles, corrosion inhibitors, antioxidants and defoamers, and the combination of solvents The ratio is more accurate, and the water content also has a selection range, but the amine is a monoamine instead of a mixed amine, and the absorption effect is not as good as that of the mixed amine.
Chinese invention patent "a phase-change organic amine absorbent" (application number 201710727948.0, published on March 5, 2019) forms an organic phase and a carrier phase in the process of removing acid gases, not the traditional organic amine absorption agent, and only a binary system, no special effects of more components have been studied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add water to triethylenetetramine (TETA), diethylaminoethanol (DEEA) and 1,3-dimethyl-2-imidazolidinone (DMI) to form a 30ml ternary absorbent, the total amine concentration is 4mol / L, the TETA concentration is 1mol / L, the mass fraction of TETA is 15%, the DEEA concentration is 3mol / L, the mass fraction of DEEA is 35%, the mass fraction of inert solvent DMI is 25%, and the mass fraction of water is 25% . Under the water bath of 40 ℃, under normal pressure, the nitrogen gas of 85% and the carbon dioxide of 15% are passed into by volume fraction until the absorbent is saturated, and the upper (lean) liquid phase of the absorbent is 11.8ml, CO 2 The load is 0.15mol / L, the lower (rich) liquid phase is 15.1ml, CO 2 The load is 4.47mol / L, with nearly 96.7% CO 2 Loaded in the lower liquid phase, the total load is 0.64mol / mol, which is 1.23 times that of MEA. See Table 1 for energy consumption.

Embodiment 2

[0030]Add water to triethylenetetramine (TETA), diethylaminoethanol (DEEA) and N,N-dimethylformamide (DMF) to make 30ml ternary absorbent, the concentration of TETA is 1mol / L, the mass of TETA The fraction is 15%, the DEEA concentration is 3mol / L, the mass fraction of DEEA is 35%, the mass fraction of the inert solvent DMF is 25%, and the mass fraction of water is 25%. Under the water bath of 40 ℃, under normal pressure, the volume fraction of 85% nitrogen and 15% carbon dioxide is introduced until the absorption of the absorbent is saturated, the upper (lean) liquid phase of the absorbent is 9.8ml, CO 2 The load is 0.34mol / L, the lower (rich) liquid phase is 17.8ml, CO 2 With a load of 4.35mol / L, nearly 92.7% of CO 2 Loaded in the lower liquid phase, the total load is 0.73mol / mol, which is 1.40 times that of MEA. See Table 1 for energy consumption.

Embodiment 3

[0032] Add water to triethylenetetramine (TETA), diethylaminoethanol (DEEA) and sulfolane to make 30ml ternary absorbent, the concentration of TETA is 1mol / L, the mass fraction of TETA is 15%, and the concentration of DEEA is 3mol / L , the mass fraction of DEEA is 35%, the mass fraction of the inert solvent sulfolane is 25%, and the mass fraction of water is 25%. Under the water bath of 40 ℃, under normal pressure, the volume fraction of passing through is 85% nitrogen and 15% carbon dioxide until the absorption of the absorbent is saturated, the upper (lean) liquid phase of the absorbent is 8ml, CO 2 The load is 0.38mol / L, the lower (rich) liquid phase is 20ml, CO 2 Load 3.91mol / L, nearly 91.1% CO 2 Loaded in the lower liquid phase, the total load is 0.73mol / mol, which is 1.40 times that of MEA. See Table 1 for energy consumption.

[0033] Table 1 Comparison of regeneration energy consumption of ternary dual-liquid phase absorbent

[0034] absorbent Regeneration ...

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PUM

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Abstract

The invention discloses a ternary double-liquid absorbent for treating carbon dioxide in flue gas. The ternary double-liquid absorbent is a mixed aqueous solution prepared from triethylenetetramine, diethylaminoethanol, inert solvent and water, wherein the mass fraction of the triethylenetetramine is 10%-30%, the mass fraction of the diethylaminoethanol is 30%-40%, the mass fraction of the inert solvent is 20%-35%, and the mass fraction of the water is 20%-35%. The carbon dioxide load of the ternary double liquid phase absorbent of the invention is about 1.23 to 1.40 times that of the traditional absorbent ethanolamine, most carbon dioxide is enriched in the lower liquid phase, the lower phase is used for desorption, the regeneration heat is 0.61 to 0.64 of ethanolamine, and the energy consumption is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of gas separation, and in particular relates to a ternary two-liquid-phase absorbent for treating carbon dioxide in flue gas. Background technique [0002] Since the Industrial Revolution, human industrial activities have increased dramatically, and CO emissions from factories 2 The greenhouse effect has become more and more significant, which has triggered a series of environmental disasters and climate anomalies. Reduce CO 2 Emissions have become a hot issue in the world today. [0003] CO 2 The main ways to reduce emissions are to improve energy efficiency, develop alternative energy sources and apply carbon capture and storage (CCS) technology. CCS technology can reduce CO 2 The cost of emissions is one of the main emission reduction technologies at present. Coal-fired power plant CO 2 Emissions are the largest, and more concentrated and fixed, and are the main areas for large-scale application of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D53/1493B01D53/1475B01D2252/204B01D2252/504B01D2258/0283
Inventor 蒋辰开沈遥张士汉
Owner ZHEJIANG UNIV OF TECH
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