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Weak-polarity amino absorbent for capturing low-concentration flue gas CO2

A weakly polar solvent and weakly polar technology, applied to the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problem of increased system investment and operating costs, high absorbent circulation flow, and reduced energy consumption in the regeneration process, etc. problems, achieve the effect of small latent heat of water evaporation, high CO2 cycle capacity, and reduce regeneration energy consumption

Pending Publication Date: 2022-01-11
ZHEJIANG ZHENENG TECHN RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CO in coal / gas flue gas 2 low concentrations of CO 2 The partial pressure is about 4 ~ 15kPa, the CO of the amine-based absorbent 2 Slow absorption rate and small absorption capacity lead to large absorption tower size, high absorbent circulation flow rate, and increased system investment and operating costs
Moreover, most of the existing water-less or water-free absorbents use monoethanolamine as the main agent (primary amine), and the heat of reaction is relatively high, so the reduction of energy consumption in the regeneration process is limited.

Method used

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  • Weak-polarity amino absorbent for capturing low-concentration flue gas CO2
  • Weak-polarity amino absorbent for capturing low-concentration flue gas CO2
  • Weak-polarity amino absorbent for capturing low-concentration flue gas CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Configure weakly polar amine-based absorbent #1: Measure 38 grams of 2-methylaminoethanol, 47 grams of diethylene glycol dimethyl ether, and 15 grams of deionized water, stir and mix evenly, keep warm in a water bath to 40°C, and set aside .

[0034] Configure comparative absorbent #1: Measure 30 grams of monoethanolamine and 70 grams of deionized water, stir and mix evenly, place in a water bath to keep warm at 40°C, and set aside.

[0035] CO 2 Absorption experiment: The prepared absorbent was added into a self-made bubbling absorption reactor, nitrogen (N 2 ) and CO 2 The mixed gas is fed into the absorption reactor, the total flow rate is 1L / min, the pressure is normal pressure, CO 2 The volume concentration is 12%, the temperature is controlled by a water bath at 40°C, and the absorption time is 50 minutes, during which the CO of the outlet gas is recorded in real time 2 concentration.

[0036] CO 2 Desorption experiment: Absorbed CO 2 The absorbent is trans...

Embodiment 2

[0039] Configure weakly polar amine-based absorbent #2: Measure 35 grams of 2-ethylaminoethanol, 42 grams of ethylene glycol butyl ether, 10 grams of N-methyldiethanolamine, and 13 grams of deionized water, stir and mix well, place in Keep warm in a water bath to 40°C and set aside.

[0040] CO measurement of weakly polar amine-based absorbent #2 2 Absorption rate, CO 2 Desorption rate, CO 2 The degree of desorption and the absorption-desorption cycle capacity are obtained as figure 2 Absorption load vs. time curves for weakly polar amine-based absorbent #2 are shown, and the results show that the average CO 2 Absorption rate increased by 35%, initial CO 2 69% faster desorption rate, average CO 2 110% faster desorption rate, CO 2 The degree of desorption is increased by 93%, the absorption-desorption cycle capacity is increased by 66%, and the estimated regeneration energy consumption is reduced by 45%.

Embodiment 3

[0042] Configure weakly polar amine-based absorbent #3: Measure 41 grams of 2-butylaminoethanol, 31 grams of 1,4-diazidebicyclooctane, 18 grams of 1-amino-2-methyl-2-propanol, 10 grams of deionized water, stirred and mixed evenly, placed in a water bath to keep warm to 40°C, and set aside.

[0043] CO measurement of weakly polar amine-based absorbent #3 2 Absorption rate, CO 2 Desorption rate, CO 2 The degree of desorption and the absorption-desorption cycle capacity are obtained as image 3 Absorbent load vs. time curves for weakly polar amine-based absorbent #3 are shown, and the results show that the average CO 2 Absorption rate increased by 23%, initial CO 2 41% faster desorption rate, average CO 2 65% faster desorption rate, CO 2 The degree of desorption is increased by 41%, the absorption-desorption cycle capacity is increased by 58%, and the estimated regeneration energy consumption is reduced by 37%.

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Abstract

The invention relates to a weak-polarity amino absorbent for capturing low-concentration flue gas CO2. The weak-polarity amino absorbent comprises an alcohol amine main agent, a weak-polarity solvent, an absorption enhancer, a corrosion inhibitor and water. The weak-polarity amino absorbent has beneficial effects that the alcohol amine main agent has at least one secondary amino group, and the reaction heat is lower than that of a primary amino group, so that the regeneration energy consumption can be reduced; the polarity of the weak-polarity solvent is lower than that of benzene, according to the similar dissolvability principle, CO2 is a non-polar molecule, the physical solubility of CO2 in the non-(weak) polar solvent is high, the barren liquor load is low, according to a double-membrane mass transfer model, the physical solubility of CO2 is improved, the CO2 absorption rate of the absorbent is improved, and the absorbent is suitable for capturing low-concentration flue gas CO2; the alcohol amine main agent and the absorption enhancer are used as mixed amine, so that degradation and corrosion increase of the absorbent are possibly caused, and the stability of the absorbent is improved by adding a trace amount of an anti-degradation agent and the corrosion inhibitor.

Description

technical field [0001] The invention belongs to flue gas CO 2 Capture technical field, especially related to a low-concentration flue gas CO 2 Trapped by weakly polar amine-based absorbents. Background technique [0002] Coal-fired power plants and industrial flue gas are my country's largest CO 2 Fixed emission source, chemical absorption method based on organic amine absorbent can be applied to flue gas CO on a large scale 2 catch. [0003] Monoethanolamine aqueous solution (mass concentration of 20% to 30%) is the most commonly used CO 2 Absorbent, at low temperature (about 40°C), monoethanolamine and CO in flue gas 2 A chemical reaction takes place in the absorber to absorb CO 2 After the absorbent is pumped to the regeneration tower, a reverse reaction occurs at a temperature of 100-120°C, and CO is desorbed. 2 , the regenerated absorbent is sent to cycle to absorb CO 2 . Monoethanolamine absorbent has been applied to million-ton / year coal-fired power plant flu...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/1493B01D53/1475B01D2252/20478B01D2252/60B01D2252/606Y02C20/40
Inventor 祁志福刘飞高强生孙士恩方梦祥胡杭天
Owner ZHEJIANG ZHENENG TECHN RES INST
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