Mixed absorbent for gathering or separating carbon dioxide

A carbon dioxide and absorbent technology, applied in the direction of absorption, carbon compounds, separation methods, etc., can solve the problems of high cost of use, high degradation, etc., and achieve the effects of low heat of reaction, high solubility, and low energy consumption

Inactive Publication Date: 2011-04-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the special structure of these hindered amines, the degradation during use is relatively large, and the cost of use is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Diethylethanolamine (DEEA) and monoethanolamine (MEA) with a weight ratio of 4.2:1 were directly mixed to prepare absorbent raw materials.

[0029] In application, according to the weight of diethylethanolamine and monoethanolamine as the raw materials of the absorbent: 21wt%; 5.0wt%, dissolved in water with a weight percentage of 75wt%, to obtain the absorbent.

[0030] CO in flue gas at 40°C 2 Absorption occurs when the partial pressure is 9.8kPa, CO at 120°C 2 Desorption is carried out when the partial pressure is 55kPa, and 1 liter of 21wt% DEEA + 5.0wt% MEA aqueous solution can absorb and separate CO 2 The amount is 79-21=58 grams;

Embodiment 2

[0032] Diethylethanolamine (DEEA) and primary amine monoethanolamine (MEA) in a weight ratio of 4.5:0.99 are directly mixed to prepare absorbent raw materials.

[0033] In application, according to the weight of diethylethanolamine and monoethanolamine as the raw materials of the absorbent: 45wt%; 9.9wt%, dissolved in water with a weight percentage of 45.1wt%, to obtain the absorbent.

[0034] CO in flue gas at 40°C 2 Absorption occurs when the partial pressure is 15kPa, CO at 120°C 2 Desorption is carried out when the partial pressure is 80kPa, and 1 liter of 45wt% DEEA + 9.9wt% MEA aqueous solution can absorb and separate CO 2 The amount is 128-35=93 grams;

Embodiment 3

[0036] Take diethylethanolamine (DEEA) and ethylethanolamine (EAE) with a weight ratio of 5:1 and directly mix them to prepare absorbent raw materials.

[0037] In application, according to the weight of diethylethanolamine and ethylethanolamine as the raw materials of the absorbent: 25wt%; 5.0wt%, dissolved in water with a weight percentage of 70wt%, to obtain the absorbent.

[0038] CO in flue gas at 40°C 2 Absorption occurs when the partial pressure is 15kPa, CO at 120°C 2 Desorption is carried out when the partial pressure is 80kPa, and 1 liter of 25wt% DEEA + 5wt% EAE aqueous solution can absorb and separate CO 2 The amount is 85-20=65 grams;

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PUM

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Abstract

The invention relates to a mixed absorbent for gathering or separating carbon dioxide from a gas mixture, which mainly comprises the following components in percentage by weight: 21 to 45 percent of diethylethylenediamine, 5.0 to 9.9 percent of primary amine containing one nitrogen atom and / or secondary amine containing one nitrogen atom, and the balance of water. The absorbent has high solubility and good desorption effect on low-pressure carbon dioxide, simultaneously absorbs less reaction heat, and has low energy consumption for gathering or separating the low-pressure carbon dioxide; because the diethylethylenediamine is tertiary amine and has high boiling point and better molecular stability than the primary amine and secondary amine, so the degradation loss of a solvent in the using process can be greatly reduced. The mixed absorbent can be used for gathering or separating various normal-pressure gas mixtures, such as carbon dioxide in flue gas discharged from coal fired power plants, and enterprises in the steel, cement, petrochemical engineering and other industries.

Description

technical field [0001] The invention relates to the technical field of chemical materials and gas separation, in particular to a method for capturing or separating carbon dioxide (CO 2 ) of the mixed absorbent. Background technique [0002] CO 2 Emissions of greenhouse gases such as greenhouse gases are a major factor causing climate change, how to enrich CO 2 In the gas mixture, the capture or separation of CO 2 becomes extremely important. These gas mixtures include flue gas emitted by coal-fired power plants, iron and steel cement, petrochemical and other enterprises. These gas mixtures generally contain 5% to 30% CO 2 , other major gas components include N 2 , O 2 , CO, H 2 、CH 4 、C 2 h 6 , SO 2 、H 2 S and organic sulfur CH 3 S, COS, etc.; the pressure range of the gas is large (50-9000kPa), suitable for capturing and separating CO by chemical absorption or chemical-physical composite absorption 2 components. [0003] At present, the relatively mature che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C01B31/20C01B32/50
CPCY02C10/06Y02C20/40Y02P20/151
Inventor 陈健刘延鑫于燕梅密建国
Owner TSINGHUA UNIV
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