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Mixed absorbing agent for catching 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

Active Publication Date: 2012-05-23
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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  • Mixed absorbing agent for catching or separating carbon dioxide
  • Mixed absorbing agent for catching or separating carbon dioxide
  • Mixed absorbing agent for catching or separating carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get three parts of 3-dimethylamino-1-propanol (DMAP) content is 10wt%, primary amine monoethanolamine (MEA) content is 5.1wt% aqueous solution (i.e. 84.9% water), temperature is 40 ℃, will gas phase CO 2 Partial pressure of 9.8kPa, 46kPa, 90kPa containing CO 2 and N 2 The mixed gas of the mixed gas is input into three parts of the solvent respectively, and after the gas-liquid two-phase reaches equilibrium, the CO in the absorbent 2 The molar ratio of the amine to the amine and the CO in the absorbent 2 See Table 1 for the solubility.

[0027] Table 1 Experimental results of aqueous solution of 10wt% 3-dimethylamino-1-propanol+5.1wt% monoethanolamine at 40°C

[0028]

Embodiment 2

[0030] Get three parts of 3-dimethylamino-1-propanol content is 10wt%, monoethanolamine content is 5.1wt% aqueous solution (i.e. 84.9% water), temperature is 120 ℃, gas phase CO 2 Partial pressure of 25kPa, 55kPa, 100kPa containing CO 2 and N 2 The mixed gas of the mixed gas is input into three parts of the solvent respectively, and after the gas-liquid two-phase reaches equilibrium, the CO in the solvent is absorbed 2 The molar ratio of the amine to the amine and the CO in the absorbing solvent 2 See Table 2 for the solubility.

[0031] Table 2 Experimental results of 120°C, 10wt% 3-dimethylamino-1-propanol + 5.1wt% monoethanolamine aqueous solution

[0032]

Embodiment 3

[0034] Get three parts of 3-dimethylamino-1-propanol content is 50wt%, monoethanolamine content is 9.9wt% aqueous solution (i.e. 40.1% water), temperature is 40 ℃, gaseous phase CO 2 Partial pressure of 15kPa, 30kPa, 80kPa containing CO 2 and N 2 The mixed gas of the mixed gas is input into three parts of the solvent respectively, and after the gas-liquid two-phase reaches equilibrium, the CO in the solvent is absorbed 2 The molar ratio of the amine to the amine and the CO in the absorbing solvent 2 See Table 3 for the solubility.

[0035] Table 3 Experimental results of aqueous solution of 50wt% 3-dimethylamino-1-propanol + 9.9wt% monoethanolamine at 40°C

[0036]

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PUM

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Abstract

The invention relates to a mixed absorbing agent for catching or separating carbon dioxide from gas mixture, which mainly comprises the components by weight percent: 10-50wt% of 3-dimethyl amino-1-propyl alcohol, 5-10wt% of primary amine and / or secondary amine and balance water. The absorbing agent has high solubility for low-pressure carbon dioxide, good desorbing effect, lower reaction heat of absorption reaction and lower energy consumption for catching or separating the carbon dioxide; and as the 3-dimethyl amino-1-propyl alcohol is a tertiary amine and has high boiling point and better molecular stability than primary amine and secondary amine, so that the mixed absorbing agent can greatly reduce the degradation consumption of solvent in the using process, has good catching effect, and can be used for catching or separating the carbon dioxide in various gas mixtures such as flue gas, refinery gas, natural gas, synthesis gas, shift gas, hydrogen preparation gas and the like.

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 (CO2) from a gas mixture. 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, refinery gas, natural gas, synthesis gas, shift gas and hydrogen production gas, among others. These gas mixtures generally contain 5% to 50% 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14C01B31/20C01B32/50
CPCY02C10/06Y02C20/40Y02P20/151
Inventor 陈健郑奕成赵立伟于燕梅
Owner TSINGHUA UNIV
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