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Absorbing agent for catching or separating carbon dioxide

A carbon dioxide and absorbent technology, applied in separation methods, through absorption, dispersed particle separation, etc., can solve the problems of high degradation and high cost of use, and achieve the effects of high solubility, reduced desorption energy consumption, and low energy consumption

Active Publication Date: 2012-06-20
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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  • Absorbing agent for catching or separating carbon dioxide
  • Absorbing agent for catching or separating carbon dioxide
  • Absorbing agent for catching or separating carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Get three parts of N-ethylethanolamine (EMEA) content is 10wt%, sulfolane (TMS) content is 10wt% aqueous solution (i.e. 80% water), the temperature is 40 ℃, gas phase CO 2 Partial pressure of 10kPa, 45kPa, 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 N-ethylethanolamine and CO in the absorption solvent 2 See Table 1 for the solubility.

[0027] Table 1 Experimental results of aqueous solution of 10wt% N-ethylethanolamine+10wt% sulfolane at 40°C

[0028]

Embodiment 2

[0030] Get three parts of N-ethylethanolamine content is 10wt%, sulfolane content is 10wt% aqueous solution (i.e. 80% water), the temperature is 120 ℃, gas phase CO 2 Partial pressure of 20kPa, 60kPa, 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 N-ethylethanolamine and CO in the absorption solvent 2 See Table 2 for the solubility.

[0031] Table 2 Experimental results of 120°C, 10wt% N-ethylethanolamine+10wt% sulfolane aqueous solution

[0032]

Embodiment 3

[0034] Get three parts of N-ethylethanolamine content and be 22wt% and sulfolane content be the aqueous solution (that is 48% water) of 30wt%, the temperature is 40 ℃, gas phase CO 2 Partial pressure of 8.6kPa, 18kPa, 63kPa 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 N-ethylethanolamine and CO in the absorption solvent 2 See Table 3 for the solubility.

[0035] Table 3 Experimental results of 40°C, 22wt% N-ethylethanolamine+30wt% sulfolane aqueous solution

[0036]

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Abstract

The invention relates to an absorbing agent for catching or separating carbon dioxide from gas mixture, which mainly comprises the components by weight percent: 10-50wt% of N-ethylethanolamine, 10-40wt% of tetramethylene sulfone and balance water. The absorbing agent adopts the N-ethylethanolamine as effective component, and the N-ethylethanolamine 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 has the functions of improving the desorbing effect and reducing the volatilization of water, so that the energy consumption of desorbing is further reduced. The absorbing agent 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 ) 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 relatively m...

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 陈健郭东方费维扬骆广生
Owner TSINGHUA UNIV
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