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Absorption solvent used for catching or separating carbon dioxide

A technology for absorbing solvents and carbon dioxide, applied in separation methods, through absorption, separation of dispersed particles, etc., can solve the problems of high cost of use, more degradation, etc., and achieve the effects of low heat of reaction, high solubility, and good stability

Active Publication Date: 2012-03-28
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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  • Absorption solvent used for catching or separating carbon dioxide
  • Absorption solvent used for catching or separating carbon dioxide
  • Absorption solvent used for catching or separating carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Get three parts of 3-dimethylamino-1-propanol aqueous solution, wherein, the content of 3-dimethylamino-1-propanol is 10wt%, all the other are composed of monoethanolamine, dimethylsulfoxide, K 2 CO 3 , corrosion inhibitor and water solvent. Set the temperature at 40 °C, gaseous CO 2 Partial pressure of 9kPa, 45kPa, 120kPa 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 and 3-dimethylamino-1-propanol (DMA1P) molar ratio and CO in the absorption solvent 2 See Table 1 for the solubility.

[0014] Table 1 Experimental results of 10wt% 3-dimethylamino-1-propanol aqueous solution at 40°C

[0015]

Embodiment 2

[0017] Get three parts of 3-dimethylamino-1-propanol aqueous solution, wherein, the content of 3-dimethylamino-1-propanol is 10wt%, all the other are composed of monoethanolamine, dimethylsulfoxide, Na 2 CO 3 , corrosion inhibitor and water solvent. Set the temperature at 120°C, gaseous CO 2 Partial pressure of 21kPa, 70kPa, 115kPa 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 and 3-dimethylamino-1-propanol (DMA1P) molar ratio and CO in the absorption solvent 2 See Table 2 for the solubility.

[0018] Table 2 Experimental results of 120°C, 10wt% 3-dimethylamino-1-propanol aqueous solution

[0019]

Embodiment 3

[0021] Get three parts of 3-dimethylamino-1-propanol aqueous solution, wherein, the content of 3-dimethylamino-1-propanol is 25wt%, all the other are made of n-propanolamine, sulfolane, K 2 CO 3 , corrosion inhibitor and water solvent. Set the temperature at 40 °C, gaseous CO 2 Partial pressure of 10kPa, 19kPa, 70kPa 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 and 3-dimethylamino-1-propanol (DMA1P) molar ratio and CO in the absorption solvent 2 See Table 3 for the solubility.

[0022] Table 3 Experimental results of 40°C, 25wt% 3-dimethylamino-1-propanol aqueous solution

[0023]

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PUM

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Abstract

The invention belongs to the field of chemical materials, and particularly relates to an absorption solvent which is used for collecting or separating carbon dioxide from gas mixture or liquefied gas. The solvent comprises 3-dimethylamino-1-propanol (abbreviated as DMA1P) with a content range of 10-70 wt% and other components with a total content range of 30-90 wt%, wherein, the other components comprise one or more of monoethanol amine, n-propanol amine, hydroxyethyl piperazine, water, physical solvent, inorganic salt or auxiliary agent. The solubility of carbon dioxide in 3-dimethylamino-1-propanol is high and the deabsorption effect is good; simultaneously the reaction heat of the absorption reaction is lower and the energy consumption for collecting or separating carbon dioxide is lower; meanwhile, 3-dimethylamino-1-propanol is a tertiary amine, the carbon chain is a linear chain, six-membered ring with better molecular stability can be formed through hydrogen bond, and the degradation loss of solvent in the use process can be reduced substantially.

Description

technical field [0001] The invention belongs to the field of chemical materials, in particular to an absorption solvent for capturing or separating carbon dioxide from gas mixture or liquefied gas. 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 capture or separation of CO in a gas mixture or liquefied gas 2 becomes extremely important. These gas mixtures include flue gas, refinery gas, natural gas, liquefied gas, synthesis gas, shift gas and hydrogen production gas, among others. The gas mixture contains 5% to 80% 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 chem...

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 陈健董立户高光华
Owner TSINGHUA UNIV
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