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Absorbing solvent for capturing or separating carbon dioxide from gas mixture or liquid gas

A gas mixture and solvent absorption technology, applied in the direction of absorption, separation methods, and dispersed particle separation, can solve the problems of high cost of use and high degradation, and achieve the effects of low heat of reaction, high solubility, and low energy consumption

Inactive Publication Date: 2009-07-15
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 solvent for capturing or separating carbon dioxide from gas mixture or liquid gas
  • Absorbing solvent for capturing or separating carbon dioxide from gas mixture or liquid gas
  • Absorbing solvent for capturing or separating carbon dioxide from gas mixture or liquid gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Get three parts of 1-dimethylamino-2-propanol aqueous solution, wherein, the content of 1-dimethylamino-2-propanol is 15wt%, all the other are composed of monoethanolamine, dimethyl sulfoxide, 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 1-dimethylamino-2-propanol (DMA2P) molar ratio and CO in the absorption solvent 2 See Table 1 for the solubility.

[0015] Table 1 Experimental results of 1-dimethylamino-2-propanol aqueous solution at 40°C and 15 wt%

[0016]

Embodiment 2

[0018] Get three parts of 1-dimethylamino-2-propanol aqueous solution, wherein, the content of 1-dimethylamino-2-propanol is 15wt%, all the other are composed of monoethanolamine, dimethyl sulfoxide, K 2 CO 3 , corrosion inhibitor and water solvent. Set the temperature at 120°C, gaseous CO 2 Partial pressure of 21kPa, 70kPa, 135kPa 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 1-dimethylamino-2-propanol (DMA2P) molar ratio and CO in the absorption solvent 2 See Table 2 for the solubility.

[0019] Table 2 120°C, 15wt% 1-dimethylamino-2-propanol aqueous solution experimental results

[0020]

Embodiment 3

[0022] Get three parts of 1-dimethylamino-2-propanol aqueous solution, wherein, the content of 1-dimethylamino-2-propanol is 25wt%, all the other are made of n-propanolamine, sulfolane, Na 2 CO 3 , corrosion inhibitor and water solvent. Set the temperature at 40 °C, gaseous CO 2 Partial pressure of 6kPa, 22kPa, 84kPa 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 1-dimethylamino-2-propanol (DMA2P) molar ratio and CO in the absorption solvent 2 See Table 3 for the solubility.

[0023] Table 3 40 ℃, 25wt% 1-dimethylamino-2-propanol aqueous solution experimental results

[0024]

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PUM

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Abstract

The invention belongs to the field of chemical materials, in particular relates to an absorbing solvent for catching and separating carbon dioxide from gas mixture or liquefied gas. The solvent comprises 15 to 60 weight percent of 1-dimethylamino-2-propanol (DMA2P for short) and 40 to 85 weight percent of other components. The other components comprise one or more of monoethanol amine, normal propyl alcohol amine, hydroxyethyl piperazine, 2- methyl piperazine, water, physical solvent, inorganic salt or addition agents. The 1-dimethylamino-2-propanol has large solubility to the carbon dioxide, good desorption effect, lower reaction heat of absorption reaction and lower energy consumption to the catching and the separation of the carbon dioxide. Meanwhile, the 1-dimethylamino-2-propanol is a tertiary amine, has better molecule stability and can reduce the degradation loss of the solvent in the using process.

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 Applications(China)
IPC IPC(8): B01D53/14C01B31/20
CPCY02C10/06Y02C20/40
Inventor 陈健董立户高光华
Owner TSINGHUA UNIV
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