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Absorption liquid for separating carbon dioxide from normal-pressure gases

A carbon dioxide, absorption liquid technology, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., to achieve the effects of good stability, high solubility, and reduced solvent degradation

Inactive Publication Date: 2015-08-19
JIANGSU RUNFENG ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese Patent Application No. 200510021160.5 has announced the use of MDEA plus diazolane, diazolane and sterically hindered amines to absorb CO2, but only the process of lean liquid and rich liquid and their heat exchange is adopted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare an aqueous solution of 15wt% diethylenetriamine + 15% sulfolane; input the mixed gas containing CO2 and N2 with a temperature of 40°C and a gas phase CO2 partial pressure of 0.5 bar into the solution respectively, and the gas-liquid two phases reach equilibrium , the solubility of CO2 in the absorption solvent is 90g / L; while the solubility of CO2 when the CO2 partial pressure is 0.2bar at 120°C is 20g / L; thus, the separation of 70g / L of CO2 is achieved every time the solution is circulated.

Embodiment 2

[0020] Prepare an aqueous solution of 15wt% diethylenetriamine + 35% sulfolane; input the mixed gas containing CO2 and N2 with a temperature of 40°C and a gas phase CO2 partial pressure of 0.50 bar into the solution respectively, and the gas-liquid two phases reach equilibrium , the solubility of CO2 in the absorption solvent is 95g / L; while the solubility of CO2 when the CO2 partial pressure is 0.2bar at 120°C is 7g / L; thus, the separation of 88g / L of CO2 is achieved every time the solution is circulated.

Embodiment 3

[0022] Prepare an aqueous solution of 30wt% diethylenetriamine + 15% sulfolane; input the mixed gas containing CO2 and N2 with a temperature of 40°C and a gas phase CO2 partial pressure of 0.25 bar into the solution respectively, and the gas-liquid two phases reach equilibrium , the solubility of CO2 in the absorption solvent is 161g / L; while the solubility of CO2 when the CO2 partial pressure is 0.25bar at 120°C is 40g / L; thus the solution can achieve 121g / L of CO2 separation per cycle.

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PUM

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Abstract

The invention discloses an absorption liquid for separating carbon dioxide from normal-pressure gases. The absorption liquid consists of diethylenetriamine, sulfolane, the balance of water or water and other additives. The absorption liquid disclosed by the invention has the advantages that the diethylenetriamine is a molecule with three amino groups and is matched with the sulfolane as a physical solvent, so that the solubility for the carbon dioxide is great, the desorption effect is good, and energy consumption for separating the carbon dioxidedesorption effect is lower; meanwhile, the stability of the diethylenetriamine molecule is good, so that the degradation of solvent in the use process can be reduced.

Description

technical field [0001] The invention relates to an absorbing liquid for separating carbon dioxide from atmospheric pressure gas. Background technique [0002] The capture and separation of greenhouse gases such as carbon dioxide (CO2) will be applied to flue gas in coal-fired power generation, iron and steel metallurgy, cement, petrochemical, coal chemical and other industries. These gas mixtures generally contain 5% to 35% CO2, and the pressure range of the gas is generally around atmospheric pressure. The separation of CO2 in such gases mainly adopts chemical absorption solvent or chemical-physical composite solvent absorption method. [0003] At present, the more mature chemical absorption methods in the industry at home and abroad mainly contain monoethanolamine (MEA), diethanolamine (DEA), diisopropanolamine (DIPA), methyldiethanolamine (MDEA) and 2-amino -Aqueous solutions such as 2-methyl-1-propanol (AMP) and their mixed solutions as a main component. For example, ...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCY02C20/40
Inventor 黄永权陈健施建超俞惠
Owner JIANGSU RUNFENG ENVIRONMENTAL ENG
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