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Solvent for absorbing and separating carbon dioxide in atmospheric pressure gas

A carbon dioxide and gas technology, applied in the direction of chemical separation, separation method, dispersed particle separation, etc., to achieve the effect of reducing solvent degradation, good desorption effect and low energy consumption

Active Publication Date: 2012-12-12
JIANGSU RUNFENG ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as Chinese patent application number 200510021160.5, announced the use of MDEA plus diazolane, diazolane and sterically hindered amine to absorb CO 2 , but only lean liquid and rich liquid and their heat transfer process are adopted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare an aqueous solution of 25wt% N,N-methylethylethanolamine + 3wt% monoethanolamine at a temperature of 40°C\gas phase CO 2 Partial pressure of 0.5 bar containing CO 2 The mixed gas of N2 and N2 is input into the solution respectively, and after the gas-liquid two-phase reaches equilibrium, the CO in the solvent is absorbed 2 The solubility is 45g / L, while at 120°C CO 2 CO at 0.2 bar partial pressure 2 Solubility is 19g / L; achieve 26g / L circulation separation.

Embodiment 2

[0020] Prepare an aqueous solution of 35wt% N,N-methylethylethanolamine + 5wt% 2-amino-2-methyl-1-propanol at a temperature of 40°C in gas phase CO 2 Partial pressure of 0.15 bar containing CO 2 The mixed gas of N2 and N2 is input into the solution respectively, and after the gas-liquid two-phase reaches equilibrium, the CO in the solvent is absorbed 2 The solubility is 68g / L, while at 120°C CO 2 CO at a partial pressure of 0.46 bar 2 Solubility is 27g / L; achieve 41g / L circulation separation.

Embodiment 3

[0022] Prepare an aqueous solution of 45wt% N,N-methylethylethanolamine + 9wt% piperazine, set the temperature at 40°C, and gas-phase CO 2 Partial pressure of 0.25 bar containing CO 2 The mixed gas of N2 and N2 is input into the solution respectively, and after the gas-liquid two-phase reaches equilibrium, the CO in the solvent is absorbed 2 The solubility is 78g / L, while at 120°C CO 2 CO at a partial pressure of 0.36 bar 2 Solubility is 17g / L; achieve 61g / L circulation separation.

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PUM

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Abstract

The invention discloses an absorption solution for absorbing and separating carbon dioxide from atmospheric pressure gas, which comprises 25-55% of N,N-methylethylethanolamine, 3-9% of primary amine or secondary amine and the balance of water. The N,N-methylethylethanolamine, which is a tertiary amine with lower molecular weight, is matched with less than or equal to 9% of primary amine or secondary amine, and thus, the solvent the advantages of has high solubility for carbon dioxide, favorable desorption effect, and low energy consumption for separation of carbon dioxide. Meanwhile, the N,N-methylethylethanolamine has high molecular stability, and can lower the degradation of the solvent in the use process.

Description

technical field [0001] The invention relates to the technical fields of energy metallurgy, chemical industry and gas separation, in particular to a solution for absorbing and separating carbon dioxide from atmospheric pressure gas. Background technique [0002] carbon dioxide (CO 2 ) and other greenhouse gas capture and separation, and the amount is 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% CO 2 , The pressure range of the gas is generally around atmospheric pressure. And the CO in this kind of gas 2 The separation mainly adopts chemical absorption solvent or chemical-physical composite solvent absorption method. [0003] At present, the relatively mature chemical absorption method in the industry at home and abroad absorbs and separates CO 2 The solutions mainly include monoethanolamine (MEA), diethanolamine (DEA), diisopropanol...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/62
CPCY02C10/04Y02C20/40
Inventor 陈健黄永权施建超俞惠
Owner JIANGSU RUNFENG ENVIRONMENTAL ENG