Acidic gas absorbing agent, method for removing acidic gas and apparatus for removing acidic gas

Patent metadata

Field	Value
Publication number	US-9446346-B2
Application number	US-201514937209-A
Country	US
Kind code	B2
Filing date	Nov 10, 2015
Priority date	Nov 14, 2014
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

There is provided an acidic gas absorbing agent that is large in absorption amount and high in absorption rate of an acidic gas per unit volume and can prevent the diffusion of ingredients of the absorbing agent. The acidic gas absorbing agent includes an amino acid salt of formula 1 or formula 2 and an amine compound of formula 3.

wherein COOMe represents a carboxylate group; Me represents an alkali metal. R 1 and R 2 represent an C1-4 alkylene chain; R 3 represents a cycloalkyl group; R 4 represents a hydrogen atom or an C1-4 alkyl group; and R 5 represents a hydroxyalkyl group.

First claim

The invention claimed is:

1. An acidic gas absorbing agent comprising:
an amino acid salt represented by general formula (1) or (2):

wherein COOMe represents a carboxylate group; Me represents an alkali metal; and R 1 and R 2 each independently represent an alkylene chain having 1 to 4 carbon atoms and a carboxylate group and/or an alkyl group having 1 to 4 carbon atoms may be bonded to any of the carbon atoms in the alkylene chain, provided that the total number of carbon atoms in the alkylene chains indicated by R 1 and R 2 is 1 to 5; and
an amine compound represented by general formula (3):

wherein R 3 represents a substituted or unsubstituted cycloalkyl group having 3 to 8 carbon atoms; R 4 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and R 5 represents a hydroxyalkyl group.

2. The acidic gas absorbing agent according to claim 1 , wherein, in the amino acid salt represented by general formula (1), R 1 represents an alkylene chain having 3 carbon atoms.

3. The acidic gas absorbing agent according to claim 1 , wherein, in the amine compound represented by general formula (3), R 3 represents a cycloalkyl group having 5 or 6 carbon atoms.

4. The acidic gas absorbing agent according to claim 1 , wherein, in the amine compound represented by general formula (3), R 5 represents a 2-hydroxyethyl group .

5. The acidic gas absorbing agent according to claim 1 , wherein the content of the amino acid salt represented by general formula (1) or (2) and the content of the amine compound represented by general formula (3) are 0.1 to 20% by mass and 10 to 60% by mass, respectively.

6. A method for removing an acidic gas, the method comprising bringing a gas containing an acidic gas into contact with an acidic gas absorbing agent according to claim 1 to remove the acidic gas from the gas containing the acidic gas.

7. An acidic gas removing apparatus comprising:
an absorber that brings a gas containing an acidic gas into contact with an acidic gas absorbing agent to absorb the acidic gas in the acidic gas absorbing agent, thereby removing the acidic gas from the gas containing the acidic gas; and
a regenerator that desorbs the acidic gas from the acidic gas absorbing agent with the acidic gas absorbed therein to regenerate the acidic gas absorbing agent,
the acidic gas absorbing agent regenerated in the regenerator being reutilized in the absorber, wherein
an acidic gas absorbing agent according to claim 1 is used as the acidic gas absorbing agent.

Assignees

• Toshiba Kk

Inventors

• Murai Shinji
• Kato Yasuhiro
• Muramatsu Takehiko
• Saito Satoshi

Classifications

• B01D2257/308

  Carbonoxysulfide COS · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• B01D2252/20494

  Amino acids, their salts or derivatives · CPC title

• B01D53/1475

  Removing carbon dioxide · CPC title

• B01D2252/20426

  Secondary amines · CPC title