Acid gas absorbent, acid gas removal device, and acid gas removal method

Patent metadata

Field	Value
Publication number	US-9724642-B2
Application number	US-201414555787-A
Country	US
Kind code	B2
Filing date	Nov 28, 2014
Priority date	Dec 3, 2013
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

An acid gas absorbent includes at least one kind of secondary amine compound represented by formula (1):

where R 1 is a cyclopentyl group or a cyclohexyl group which may be substituted by a substituted or non-substituted alkyl group having 1 to 3 carbon atoms, R 2 and R 3 each indicate an alkylene group having 2 to 4 carbon atoms, and R 2 and R 3 may each be the same or different, and be a straight chain or have a side chain.

First claim

What is claimed is:

1. An acid gas absorbent comprising 45 mass % to 55 mass % of at least one secondary amine compound represented by general formula (1),

where R 1 indicates a cyclopentyl group which may be substituted by a substituted or non-substituted alkyl group having 1 to 3 carbon atoms, R 2 and R 3 , which may be the same or different, each indicate an alkylene group having 2 to 4 carbon atoms and are a straight chain or have a side chain.

2. The acid gas absorbent according to claim 1 ,
wherein, in the secondary amine compound represented by the general formula (1), R 2 and R 3 each independently indicate an alkylene group having 2 or 3 carbon atoms.

3. The acid gas absorbent according to claim 1 , further comprising water.

4. The acid gas absorbent according to claim 1 , comprising water and 45 mass % to 55 mass % of 2-[2-(cyclopentylamino)ethoxy]ethanol.

5. The acid gas absorbent according to claim 1 , comprising water and 45 mass % to 55 mass % of 3-[2-(cyclopentylamino)ethoxy]-1-propanol.

6. The acid gas absorbent according to claim 1 , comprising water and 45 mass % to 55 mass % of 4-[2-(cyclopentylamino)ethoxy]-1-butanol.

7. The acid gas absorbent according to claim 1 , wherein the at least one secondary amine compound represented by general formula (1) is selected from 2-[2-(cyclopentylamino)ethoxy]ethanol, 2-[3-(cyclopentylamino)propoxy]ethanol, 2-[4-(cyclopentylamino)butoxy]ethanol, 3-[2-(cyclopentylamino)ethoxy]-1-propanol, 3-[3-(cyclopentylamino)propoxy]-1-propanol, 3-[4-(cyclopentylamino)butoxy]-1-propanol, 1-[2-(cyclopentylamino)ethoxy]-2-propanol, 1-[3-(cyclopentylamino)propoxy]-2-propanol, 1-[4-(cyclopentylamino)butoxy]-2-propanol, 4-[2-(cyclopentylamino)ethoxy]-1-butanol, 4-[3-(cyclopentylamino)propoxy]-1-butanol, and 4-[4-(cyclopentylamino)butoxy]-1-butanol.

8. The acid gas absorbent according to claim 1 , further comprising 1 mass % to 20 mass % of an alkanolamine and/or a heterocyclic amine compound

9. The acid gas absorbent according to claim 8 , comprising an alkanolamine which is at least one selected from the group consisting of 2-(isopropylamino)ethanol, 2-(ethylamino)ethanol, and 2-amino-2-methyl-1-propanol.

10. The acid gas absorbent according to claim 8 , comprising at least one kind of piperazine compound.

11. The acid gas absorbent according to claim 10 ,
wherein the piperazine compound is at least one selected from the group consisting of piperazine, 2-methylpiperazine, 2,5-dimethylpiperazine, and 2,6-dimethylpiperazine.

12. The acid gas absorbent according to claim 8 , wherein the alkanolamine and/or heterocyclic amine compound are selected from monoethanolamine, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, methylaminoethanol, diethanolamine, bis(2-hydroxy-1-methylethyl)amine, methyldiethanolamine, dimethylethanolamine, diethylethanolamine, triethanolamine, dimethylamino-1-methylethanol, 2-methylaminoethanol, 2-(ethylamino)ethanol, 2-propylaminoethanol, n-butylaminoethanol, 2-(isopropylamino)ethanol, 3-ethylaminopropanol, azetidine, 1-methylazetidine, 1-ethylazetidine, 2-methylazetidine, 2-azetidylmethanol, 2-(2-aminoethyl)azetidine, pyrrolidine, 1-methylpyrrolidine, 2-methylpyrrolidine, 2-butylpyrrolidine, 2-pyrrolidylmethanol, 2-(2-aminoethyl)pyrrolidine, piperidine, 1-methylpiperidine, 2-ethylpiperidine, 3-propylpiperidine, 4-ethylpiperidine, 2-piperidylmethanol, 3-piperidylethanol, 2-(2-aminoethyl)pyrrolidine, hexahydro-1H-azepine, hexamethylenetetramine, piperazine, 2-methylpiperazine, 2,5-dimethyl piperazine, and 2,6-dimethylpiperazine.

13. An acid gas removal method comprising:
bringing gas containing acid gas into contact with the acid gas absorbent according to claim 1 to thereby remove the acid gas from the gas containing the acid gas.

14. The acid gas removal method according to claim 13 , wherein the acid gas is carbon dioxide.

Assignees

• Toshiba Kk

Inventors

• Murai Shinji
• Maezawa Yukishige
• Kato Yasuhiro
• Muramatsu Takehiko
• Hodotsuka Masatoshi
• Saito Satoshi

Classifications

• B01D2257/504

  Carbon dioxide · CPC title

• B01D2258/0283

  Flue gases · CPC title

• B01D53/1475

  Removing carbon dioxide · CPC title

• B01D2257/304

  Hydrogen sulfide · CPC title

• B01D2252/2023

  Glycols, diols or their derivatives · CPC title