Complex amine absorbent, and device and method for removing one or both of CO2 and H2S

Patent metadata

Field	Value
Publication number	US-10137407-B2
Application number	US-201314399107-A
Country	US
Kind code	B2
Filing date	Apr 25, 2013
Priority date	May 11, 2012
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

An absorbent is prepared by dissolving in water 1) monoethanolamine (MEA) and 2) a primary amine represented by the following formula (1) and having high steric hindrance. Releasability of CO 2 or H 2 S during regeneration of the absorbent is thereby improved, and the amount of water vapor used during regeneration of the absorbent in a facility for recovering CO 2 or H 2 S can be reduced.

R 1 to R 3 : H or a hydrocarbon group having 1 to 3 carbon atoms, at least one of R 1 to R 3 being a hydrocarbon.

First claim

The invention claimed is:

1. A complex amine absorbent for absorbing one or both of CO 2 and H 2 S in a gas, the complex amine absorbent comprising
1) monoethanolamine (MEA),
2) 2-amino-2-methyl-1-propanol, and
3) at least one selected from the group consisting of N,N′-dimethylethylenediamine, N,N′-diethylethylenediamine, and N,N′-dimethylpropanediamine.

2. The complex amine absorbent according to claim 1 ,
wherein the component 3) is N,N′-dimethylethylenediamine or N,N′-dimethylpropanediamine.

3. A device for removing one or both of CO 2 and H 2 S, the device comprising: an absorber for removing one or both of CO 2 and H 2 S by bringing a gas containing one or both of CO 2 and H 2 S in contact with the complex amine absorbent of claim 1 ; and a regenerator for regenerating a solution containing the one or both of CO 2 and H 2 S absorbed therein, the absorbent regenerated by removing the one or both of CO 2 and H 2 S in the regenerator being reused in the absorber.

4. A method of removing one or both of CO 2 and H 2 S, the method comprising: bringing a gas containing one or both of CO 2 and H 2 S in contact with the complex amine absorbent of claim 1 to remove the one or both of CO 2 and H 2 S; regenerating a solution containing one or both of CO 2 and H 2 S absorbed therein; and reusing, in an absorber, the absorbent regenerated by removing the one or both of CO 2 and H 2 S in a regenerator.

5. The method for removing one or both of CO 2 and H 2 S according to claim 4 ,
wherein an absolute pressure inside the regenerator is 130 to 200 kPa,
an absorption temperature in the absorber is 30 to 80° C., and
a regeneration temperature in the regenerator is 110° C. or higher.

Assignees

• Mitsubishi Heavy Ind Ltd
• Kansai Electric Power Co
• Mitsubishi Heavy Ind Eng Ltd

Inventors

• Tanaka Hiroshi
• Nagayasu Hiromitsu
• Hirata Takuya
• Oishi Tsuyoshi
• Kamijo Takashi

Classifications

• B01D2252/20405

  Monoamines · CPC title

• B01J20/22

  comprising organic material · CPC title

• B01D2252/20426

  Secondary amines · CPC title

• B01D2258/0283

  Flue gases · CPC title

• B01D53/1493

  Selection of liquid materials for use as absorbents · CPC title