System for the removal of heat stable amine salts from an amine absorbent

Patent metadata

Field	Value
Publication number	US-10456749-B2
Application number	US-201615253243-A
Country	US
Kind code	B2
Filing date	Aug 31, 2016
Priority date	Mar 18, 2011
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A system for the removal of heat stable amine salts from an amine absorbent used in a carbon dioxide (CO2) capture process.

First claim

The invention claimed is:

1. A carbon dioxide (CO 2 ) capture system using an amine absorbent for absorption of CO 2 from a gas stream, the CO 2 capture system comprising a subsystem for removal of heat stable amine salts from a slipstream comprising the amine absorbent, the subsystem comprising:
a residual CO 2 removal unit in liquid connection with, and configured to receive, the slipstream containing heat stable amine salts from a CO 2 -lean amine absorbent stream of the CO 2 capture system, and operative for separating residual CO 2 from the CO 2 -lean amine absorbent stream; and
an amine reclaimer in liquid connection with, and configured to receive, the slipstream containing heat stable amine salts and having a reduced concentration of CO 2 from the residual CO 2 removal unit, operative for separating heat stable amine salts from the slipstream, and configured to return the slipstream separated from heat stable amine salts to the CO 2 -lean amine absorbent stream.

2. The CO 2 capture system according to claim 1 , wherein the amine reclaimer comprises an electrodialysis unit or an ion exchange unit.

3. The CO 2 capture system according to claim 1 , wherein the subsystem further comprises an amine absorbent cooler operationally arranged between the residual CO 2 removal unit and the reclaimer and operative for cooling the slipstream from the residual CO 2 removal unit before the slipstream enters the reclaimer.

4. The CO 2 capture system according to claim 1 , wherein the subsystem further comprises an indirect heat exchanger operative for subjecting the slipstream from the residual CO 2 removal unit to indirect heat exchange with the slipstream coming from the reclaimer.

5. The CO 2 capture system according to claim 1 , wherein the residual CO 2 removal unit comprises a stripper and/or a flash drum.

6. The CO 2 capture system according to claim 5 , wherein the residual CO 2 removal unit comprises the stripper.

7. The CO 2 capture system according to claim 5 , wherein the residual CO 2 removal unit comprises the flash drum.

8. The CO 2 capture system according to claim 5 , wherein the residual CO 2 removal unit comprises the stripper and the flash drum arranged in series.

9. The CO 2 capture system according to claim 1 further comprising:
a CO 2 absorber operative for scrubbing the gas stream comprising CO 2 with the amine absorbent such that a CO 2 -rich amine absorbent stream is formed; and
a regenerator operative for regenerating the CO 2 -rich amine absorbent stream by heating the CO 2 -rich amine absorbent stream to separate CO 2 from the amine absorbent, thereby forming the CO 2 -lean amine absorbent stream.

10. The CO 2 capture system according to claim 9 , wherein the slipstream is taken from the CO 2 -lean amine absorbent stream from the regenerator.

11. The CO 2 capture system according to claim 9 further comprising an amine absorbent heat exchanger between the CO 2 absorber and the regenerator.

12. The CO 2 capture system according to claim 11 , wherein the slipstream is taken from the CO 2 -lean amine absorbent stream from the amine absorbent heat exchanger.

13. The CO 2 capture system according to claim 11 , wherein the slipstream is taken from between the regenerator and the amine absorbent heat exchanger.

14. The CO 2 capture system according to claim 11 , wherein the slipstream is taken from between the amine absorbent heat exchanger and the CO 2 absorber.

15. The CO 2 capture system according to claim 11 , wherein the amine reclaimer comprises an electrodialysis unit.

16. The CO 2 capture system according to claim 11 , wherein the amine reclaimer comprises an ion exchange unit.

Assignees

• General Electric Technology Gmbh
• Dow Global Technologies Llc

Inventors

• Handagama Nareshkumar B
• Baburao Barath
• Vitse Frederic
• Bedell Stephen A
• Leister Jonathan W
• Dugas Ross

Classifications

• C07C209/84

  Purification · CPC title

• B01D2257/504

  Carbon dioxide · CPC title

• B01D2252/204

  Amines · CPC title

• B01J47/00

  Ion-exchange processes in general; Apparatus therefor (ion-exchange chromatography processes or apparatus B01D15/08) · CPC title

• B01D53/1475

  Removing carbon dioxide · CPC title