Continuously stirred tank reactor absorber and flash tank stripper system

Patent metadata

Field	Value
Publication number	US-9545597-B2
Application number	US-201114361821-A
Country	US
Kind code	B2
Filing date	Dec 1, 2011
Priority date	Dec 1, 2011
Publication date	Jan 17, 2017
Grant date	Jan 17, 2017

Abstract

The invention relates to a process for separation or purification of gaseous streams by removal of acid gases using a liquid amine solution. The process involves the steps of —contacting the gaseous stream with liquid lean amine solution in at least one continuous flow stirred-tank reactor ( 10; 10 a, 10 b; 10 c ); —removing a sweetened gaseous flow from said continuous flow stirred-tank reactor ( 10 ); —removing rich amine from said continuous flow stirred-tank reactor ( 10; 10 a, 10 b; 10 c ) for regeneration; —passing rich amine solution through at least one flash tank stripper 20; 20 a, 20 b; 20 c ; —removing acid gases and vapor from said flash tank stripper 20; 20 a, 20 b; 20 c ; —removing lean amine from said flash tank stripper for recirculation to said continuous flow stirred-tank reactor ( 10; 10 a, 10 b; 10 c ).

First claim

The invention claimed is:

1. A process for separation or purification of gaseous streams by removal of acid gases using a liquid amine solution, the process comprising the steps of:
contacting the gaseous stream with liquid lean amine solution in at least one continuous flow stirred-tank reactor;
removing a sweetened gaseous flow from said continuous flow stirred-tank reactor;
removing rich amine solution from said continuous flow stirred-tank reactor for regeneration;
passing rich amine solution through at least one flash tank stripper;
removing acid gases and vapor from said flash tank stripper; and
removing lean amine solution from said flash tank stripper for recirculation to said continuous flow stirred-tank reactor;

wherein the gaseous stream is contacted with liquid lean amine solution in a plug flow reactor downstream of said continuous flow stirred-tank reactor.

2. The process according to claim 1 , wherein the gaseous stream is contacted with liquid lean amine solution in multiple continuous flow stirred-tank reactors arranged in series.

3. The process according to claim 1 , wherein the gaseous stream is contacted with liquid lean amine solution in at least one continuous flow stirred-tank reactor and a column absorber arranged in series.

4. The process according to claim 1 , wherein the gaseous stream is contacted with liquid lean amine solution in multiple continuous flow stirred-tank reactors arranged in parallel.

5. The process according to claim 1 , wherein the gaseous stream is contacted with liquid lean amine solution by supplying the gaseous stream at the bottom of the continuous flow stirred-tank reactor and removing said gaseous stream at the top of said reactor.

6. The process according to claim 1 , wherein rich amine solution is passed through two or more flash tank strippers arranged in series.

7. The process according to claim 1 , wherein rich amine solution is passed through two or more flash tank strippers arranged in parallel.

8. The process according to claim 1 , wherein rich amine solution is passed through at least one flash tank stripper and a column stripper arranged in series.

9. The process according to claim 1 , further comprising passing acid gases and vapor from said flash tank stripper through a condenser and removing lean amine and condensate for recirculation.

10. The process according to claim 1 , further comprising using an amine solution including one or more of monoethanol amine (MEA), diethanol amine (DEA), or methyl diethanol amine (MDEA).

11. The process according to claim 1 , wherein the process is performed to remove CO 2 and/or H 2 S from the gaseous stream.

12. The process according to claim 1 , wherein the process is performed at a predetermined pressure dependent on a supply pressure of the gaseous stream.

13. The process according to claim 12 , wherein the process is performed at a gaseous stream supply pressure of 60-70 bar.

Assignees

• Svendsen John Arild
• Pedersen Steinar
• Fostås Berit F
• Statoil Petroleum As

Inventors

• Svendsen John Arild
• Pedersen Steinar
• Fostås Berit F

Classifications

• B01D53/1425 Primary

  Regeneration of liquid absorbents · CPC title

• B01D2252/20431

  Tertiary amines · CPC title

• B01D53/1493 Primary

  Selection of liquid materials for use as absorbents · CPC title

• C10K1/004

  Sulfur containing contaminants, e.g. hydrogen sulfide · CPC title

• C10K1/143

  containing amino groups · CPC title