Promoter enhanced chilled ammonia based system and method for removal of CO
View Patent ↗A chilled ammonia based CO 2 capture system and method is provided. A promoter is used to help accelerate certain capture reactions that occur substantially coincident to and/or as a result of contacting a chilled ammonia based ionic solution with a gas stream that contains CO 2 .
1. A method of absorbing CO 2 from a flue gas, the method comprising:
contacting a flue gas stream containing CO 2 with a lean absorbent solution including an ammonia containing ionic solution or slurry and a promoter, the promoter including an amine effective to enhance the formation of ammonium bicarbonate within the lean absorbent solution, thereby producing a rich absorbent solution; and
regenerating the rich absorbent solution to release the CO 2 from the rich absorbent solution, thereby producing the lean absorbent solution.
2. The method of claim 1 , wherein the promoter includes piperazine.
3. The method of claim 2 , wherein the promoter includes 0.2-2.0 molar piperazine.
4. The method of claim 3 , wherein the promoter includes 0.4-1.0 molar piperazine.
5. A method of absorbing CO 2 from a flue gas, the method comprising:
contacting a flue gas stream containing CO 2 with a lean absorbent solution including an ammonia containing ionic solution or slurry and a promoter, the promoter including an enzyme effective to enhance the formation of ammonium bicarbonate within the lean absorbent solution, thereby producing a rich absorbent solution; and
regenerating the rich absorbent solution to release the CO 2 from the rich absorbent solution, thereby producing the lean absorbent solution.