Patent ID: 8784761

Claim:
Method for removing CO 2 from a flue gas stream containing CO 2 , the method comprising the steps of: arranging in a single absorber vessel a) in a cycle, contacting a flow of a first ionic solution comprising NH 3 with a flue gas stream to remove a first portion of CO 2 from the flue gas stream to produce a used first ionic solution, b) collecting the used first ionic solution in a first sump vessel to obtain the first ionic solution, said first sump vessel defined by a first division of a sump of the single absorber vessel, and c) recycling the first ionic solution from said first sump vessel back to flue gas stream to complete the cycle and remove another first portion of CO 2 from the flue gas stream, and d) in a cycle, contacting a flow of a second ionic solution comprising NH 3 with the flue gas stream to remove a second portion of CO 2 from the flue gas stream to produce a used second ionic solution, e) collecting the used second ionic solution in a second sump vessel to obtain the second ionic solution, said second sump vessel defined by a second division of a sump of the single absorber vessel, and f) recycling the second ionic solution from said second sump vessel back to flue gas stream to complete the cycle and remove another second portion of CO 2 from the flue gas stream.