Once through CO2 absorber with integrated ammonia slip mitigation and intercooling

A process of removing CO2 from a CO2-containing gas stream, the process comprising:

• contacting, in a first absorber stage, a CO2-containing gas stream with a solution mixture to generate a partially cleaned gas stream;
• contacting, in a second absorber stage, the partially cleaned gas stream with a CO2-lean solution to generate a further cleaned gas stream that contains ammonia and a CO2-partially-enriched solution;
• dividing the CO2-partially-enriched solution into a first portion and a second portion;
• removing the first portion of the CO2-partially-enriched solution from the second absorber stage;
• chilling the removed CO2-partially-enriched solution;
• contacting, in a third absorber stage, the chilled CO2-partially-enriched solution with the further cleaned gas stream that contains ammonia to generate a treated gas stream and a CO2-partially-enriched-solution containing recovered ammonia;
• and combining the solution containing the recovered ammonia removed from the third absorber stage with the second portion of the CO2-partially-enriched solution before distribution to a first gas-liquid contacting device to form a mixed solution at a reduced temperature, thereby avoiding a separate intercooling equipment, forming the solution mixture used in the first absorber stage, wherein the combining comprises delivering the solution containing the recovered ammonia drawn from the third absorber stage to a second liquid collector in the second absorber stage or to the first absorber stage at a height location that is above the first gas-liquid contacting device in the first absorber stage to allow the solution containing the recovered ammonia and the second portion of the CO2-partially-enriched solution to be mixed above or in the first gas-liquid contacting device.