System for recovering acid gases from a gas stream

A gas purification system, comprising:

• a first section comprising a first solvent path and a first gas path, wherein the first gas path is configured to flow a stripping gas to remove hydrogen sulfide (H2S) and carbon dioxide (CO2) from the first solvent path in a first vessel to produce a first gas mixture;
• a second section comprising a second solvent path, wherein the second solvent path is configured to flow a first solvent mixture from a flash vessel to a second vessel of the first section to remove H2from the first gas mixture and CO2from a second solvent mixture within the second vessel, the second solvent mixture comprises a solvent saturated in CO2 at a first pressure generated by the flash vessel, the second vessel is operated at a second pressure, and the first and second pressures are within approximately 20% of one another;
• and
• a third solvent path exiting the flash vessel, wherein the third solvent path diverges from the second solvent path at the flash vessel and is configured to recirculate solvent within the second section.

A gas purification system, comprising:

• an H2S absorption section, comprising:
• a hydrogen sulfide (H2S) concentrator;
• an H2S re-absorber;
• a first solvent path through the H2S concentrator;
• and
• a first gas path sequentially through the H2S concentrator and the H2S re-absorber, wherein the first gas path is configured to deliver a first gas mixture to the H2S re-absorber, and the first gas mixture comprises a stripping gas, carbon dioxide (CO2), and H2S;
• and
• a second solvent path configured to flow a first solvent mixture saturated in CO2 at a first pressure from a first flash vessel of a CO2 absorption section to the H2S re-absorber to remove H2S from the first gas mixture;
• and
• a third solvent path diverging from the second solvent path at the first flash vessel, wherein the third solvent path is configured to flow a second solvent mixture saturated in CO2at the first pressure from the first flash vessel to a second flash vessel of the CO2 absorption section.