Configurations and methods for processing high pressure acid gases with zero emissions

An acid gas removal plant, comprising:

• a physical solvent absorption unit configured to receive a feed gas comprising H2S and CO2 and a lean physical solvent to produce a treated gas and a rich physical solvent;
• an amine absorption unit configured to receive the treated gas and a lean amine stream and to produce a pipeline gas;
• multi-stage flash regeneration separators configured to receive a rich physical solvent from the physical solvent absorption unit and to produce the lean physical solvent,
• wherein the multi-stage flash regeneration separators comprise a first separator that is configured to produce a first flashed gas as a byproduct of regenerating a first semi-lean physical solvent from the rich physical solvent;
• and
• an amine unit configured to receive a semi-rich amine stream from the amine absorption unit to remove the H2S and CO2 from a flashed gas from the multi-stage flash regeneration separators to produce a fuel gas and a rich amine stream,
• wherein the amine unit comprises a fuel gas scrubber that is configured to (i) receive the first flashed gas and (ii) use a second portion of the lean amine to scrub the first flashed gas to produce a fuel gas and a rich amine.

An acid gas processing plant, comprising:

• an absorption unit configured to (i) receive a feed gas comprising H2S and CO2 and (ii) use a lean physical solvent to absorb a portion of H2S and CO2 within the feed gas to produce a treated gas and a rich physical solvent;
• an amine absorber coupled to the absorption unit and configured to (i) receive the treated gas from the absorption unit and (ii) use a first portion of a lean amine to absorb a portion of H2S and CO2 within the treated gas to produce a pipeline gas and a semi-lean amine;
• a physical solvent regeneration unit coupled to the absorption unit and configured to (i) receive the rich physical solvent from the absorption unit and (ii) regenerate the lean physical solvent from the rich physical solvent for feeding into the absorption unit,
• wherein the physical solvent regeneration unit comprises (i) a first separator that is configured to produce a first flashed gas as a byproduct of regenerating a first semi-lean physical solvent from the rich physical solvent, and (ii) a second separator that is configured to produce a second flashed gas as a byproduct of regenerating a second semi-lean physical solvent from the first semi-lean physical solvent;
• and
• an amine regeneration unit coupled to the amine absorber and configured to (i) receive the semi-lean amine from the amine absorber and (ii) regenerate the lean amine from the semi-lean amine for feeding into the amine absorber,
• wherein the amine regeneration unit comprises a second amine absorber that is configured to (i) receive the second flashed gas from the second separator and (ii) use a third portion of the lean amine to produce a CO2 rich stream and a rich amine.