Two-stage absorption for acid gas and mercaptan removal

A system for processing a gas stream comprising:

• an acid gas removal unit comprising:
• a first absorber unit configured to receive a feed gas stream containing organic sulfur species and acid gas components, remove at least a portion of the organic sulfur species and acid gas components using a semi-rich solvent at a first pressure, produce a semi-treated gas stream, and produce a rich solvent stream;
• a compressor unit configured to compress the semi-treated gas stream from the first absorber at the first pressure, and produce a compressed semi-treated gas stream at a second pressure, wherein the second pressure is higher than the first pressure;
• a second absorber unit configured to receive the compressed semi-treated gas stream, remove at least a portion of any organic sulfur species and acid gas components present in the compressed semi-treated gas stream using a lean solvent, produce the semi-rich solvent stream, and produce a treated gas stream;
• a pressure reduction device configured to receive the semi-rich solvent stream from the second absorber, flash the semi-rich solvent stream to provide a low-pressure semi-rich solvent stream, and provide the low-pressure semi-rich solvent stream to the first absorber;
• and
• a regeneration unit configured to receive the rich solvent stream, remove acid gas components from the rich solvent stream, and produce the lean solvent stream.