Systems and methods for selectively removing hydrogen sulfide from a feed gas stream

A selective hydrogen sulfide removal system, comprising:

• an absorber-heat exchanger (ABHEX) assembly configured to exchange thermal energy between a mixed stream and a thermal management fluid stream, wherein the ABHEX assembly:
• (i) defines a mixed stream volume configured to contain the mixed stream;
• (ii) defines a thermal management fluid stream volume configured to contain the thermal management fluid stream;
• and
• (iii) includes an isolation structure configured to maintain fluid separation between the mixed stream and the thermal management fluid stream and to facilitate thermal communication between the mixed stream and the thermal management fluid stream;
• a feed gas supply conduit configured to provide a feed gas stream, which includes hydrogen sulfide, carbon dioxide, and hydrocarbon gas, to the mixed stream volume;
• a lean solvent supply conduit configured to provide a lean solvent stream, which includes a hydrogen sulfide-absorbing solvent, to the mixed stream volume;
• a product gas discharge conduit configured to discharge a product gas stream, which includes purified hydrocarbon gas and carbon dioxide from the feed gas stream, from the mixed stream volume;
• a rich solvent discharge conduit configured to discharge a rich solvent stream, which includes a substantial portion of the hydrogen sulfide and the hydrogen sulfide-absorbing solvent, from the mixed stream volume;
• a thermal management fluid supply conduit configured to provide the thermal management fluid stream to the thermal management fluid stream volume;
• and
• a thermal management fluid discharge conduit configured to discharge the thermal management fluid stream from the thermal management fluid stream volume;
• wherein the ABHEX assembly includes a shell and tube heat exchanger that defines a shell side and a tube side, wherein the shell side defines the thermal management fluid stream volume and the tube side defines the mixed stream volume;
• and
• wherein the ABHEX assembly is configured to:
• (i) mix the feed gas stream and the lean solvent stream, within the mixed stream volume, to facilitate selective absorption of hydrogen sulfide by the lean solvent stream and to generate the mixed stream;
• (ii) separate the mixed stream into the product gas stream and the rich solvent stream;
• and
• (iii) cool the mixed stream, via heat transfer to the thermal management fluid stream, to absorb thermal energy generated upon mixing of the feed gas stream and the lean solvent stream.