Enriched acid gas for sulfur recovery

A system of enriching acid gas for feeding a sulfur recovery unit, the system comprising:

• a contactor configured to separate an acid gas stream into a carbon dioxide rich stream and a purified acid gas stream, the acid gas stream comprising hydrogen sulfide (H2S), carbon dioxide (CO2), and hydrocarbons;
• a regenerator in fluid communication with the contactor such that the regenerator is configured to separate the purified acid gas stream to create a hydrogen sulfide rich stream and a hydrogen sulfide lean stream, the hydrogen sulfide rich stream having a concentration of hydrogen sulfide;
• and
• a recycle stream conduit fluidly coupled between the regenerator to the contactor and configured to supply at least a portion of the hydrogen sulfide rich stream from the regenerator to the contactor.

A system of enriching acid gas for feeding a sulfur recovery unit, the system comprising:

• a contactor, the contactor configured to separate an acid gas stream into a carbon dioxide rich stream and a purified acid gas stream, the acid gas stream comprising hydrogen sulfide (H2S), carbon dioxide (CO2), and hydrocarbons;
• a regenerator in fluid communication with the contactor, the regenerator configured to separate the purified acid gas stream to create a hydrogen sulfide rich stream and a hydrogen sulfide lean stream, the hydrogen sulfide rich stream having a concentration of hydrogen sulfide;
• and
• a controller configured to operate a recycle valve, wherein the recycle valve, when in an open state, is configured to separate at least a portion of the hydrogen sulfide rich stream exiting from the regenerator and to feed the portion of the hydrogen sulfide rich stream to the contactor, and wherein the recycle valve, when in an closed state, is configured to purge an entire hydrogen sulfide rich stream exiting from the regenerator.