Systems and methods for sub-dewpoint sulfur recovery

Abstract

Systems and methods for sub-dewpoint sulfur recovery using a separation device and / or an interstage heater to improve the performance of a single (catalytic) step sulfur recovery system without the need for a thermal step or an additional catalyst. The sulfur bearing compounds are removed at a higher pressure than traditional Claus operating pressures prior to additional feed gas processing. The main reaction in the Claus-type process used to convert the sulfur species to elemental sulfur is: 2H2S + SO2 3S + 2H2O where SO2 may be used as the oxidant for the Claus catalytic reaction.

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