Consider different alternatives for enriching lean acid gases
New developments improve operation of Claus sulfur recovery units
Lean acid-gas enrichment processes can be used to upgrade low-quality offgas from treating units to higher-quality Claus plant feed or to smaller volume streams that are suitable for reinjection. The process objective is minimizing hydrogen sulfide (H2S) leaks into the systems vent gas, thus producing a gas enriched in H2S to the greatest extent possible.
Designing and operating acid-gas enrichment plants are highly sensitive for a number of parameters, including lean-solvent temperature (a serious constraint in the Middle East). Other parameters are feed gas, including H2S/carbon dioxide (CO2), choice of tower internals type, number of contact trays, and solvent selection.
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