Water removal in a redox process
This patent describes a process for the selective removal of hydrogen sulfide from a gas stream. It comprises treating the gas stream with an aqueous polyvalent metal ion or polyvalent metal chelate redox solution containing a catalytically effective amount of polyvalent metal ion or chelate, and optionally containing a ligand degradation inhibitor recovering a sweetened gas stream; removing sulfur from the solution; regenerating the solution with an excess of an oxygen containing as under oxidizing conditions in a regeneration zone until substantially all of the polyvalent metal is in its higher valence state; in a separate zone from the regeneration, contacting the regenerated redox solution containing water in excess of that required to maintain a catalytically effective concentration of polyvalent metal ion or chelate in solution, with an inert gas in a manner to provide for the substantial saturation of the inert gas with excess water from the regenerated redox solution without substantial undesirable contamination of or oxidation of the metal or ligand in the regenerated redox solution; and recycling the regenerated redox solution having a polyvalent metal ion or chelate concentration substantially the same as the feed solution to the first step.
- Assignee:
- Shell Oil Co., Houston, TX
- Patent Number(s):
- US 4853192
- Application Number:
- PPN: US 7-282898A
- OSTI ID:
- 5403276
- Country of Publication:
- United States
- Language:
- English
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Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
CATALYSTS
CHALCOGENIDES
CHELATES
CHEMICAL REACTIONS
COMPLEXES
CONTROL
DESULFURIZATION
ELEMENTS
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
MANAGEMENT
METALS
POLLUTION CONTROL
PROCESSING
REDOX PROCESS
REMOVAL
REPROCESSING
SEPARATION PROCESSES
SULFIDES
SULFUR COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES