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Gases
SweetSulf
SweetSulf™ is a redox process developed for high pressure natural gas applications. Its specific solid sulfur removal technology overcomes the foaming/plugging problems experienced with other types of redox processes. SweetSulf™ has been demonstrated on an industrial pilot plant operated with natural gas under 80 bar, at a Engie underground storage facility.
Process Scheme
Process Principle
- Reaction: Sour Gas is contacted with an aqueous redox solution which extracts the H2S and converts it into solid elemental sulfur.
- Gas separation: Treated gas, free of H2S, is separated from the redox solution.
- Solid separation: Solid sulfur is filtered under pressure on a cartridge filter which can be regenerated on stream.
- Re-Oxidation The redox solution is depressurized and re-oxidized by contact with air.
Performances
- SweetSulf™ process has been proven for high pressure operation with 6 760 hours of industrial pilot operation
- SweetSulf™ can treat any composition of gas in the range of H₂S concentration below 5 000 ppm
- H₂S outlet levels can go below 1 ppm
- Economic application range 10 – 1 000 ppm H₂S in feed
- CO₂ partial pressure limited to # 4 bar
Key Benefits
- Selective H2S removal with direct conversion into solid elemental sulfur
- gas sweetening may be done at any pressure
- Ambient temperature operation
- High Pressure Filtration: no foaming, no risk of plugging
- Flexibility, easy operation
- Minimum solvent flowrates and pumping costs
- CAPEX and total costs can be 20 – 50% lower than for conventional processes for feed H2S levels between 10 and 1 000 ppm)
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