Double loop liquid-liquid H.sub.2 S removal process
First Claim
1. A process for removal of hydrogen sulfide from a hydrogen sulfide-containing gaseous stream comprising:
- contacting said hydrogen sulfide-containing gaseous stream with a nonaqueous phase sorbent comprising at least one substantially water-insoluble organic solvent under conditions suitable for forming a hydrogen sulfide-laden sorbent and a clean gaseous stream, thereby forming said hydrogen sulfide-laden sorbent and a clean gaseous stream;
mixing said hydrogen sulfide-laden sorbent with an oxidized aqueous phase redox couple under conditions suitable for forming a mixture comprising sulfur, a regenerated said nonaqueous phase sorbent, and a reduced aqueous phase redox couple, thereby forming said mixture;
separating said sulfur from said mixture; and
extracting said reduced aqueous phase redox couple from said mixture and regenerating said oxidized aqueous phase redox couple.
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Abstract
A process and system for removal of hydrogen sulfide from a hydrogen sulfide-containing gaseous stream comprising contacting the hydrogen sulfide-containing gaseous stream with a nonaqueous phase sorbent under conditions suitable for forming a hydrogen sulfide-laden sorbent and a clean gaseous stream. The hydrogen sulfide-laden sorbent is mixed with an aqueous phase redox coupled, regenerating the nonaqueous phase sorbent, reducing the aqueous phase redox couple, and forming sulfur. The sulfur is separated from the mixture. The reduced aqueous phase redox couple is extracted from the mixture and regenerated with an oxidizing agent or electrochemical cell.
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Citations
15 Claims
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1. A process for removal of hydrogen sulfide from a hydrogen sulfide-containing gaseous stream comprising:
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contacting said hydrogen sulfide-containing gaseous stream with a nonaqueous phase sorbent comprising at least one substantially water-insoluble organic solvent under conditions suitable for forming a hydrogen sulfide-laden sorbent and a clean gaseous stream, thereby forming said hydrogen sulfide-laden sorbent and a clean gaseous stream; mixing said hydrogen sulfide-laden sorbent with an oxidized aqueous phase redox couple under conditions suitable for forming a mixture comprising sulfur, a regenerated said nonaqueous phase sorbent, and a reduced aqueous phase redox couple, thereby forming said mixture; separating said sulfur from said mixture; and extracting said reduced aqueous phase redox couple from said mixture and regenerating said oxidized aqueous phase redox couple. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A process for removal of hydrogen sulfide from a hydrogen sulfide-containing gaseous stream comprising the steps of:
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absorbing said hydrogen sulfide in said hydrogen sulfide-containing gaseous stream with a nonaqueous phase sorbent comprising at least one substantially water-insoluble organic solvent thereby forming a hydrogen sulfide-laden sorbent; mixing said hydrogen sulfide-laden sorbent with an oxidized aqueous phase redox couple thereby forming a mixture comprising sulfur, a regenerated said nonaqueous phase sorbent, and a reduced aqueous phase regenerant; separating said sulfur from said mixture; and extracting said reduced aqueous phase regenerant from said mixture and oxidizing said reduced aqueous phase regenerant thereby regenerating said oxidized aqueous phase redox couple. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification