A method for desulfurizing natural gas includes contacting the natural gas with an adsorbent which preferentially adsorbs at least one of hydrogen sulfide, COS, sulfur odorants, or combinations thereof, at a selected temperature and pressure, thereby producing desulfurized natural gas and an at leas
A method for desulfurizing natural gas includes contacting the natural gas with an adsorbent which preferentially adsorbs at least one of hydrogen sulfide, COS, sulfur odorants, or combinations thereof, at a selected temperature and pressure, thereby producing desulfurized natural gas and an at least one of hydrogen sulfide/COS/sulfur odorant/combinations thereof-rich adsorbed component. The adsorbent includes a copper species adapted to form π-complexation bonds and direct metal-sulfur bonds with the at least one of hydrogen sulfide, COS, sulfur odorants, or combinations thereof, and wherein the preferential adsorption occurs by π-complexation and direct metal-sulfur bonding.
대표청구항▼
1. A method for desulfurizing natural gas hydrocarbons, the method comprising: contacting the natural gas with an adsorbent which preferentially adsorbs at least one of hydrogen sulfide, COS, sulfur odorants, or combinations thereof, at a selected temperature and pressure, thereby producing desulfur
1. A method for desulfurizing natural gas hydrocarbons, the method comprising: contacting the natural gas with an adsorbent which preferentially adsorbs at least one of hydrogen sulfide, COS, sulfur odorants, or combinations thereof, at a selected temperature and pressure, thereby producing desulfurized natural gas and a hydrogen sulfide, COS, sulfur odorant, or combinations thereof-rich adsorbed component, wherein the adsorbent comprises a Cu+ species adapted to form π-complexation and direct metal-sulfur bonds with the at least one of hydrogen sulfide, COS, sulfur odorants, or combinations thereof, and wherein the preferential adsorption occurs by π-complexation and direct metal-sulfur bonding. 2. The method of claim 1, wherein the natural gas is pipeline natural gas, and wherein the sorbent adsorbs hydrogen sulfide and sulfur odorants. 3. The method of claim 2, wherein the sulfur odorants are dimethyl sulfide. 4. The method of claim 1, wherein the adsorbent is activated by pretreatment at a temperature ranging between about 250° C. and about 600° C. and for a time ranging between about one hour and about 20 hours, followed by cooling. 5. The method of claim 4, wherein the adsorbent is activated in a reductive atmosphere. 6. The method of claim 1, further comprising pretreating the natural gas using a desiccant. 7. The method of claim 6, wherein the desiccant is selected from activated alumina, silica gel, activated carbon and combinations thereof. 8. The method of claim 1, further comprising pretreating the natural gas using a non-sulfur selective sorbent that removes hydrocarbons heavier than methane. 9. The method of claim 1, wherein the adsorbent further includes a zeolite or a mesoporous support. 10. The method of claim 1, wherein prior to contacting the natural gas with the adsorbent, the method further comprises pretreating the adsorbent, the pretreatment process comprising the steps of: activating the adsorbent at a temperature ranging from about 250° C. to about 600° C. in an inert or reducing atmosphere for an amount of time ranging between about one hour and about 20 hours; andthen cooling the adsorbent in an inert atmosphere. 11. The method of claim 1, wherein the selected temperature is ambient temperature and the selected pressure is ambient pressure. 12. The method of claim 1, wherein the adsorbed component comprises compounds of the formula: R—S—H; R—S—R; or Ar—S—Ar,wherein R represents an aliphatic ligand and Ar represents an aromatic ligand, and wherein the ligands are capable of not interfering with the formation of p-complexation by steric hinderance. 13. An intermediate complex of the formula: R—S(Cu)—H; R—S(Cu)—R; or Ar—S(Cu)—Ar, produced by the process of claim 1, wherein R represents an aliphatic ligand and Ar represents an aromatic ligand, wherein the ligands are capable of not interfering with the formation of p-complexation by steric hinderance, and wherein Cu+ is π-bonded to the sulfur containing compound. 14. The method of claim 1, further comprising regenerating the adsorbent by calcining the adsorbent. 15. The method of claim 1, wherein the adsorbent comprises Cu(I)Y or supported Cu+ compounds on high area surface substrates. 16. The method of claim 1, wherein the adsorbent comprises an ion-exchanged zeolite or mesoporous support. 17. The method of claim 1, wherein the natural gas is present in ambient air. 18. The method of claim 1, wherein the adsorbed component comprises compounds of the formula: R—S(Cu)—H; R—S(Cu)—R; or Ar—S(Cu)—Ar, wherein R represents an aliphatic ligand and Ar represents an aromatic ligand, wherein the ligands are capable of not interfering with the formation of p-complexation by steric hinderance, and wherein Cu+ is π-bonded to the sulfur containing compound.
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