Process to remove sulfur contaminants from hydrocarbon streams
View Patent ↗A process for removing sulfur compounds from hydrocarbon streams by contacting the hydrocarbon stream, especially a gasoline stream, with an adsorbent material. The adsorbent material is regenerated with hydrogen or a hydrogen/H 2 S mixture.
1. A process for removing organic sulfur and elemental sulfur moieties from a sulfur moiety-containing hydrocarbon stream, which process comprises:
contacting the sulfur moiety-containing hydrocarbon stream in the substantial absence of added hydrogen with an adsorbent material comprised of at least one Group VIII metal and at least one Group VI metal selected from the group consisting of Mo and W on a suitable refractory support material until the adsorbent material becomes substantially saturated;
regenerating the substantially saturated adsorbent material at hydrodesulfurization conditions in the presence of a flow of hydrogen-containing gas at effective pressures of about 60 to 500 psig and temperatures of about 200° C. to about 500° C. to result in the desulfurization, by conversion to hydrogen sulfide, of at least a portion of the adsorbed sulfur moieties from the adsorbent material.
2. The process of claim 1 wherein the hydrodesulfurization conditions include a pressure of from about 0 to about 2000 psig, and a temperature from about 100° C. to about 600° C.
3. The process of claim 1 wherein the hydrogen-containing gas is selected from substantially pure hydrogen and a mixture of hydrogen and hydrogen sulfide.
4. The process of claim 3 wherein the hydrogen-containing gas is substantially pure hydrogen.
5. The process of claim 1 wherein said sulfur moieties are organically bound sulfur compounds selected from the group consisting of aliphatic mercaptans, naphthenic mercaptans, aromatic mercaptans, sulfides, di-sulfides, polysulfides, thiophenes, their higher homologs, and their higher analogs.
6. The process of claim 1 wherein said adsorbent is a hydrotreating catalyst comprised of at least one Group VIII metal and at least one Group VI metal selected from the group consisting of Mo and W on an inorganic metal oxide support material.
7. The process of claim 6 wherein the Group VIII metal is selected from Co, Ni, and Fe.
8. The process of claim 6 wherein said hydrotreating catalyst further comprises a metal selected from the group consisting of Group IA metals, Group IIA metals, and Group IB metals.
9. The process of claim 1 wherein said sulfur moiety-containing hydrocarbon stream boils in the range of about 10° C. to about 600° C.
10. The process according to claim 9 wherein said sulfur moiety-containing hydrocarbon stream is a distillate stream boiling in the range of about 150° C. to about 600° C.
11. The process of claim 9 wherein said sulfur moiety-containing hydrocarbon stream is a naphtha stream boiling in the range of about 10° C. to about 230° C.
12. The process of claim 1 wherein the adsorbent is contained on a fixed bed arrangement.
13. The process of claim 1 wherein the hydrogen-containing gas is passed through said adsorbent on a once-through basis.
14. The process of claim 1 wherein the hydrogen-containing gas is recycled to the adsorbent bed.
15. The process of claim 9 wherein the desulfurized hydrocarbon stream product is condensed.