Desulfurization with improved sorbent regeneration
AssigneeConocoPhillips Company
InventorsJason J. Gislason, Ronald E. Brown, Robert W. Morton, Glenn W. Dodwell
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Abstract
While contacting under regeneration conditions an oxygen-containing stream with a sorbent comprising a promoter metal and zinc sulfide which has been sulfurized by contact with sulfur-containing hydrocarbons such as cracked-gasolines and diesel fuel, the oxygen partial pressure is controlled in a range of 0.5 to 2.0 psig to minimize sulfation of the sorbent.
Claims33
A process for minimizing sulfation of a sorbent while regenerating said sorbent, said process comprising the steps of:
- (a) charging an oxygen-containing regeneration stream to said regeneration zone;
- (b) charging a sulfurized sorbent comprising a promoter metal and zinc sulfide to said regeneration zone;
- and
- (c) contacting said sulfurized sorbent with said regeneration stream in said regeneration zone under regeneration conditions sufficient to maintain an average oxygen partial pressure in a range of about 0.5 psig to less than about 2.0 psig in said regeneration zone thereby minimizing sulfation of said sorbent while regenerating the sorbent.
A process for minimizing sulfation of a sorbent while regenerating and activating said sorbent, said process comprising the steps of:
- (a) contacting a sulfurized sorbent comprising a promoter metal and zinc sulfide with an oxygen-containing stream in a regeneration zone under regeneration conditions sufficient to maintain an average oxygen partial pressure in said regeneration zone in a range of about 0.5 psig to less than about 2.0 psig, thereby providing a desulfurized sorbent;
- and
- (b) contacting said desulfurized sorbent with a reducing stream in an activation zone under activation conditions including a temperature which is more than about 300° F. and less than about 1000° F., thereby providing an activated sorbent.
A desulfurization process comprising the steps of:
- (a) contacting a sulfurized sorbent comprising a promoter metal and zinc sulfide with an oxygen-containing stream in a regeneration zone under regeneration conditions sufficient to minimize sulfation of said sorbent while converting at least a portion of said zinc sulfide to zinc oxide, thereby providing a desulfurized sorbent, said regeneration conditions including an average oxygen partial pressure in a range of about 0.5 psig to less than about 2.0 psig;
- (b) contacting at least a portion of said desulfurized sorbent with a hydrogen-containing stream in an activation zone under activation conditions sufficient to reduce the valence of said promoter metal, thereby providing an activated sorbent;
- and
- (c) contacting at least a portion of said activated sorbent with a sulfur-containing fluid comprising at least about 50 ppmw sulfur in a desulfurization zone under desulfurization conditions sufficient to provide a desulfurized fluid comprising less than about 50 weight percent of the amount of sulfur in said sulfur-containing fluid, wherein at least about 50 weight percent of said sulfur in said sulfur-containing fluid is present in the form of organosulfur compounds.
A process for minimizing sulfation of a composition, said process comprising the steps of:
- (a) charging an oxygen-containing stream to a treatment zone;
- (b) charging a sulfurized composition comprising a promoter metal and zinc sulfide to said treatment zone;
- and
- (c) contacting said sulfurized composition with said oxygen-containing stream in said treatment zone under treatment conditions sufficient to maintain an average oxygen partial pressure in a range of about 0.5 psig to less than about 2.0 psig in said treatment zone thereby minimizing sulfation of said composition while oxidizing the composition.
Dependencies are inferred from the claim text.