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US 6,649,555 B2Granted
Reactivation of deactivated sorbents
AssigneeConocoPhillips Company
InventorsGlenn W. Dodwell, Ronald E. Brown, Robert W. Morton, Jason J. Gislason
Life of this patent
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Abstract
A deactivated sorbent composition is reactivated by contacting the deactivated sorbent with a reducing stream under activation conditions sufficient to reduce the amount of sulfates associated with the sorbent composition.
Claims42
A sorbent activation process comprising the step of:
- (a) contacting a deactivated sorbent comprising a promoter metal and at least about 2 weight percent sulfur as sulfates with a hydrogen-containing stream in an activation zone under activation conditions sufficient to reduce the valence of said promoter metal and reduce the amount of sulfates associated with said deactivated sorbent, thereby providing an activated sorbent.
A sorbent activation process comprising the steps of:
- (a) contacting a sulfurized sorbent comprising zinc sulfide and sulfates with an oxygen-containing stream in a regeneration zone under regeneration conditions sufficient to convert at least a portion of said zinc sulfide to zinc oxide, thereby providing an at least partially regenerated sorbent;
- (b) contacting at least a portion of said at least partially regenerated sorbent with a reducing stream in an activation zone under activation conditions sufficient to reduce the amount of sulfates associated with said at least partially regenerated sorbent, thereby providing an at least partially activated sorbent;
- (c) returning at least a portion of said at least partially activated sorbent to said regeneration zone for contacting with said oxygen-containing stream, thereby providing a further regenerated sorbent;
- and
- (d) returning at least a portion of said further regenerated sorbent to said activation zone for contacting with said reducing stream, thereby providing a further activated sorbent.
2 more elements
A sorbent activation process comprising the step of:
- (a) contacting a deactivated sorbent comprising a promoter metal and at least about 2 weight percent sulfur as sulfates with an hydrogen-containing stream in an activation zone under activation conditions sufficient to reduce the valence of said promoter metal and reduce the amount of sulfates associated with said deactivated sorbent, thereby providing an activated sorbent, said activation conditions including an extended activation residence time of more than about 1 hour.
A desulfurization process comprising the steps of:
- (a) deactivating a sorbent comprising a promoter metal and zinc sulfide, thereby providing a deactivated sorbent comprising sulfates;
- (b) contacting at least a portion of said deactivated sorbent with a hydrogen-containing stream in an activation zone under activation conditions sufficient to reduce the amount of sulfates associated with said deactivated sorbent, thereby providing a reactivated sorbent;
- and
- (c) contacting at least a portion of said reactivated sorbent with a sulfur-containing fluid in a desulfurization zone under desulfurization conditions sufficient to remove at least a portion of the sulfur from the sulfur-containing fluid, thereby providing a desulfurized fluid and a sulfurized sorbent.
1 more element
Dependencies are inferred from the claim text.