Process for pre-treating a desulfurization sorbent
AssigneeChina Petroleum & Chemical Corporation
InventorMark J. LaCour
Life of this patent
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Abstract
A process for presulfiding a plurality of sorbent particles prior to using at least a portion of the particles to at least partially desulfurize a hydrocarbon feed stream. Typically, presulfiding can be carried out in a presulfiding zone under presulfiding conditions. In one embodiment, the process can be carried out in a desulfurization system comprising a fluidized bed reactor and fluidized bed regenerator and can be completed in less than about 36 hours.
Claims47
A process for removing sulfur from a hydrocarbon feed stream in a desulfurization system, wherein said desulfurization system comprises a reactor and a regenerator, said process comprising:
- (a) contacting a plurality of sorbent particles with a presulfiding agent under presulfiding conditions in said reactor to thereby provide a plurality of at least partly sulfided sorbent particles;
- (b) introducing at least a portion of said at least partly sulfided sorbent particles into said regenerator;
- (c) withdrawing at least a portion of said at least partly sulfided sorbent particles from said regenerator;
- (d) returning at least a portion of said at least partly sulfided sorbent particles withdrawn from said regenerator to said reactor;
- (e) repeating steps (a) through (d) until said at least partly sulfided sorbent particles introduced into said regenerator have an average sulfur loading that is at least 15 percent greater than the initial average sulfur loading of said sorbent particles prior to said contacting of step (a);
- and
- (f) subsequent to step (e), contacting said at least partly sulfided sorbent particles with said hydrocarbon feed stream under desulfurization conditions in said reactor to thereby provide a sulfur-depleted effluent stream and a sulfur-laden sorbent,
- wherein the average sulfur loading of said at least partly sulfided sorbent particles introduced into said regenerator in step (b) is within 5 percent of the average sulfur loading of the at least partly sulfided sorbent particles withdrawn from said regenerator in step (c).
A process for desulfurizing a sulfur-containing hydrocarbon feed stream, said process comprising:
- (a) introducing a plurality of sorbent particles into a reaction zone, wherein said sorbent particles have an average sulfur loading of less than 1.75 weight percent;
- (b) contacting at least a portion of said sorbent particles with a presulfiding agent in said reaction zone under presulfiding conditions to thereby provide a plurality of at least partly sulfided sorbent particles;
- (c) repeating step (b) out until said at least partly sulfided sorbent particles have an average sulfur loading greater than 2.0 weight percent;
- (d) subsequent to step (c), introducing said hydrocarbon feed stream into said reaction zone;
- (e) contacting at least a portion of said at least partly sulfided sorbent particles with at least a portion of said hydrocarbon feed stream in said reaction zone under desulfurization conditions to thereby provide a sulfur-laden sorbent and a sulfur-depleted effluent stream;
- (f) regenerating at least a portion of said sulfur-laden sorbent in a regeneration zone under regeneration conditions to thereby provide a regenerated sorbent composition;
- and
- (g) introducing at least a portion of said regenerated sorbent composition back into said reaction zone.
Dependencies are inferred from the claim text.