Hydrocracking process
AssigneeUop LLC
InventorsTom N. Kalnes, Richard K. Hoehn
Life of this patent
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Abstract
A catalytic hydrocracking process wherein a denitrification and desulfurization reaction zone effluent is heat-exchanged with a hydrogen-rich gaseous stream and introduced into a hydrocracking zone. The resulting effluent from the hydrocracking zone is passed directly without cooling into a hot, high-pressure stripper utilizing a hot, hydrogen-rich gaseous stream at least a portion of which is heated during the heat exchange with the denitrification and desulfurization reaction zone effluent. The stripper overhead is partially condensed to produce a hydrogen-rich gaseous stream and a liquid stream containing hydrocracked hydrocarbon compounds. At least a portion of the stripper bottoms is recycled to the denitrification and desulfurization reaction zone.
Claims12
A process for hydrocracking a hydrocarbonaceous feedstock which process comprises:
- (a) passing a hydrocarbonaceous feedstock, a liquid recycle stream and hydrogen to a denitrification and desulfurization reaction zone containing a catalyst and recovering a denitrification and desulfurization reaction zone effluent therefrom;
- (b) passing said denitrification and desulfurization reaction zone effluent to an indirect heat exchange zone to remove heat therefrom;
- (c) passing the resulting cooled denitrification and desulfurization reaction zone effluent to a hydrocracking zone containing hydrocracking catalyst;
- (d) passing a resulting effluent from said hydrocracking zone directly to a hot, high pressure stripper utilizing a hot, hydrogen-rich stripping gas to produce a first vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of said hydrocarbonaceous feedstock, hydrogen sulfide and ammonia, and a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of said hydrocarbonaceous feedstock;
- (e) passing at least a portion of said first liquid stream comprising hydrocarbonaceous compounds boiling in the range of said hydrocarbonaceous feedstock as at least a portion of said liquid recycle stream to said denitrification and desulfurization reaction zone;
- (f) condensing at least a portion of said first vapor stream to produce a second liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of said hydrocarbonaceous feedstock and a second vapor stream comprising hydrogen and hydrogen sulfide;
- (g) introducing at least a portion of said second vapor stream to said indirect heat exchange zone;
- (h) removing a resulting heated second vapor stream from said indirect heat exchange zone to provide at least a portion of said hot, hydrogen-rich stripping gas of step (d);
- and
- (i) recovering said second liquid stream produced in step (f).
Dependencies are inferred from the claim text.