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US 6,387,245 B1Granted
Hydrocracking process
AssigneeUop LLC
InventorsTom N. Kalnes, David B. Gates
Life of this patent
Estimating the term…
Abstract
A hydrocracking process wherein a hydrocarbonaceous feedstock and a hot hydrocracking zone effluent containing hydrogen is passed to a hydrocracking reaction zone to produce lower boiling hydrocarbon compounds. The resulting hot, uncooled effluent from the hydrocracking zone is hydrogen stripped in a stripping zone maintained at essentially the same pressure as the preceding hydrocracking reaction zone with a hydrogen-rich gaseous stream to produce a vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the fresh feedstock, hydrogen sulfide and ammonia, and a liquid hydrocarbonaceous stream which is countercurrently contacted with hydrogen in a hydrogenation zone located in the bottom end of the stripping zone.
Claims18
A process for hydrocracking a hydrocarbonaceous feedstock to produce lower boiling hydrocarbonaceous compounds which process comprises:
- (a) contacting the hydrocarbonaceous feedstock, a liquid recycle stream having a temperature greater than about 500° F. and saturated with hydrogen, and added hydrogen with a metal promoted hydrocracking catalyst in a hydrocracking zone at elevated temperature and pressure sufficient to obtain a substantial conversion to lower boiling hydrocarbons;
- (b) passing the hydrocracking zone effluent 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 the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia, and a downwardly flowing liquid comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock;
- (c) simultaneously contacting the downwardly flowing liquid in the hot, high pressure stripper with a hydrotreating catalyst and an upwardly flowing hydrogen stream to produce a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock;
- (d) passing at least a portion of the first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock to the hydrocracking zone operating at a temperature from about 400° F. to about 900° F., a pressure from about 500 psig to about 2500 psig and a liquid hourly space velocity from about 0.1 hr−1 to about 15 hr−1;
- (e) condensing at least a portion of the first vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia to produce a second liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock and a second vapor stream comprising hydrogen and hydrogen sulfide;
- and
- (f) passing at least a portion of the second vapor stream to the hydrocracking zone.
4 more elements
A process for hydrocracking a hydrocarbonaceous feedstock to produce lower boiling hydrocarbonaceous compounds which process comprises:
- (a) contacting the hydrocarbonaceous feedstock, a liquid recycle stream having a temperature greater than about 500° F. and saturated with hydrogen, and added hydrogen with a metal promoted hydrocracking catalyst in a hydrocracking zone at elevated temperature and pressure sufficient to obtain a substantial conversion to lower boiling hydrocarbons;
- (b) passing the hydrocracking zone effluent 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 the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia, and a downwardly flowing liquid comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock;
- (c) simultaneously contacting the downwardly flowing liquid in the hot, high pressure stripper with a hydrotreating catalyst and an upwardly flowing hydrogen stream to produce a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock;
- (d) passing at least a portion of the first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock to the hydrocracking zone operating at a temperature from about 400° F. to about 900° F., a pressure from about 500 psig to about 2500 psig and a liquid hourly space velocity from about 0.1 hr−1 to about 15 hr−1;
- (e) condensing at least a portion of the first vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia to produce a second liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock and a second vapor stream comprising hydrogen and hydrogen sulfide;
- (f) passing at least a first portion of the second vapor stream to the hydrocracking zone;
- (g) introducing at least a second portion of the second vapor stream into a reflux heat exchange zone located in an upper end of the stripper to produce reflux;
- and
- (h) removing and heating the second portion of the second vapor stream from the reflux heat exchange zone and introducing the second portion of the second vapor stream into a lower end of the stripper to supply stripping medium and upwardly flowing hydrogen.
6 more elements
A process for hydrocracking a hydrocarbonaceous feedstock to produce lower boiling hydrocarbonaceous compounds which process comprises:
- (a) contacting the hydrocarbonaceous feedstock, a liquid recycle stream having a temperature greater than about 500° F. and saturated with hydrogen, and added hydrogen with a metal promoted hydrocracking catalyst in a hydrocracking zone at elevated temperature and pressure sufficient to obtain a substantial conversion to lower boiling hydrocarbons;
- (b) passing the hydrocracking zone effluent 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 the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia, and a downwardly flowing liquid comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock;
- (c) simultaneously contacting the downwardly flowing liquid in the hot, high pressure stripper with a hydrotreating catalyst and an upwardly flowing hydrogen stream to produce a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock;
- (d) passing at least a portion of the first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock to the hydrocracking zone operating at a temperature from about 400° F. to about 900° F., a pressure from about 500 psig to about 2500 psig and a liquid hourly space velocity from about 0.1 hr−1 to about 15 hr−1;
- (e) passing at least a portion of the first vapor stream produced in step (b) to a post-treat hydrogenation reaction zone to saturate aromatic compounds;
- (f) condensing at least a portion of the resulting effluent from the post-treat hydrogenation reaction zone to produce a second liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock and a second vapor stream comprising hydrogen and hydrogen sulfide;
- and
- (g) passing at least a portion of the second vapor stream to the hydrocracking zone.
5 more elements
A process for hydrocracking a hydrocarbonaceous feedstock to produce lower boiling hydrocarbonaceous compounds which process comprises:
- (a) contacting the hydrocarbonaceous feedstock, a liquid recycle stream having a temperature greater than about 500° F. and saturated with hydrogen, and added hydrogen with a metal promoted hydrocracking catalyst in a hydrocracking zone at elevated temperature and pressure sufficient to obtain a substantial conversion to lower boiling hydrocarbons;
- (b) passing the hydrocracking zone effluent 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 the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia, and a downwardly flowing liquid comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock;
- (c) simultaneously contacting the downwardly flowing liquid in the hot, high pressure stripper with a hydrotreating catalyst and an upwardly flowing hydrogen stream to produce a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock;
- (d) passing at least a portion of the first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock to the hydrocracking zone operating at a temperature from about 400° F. to about 900° F., a pressure from about 500 psig to about 2500 psig and a liquid hourly space velocity from about 0.1 hr−1 to about 15 hr−1;
- (e) passing at least a portion of the first vapor stream produced in step (b) to a post-treat hydrogenation reaction zone to saturate aromatic compounds;
- (f) condensing at least a portion of the resulting effluent from the post-treat hydrogenation reaction zone to produce a second liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock and a second vapor stream comprising hydrogen and hydrogen sulfide;
- (g) passing at least a portion of the second vapor stream to the hydrocracking zone;
- (h) introducing at least a second portion of the second vapor stream into a reflux heat exchanger located in an upper end of the stripper to produce reflux;
- and
- (i) removing and heating the second portion of the second vapor stream from the reflux heat exchange zone and introducing the second portion of the second vapor stream into a lower end of the stripper to supply stripping medium and upwardly flowing hydrogen.
7 more elements
A process for hydrocracking a hydrocarbonaceous feedstock to produce lower boiling hydrocarbonaceous compounds which process comprises:
- (a) contacting the hydrocarbonaceous feedstock, a liquid recycle stream having a temperature greater than about 500° F. and saturated with hydrogen, and added hydrogen after hydrotreating with a metal promoted hydrocracking catalyst in a hydrocracking zone at elevated temperature and pressure sufficient to obtain a substantial conversion to lower boiling hydrocarbons;
- (b) passing the hydrocracking zone effluent 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 the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia, and a downwardly flowing liquid comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock;
- (c) simultaneously contacting the downwardly flowing liquid in the hot, high pressure stripper with a hydrotreating catalyst and an upwardly flowing hydrogen stream to produce a first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock;
- (d) passing at least a portion of the first liquid stream comprising hydrocarbonaceous compounds boiling in the range of the hydrocarbonaceous feedstock to the hydrocracking zone operating at a temperature from about 400° F. to about 900° F., a pressure from about 500 psig to about 2500 psig and a liquid hourly space velocity from about 0.1 hr−1 to about 15 hr−1;
- (e) condensing at least a portion of the first vapor stream comprising hydrogen, hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock, hydrogen sulfide and ammonia to produce a second liquid stream comprising hydrocarbonaceous compounds boiling at a temperature below the boiling range of the hydrocarbonaceous feedstock and a second vapor stream comprising hydrogen and hydrogen sulfide;
- and
- (f) passing at least a portion of the second vapor stream to the hydrocracking zone.
4 more elements
Dependencies are inferred from the claim text.