Back to results
US 7,842,180 B1Granted
Hydrocracking process
AssigneeUop LLC
InventorsLaura E. Leonard, Peter Kokayeff
Life of this patent
Estimating the term…
Abstract
A hydrocracking process wherein a liquid phase stream comprising a hydrocarbonaceous feedstock and a liquid phase effluent from a hydrocracking zone and a sufficiently low hydrogen concentration to maintain a liquid phase continuous system into a hydrotreating zone. A portion of the effluent from the hydrotreating zone comprising unconverted hydrocarbons is introduced into the hydrocracking zone with a sufficiently low hydrogen concentration to maintain a liquid phase continuous system.
Claims18
A process for hydrocracking a hydrocarbonaceous feedstock which comprises:
- (a) introducing a liquid phase stream comprising a hydrocarbonaceous feedstock, a liquid phase effluent from a hydrocracking zone, and a sufficiently low hydrogen concentration to maintain a liquid phase continuous system into a hydrotreating zone to produce hydrogen sulfide and ammonia and provide a first hydrocarbonaceous stream comprising hydrocarbons having a reduced level of sulfur and nitrogen;
- (b) passing an effluent stream from the hydrotreating zone to a heat exchanger to cool the effluent stream;
- (c) passing the cooled effluent stream to a vapor liquid separator to provide a first vapor stream comprising hydrogen sulfide and ammonia, and a second hydrocarbonaceous stream;
- (d) recovering unconverted hydrocarbons boiling in the range of the hydrocarbonaceous feedstock from the second hydrocarbonaceous stream;
- (e) introducing the unconverted hydrocarbons boiling in the range of the hydrocarbonaceous feedstock recovered in step (d) into the hydrocracking zone with a sufficiently low hydrogen concentration to maintain a liquid phase continuous system and
- (f) recovering hydrocracked hydrocarbons boiling in a temperature range lower than the hydrocarbonaceous feedstock.
3 more elements
A process for hydrocracking a hydrocarbonaceous feedstock which comprises:
- (a) introducing a liquid phase stream comprising a hydrocarbonaceous feedstock and a liquid phase effluent from a hydrocracking zone and a sufficiently low hydrogen concentration to maintain a liquid phase continuous system into a hydrotreating zone to produce hydrogen sulfide and ammonia, and provide a first hydrocarbonaceous stream containing hydrocarbons having a reduced level of sulfur and nitrogen;
- (b) passing an effluent stream from the hydrotreating zone to a heat exchanger to partially condense the effluent stream;
- (c) passing the partially condensed effluent stream to a first vapor-liquid separator to provide a first vapor steam comprising hydrogen, hydrogen sulfide and ammonia, and a second hydrocarbonaceous stream;
- (d) passing the second hydrocarbonaceous stream to a second vapor-liquid separator to provide a second vapor stream comprising normally gaseous hydrocarbons and hydrogen, and a third hydrocarbonaceous stream;
- (e) recovering hydrocarbons boiling in the range of the hydrocarbonaceous feedstock from the third hydrocarbonaceous stream;
- (f) introducing the hydrocarbons boiling in the range of the hydrocarbonaceous feedstock recovered in step (e) into the hydrocracking zone;
- and
- (g) recovering hydrocracked hydrocarbons boiling in a temperature range less than the hydrocarbonaceous feedstock.
5 more elements
A process for hydrocracking a hydrocarbonaceous feedstock which comprises:
- (a) introducing a liquid phase stream comprising a hydrocarbonaceous feedstock boiling at a temperature from about 315° C. (600° F.) to about 565° C. (1050° F.) and a liquid phase effluent from a hydrocracking zone and a sufficiently low hydrogen concentration to maintain a liquid phase continuous system into a hydrotreating zone to produce hydrogen sulfide and ammonia, and provide a first hydrocarbonaceous stream containing hydrocarbons having a reduced level of sulfur and nitrogen;
- (b) passing an effluent stream from the hydrotreating zone to a heat exchanger to partially condense the effluent stream;
- (c) passing the partially condensed effluent stream to a first vapor liquid separator operated at a pressure from about 3.5 MPa (500 psig) to about 17.3 MPa (2500 psig) and a temperature from about 15.6° C. (60° F.) to about 65° C. (150° F.) to provide a first vapor stream comprising hydrogen, hydrogen sulfide and ammonia, and a second hydrocarbonaceous stream;
- (d) passing the second hydrocarbonaceous stream to a second vapor-liquid separator operated at a pressure from about 790 kPa (100 psig) to about 3500 kPa (500 psig) and a temperature from about 15.6° C. (60° F.) to about 65° C. (150° F.) to provide a second vapor stream comprising normally gaseous hydrocarbons and hydrogen and a third hydrocarbonaceous stream;
- (e) recovering hydrocarbons boiling in the range of the hydrocarbonaceous feedstock from the third hydrocarbonaceous stream;
- (f) introducing the hydrocarbons boiling in the range of the hydrocarbonaceous feedstock recovered in step (e) into the hydrocracking zone;
- and
- (g) recovering hydrocracked hydrocarbons boiling in a temperature range less than the hydrocarbonaceous feedstock.
5 more elements
Dependencies are inferred from the claim text.