Hydrocracking process

Details Hydrocracking process Hydrocracking process

2005-02-22

2005-02-22

Dang, Thuan D. (Department: 1764)

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

C208S107000, C208S108000, C208S111010, C208S111350, C208S112000, C208S049000, C208S058000

Reexamination Certificate

active

06858128

ABSTRACT:
A catalytic hydrocracking process wherein a hydrocarbonaceous feedstock and a liquid recycle stream is contacted with hydrogen in a hydrocracking reaction zone at elevated temperature and pressure to obtain conversion to lower boiling hydrocarbons. A liquid hydrocarbonaceous stream produced from the effluent of the hydrocracking reaction zone is fractionated in a first zone of a divided-wall fractionation zone to produce at least one liquid hydrocarbonaceous product stream and a liquid hydrocarbonaceous stream containing hydrocarbons boiling at a temperature in the boiling range of the feedstock and heavy polynuclear aromatic compounds. At least a portion of the liquid hydrocarbonaceous stream containing heavy polynuclear aromatic compounds is introduced into a second zone of the divided-wall fractionation zone to produce a stream rich in polynuclear aromatic compounds. At least another portion of the liquid hydrocarbonaceous stream containing hydrocarbons boiling at a temperature in the boiling range of the feedstock is recycled to the hydrocracking reaction zone.

REFERENCES:
patent: 3328290 (1967-06-01), Hengstebeck
patent: 3437584 (1969-04-01), Hamblin
patent: 5114562 (1992-05-01), Haun et al.
patent: 5120427 (1992-06-01), Stine et al.
patent: 5720872 (1998-02-01), Gupta
patent: PCTUS97/04270 (1997-10-01), None
patent: WO 9738066 (1997-10-01), None

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