Hydrocracking and recovering polynuclear aromatic compounds in s

Details Hydrocracking and recovering polynuclear aromatic compounds in s Hydrocracking and recovering polynuclear aromatic compounds in s

1986-01-23

1987-10-06

Chaudhurt, Olik

Mineral oils: processes and products

Chemical conversion of hydrocarbons

With preliminary treatment of feed

208 96, 208 97, 208100, C10G 6702, C10G 6704

Patent

active

046981462

ABSTRACT:
A catalytic hydrocracking process which comprises (a) introducing a reduced crude into a fractionation zone to produce a vacuum gas oil stream having a propensity to form polynuclear aromatic compounds in a hydrocracking zone and a slop wax stream; (b) contacting the vacuum gas oil stream in a hydrocracking zone with added hydrogen and a metal promoted hydrocracking catalyst at elevated temperature and pressure sufficient to gain a substantial conversion to lower boiling products; (c) partially condensing the hydrocarbon effluent from the hydrocracking zone and separating the same into a low boiling hydrocarbon product stream and an unconverted hydrocarbon stream boiling above about 650.degree. F. (343.degree. C.) and containing trace quantities of polynuclear aromatic compounds; and (d) introducing at least a portion of the unconverted hydrocarbon stream containing polynuclear aromatic compounds into the fractionation zone thereby recovering a substantial portion of the polynuclear aromatic compounds in the slop wax stream which significantly minimizes the introduction of the polynuclear aromatic compounds into the hydrocracking zone.

REFERENCES:
patent: 3185639 (1965-05-01), Paterson
patent: 3281350 (1966-10-01), Codet et al.
patent: 3619407 (1971-11-01), Hendricks et al.
patent: 3779895 (1973-12-01), Wilson et al.
patent: 4087354 (1978-05-01), Hessler
patent: 4447315 (1984-05-01), Lamb et al.
Handbook of Chemistry and Physics, 63RD., CRC Press Inc. (1982-1983).

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