C - Chemistry – Metallurgy – 10 – G
Patent
C - Chemistry, Metallurgy
10
G
196/147
C10G 47/02 (2006.01)
Patent
CA 1288077
"CONTROL OF POLYNUCLEAR AROMATIC BY-PRODUCTS IN A HYDROCRACKING PROCESS" ABSTRACT The detrimental effects of polynuclear aromatic (PNA) by-products are controlled in a catalytic hydrocracking process by (a) introducing a reduced crude into a vacuum fractionation zone to produce a vacuum gas oil stream having a propensity to form detrimental PNA compounds in a hydrocracking zone and a slop wax side stream and a vacuum bottoms; (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 and to form trace quantities of PNA; (c) partially condensing the hydrocarbon effluent from the hydrocracking zone and separating the same into a low boiling hydrocarbon product stream and a stream containg unconverted hydrocarbons boiling above about 650°F (343°C) and trace quantities of PNA compounds; and (d)introducing at least a portion of the stream containing the unconverted hydrocarbons and PNA compounds into the vacuum fractionation zone thereby recovering a substantial portion of the polynuclear aromatic compounds in the slop wax side stream which significantly minimizes the introduction of the detrimental PNA compounds into the hydrocracking zone.
548158
Macrae & Co.
Uop Inc.
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