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AssigneeMobil Oil Corporation
InventorsRonald H. Fischer, Yun-Yang Huang, Rene B. LaPierre, Philip Varghese
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A moderate pressure hydrocracking process in which a highly aromatic, substantially dealkylated feedstock is processed directly to high octane gasoline by hydrocracking over a catalyst, preferably comprising a large pore size, crystalline alumino-silicate zeolite hydrocracking catalyst such as zeolite Y together with a hydrogenation-dehydrogenation component. The feedstock which is preferably a light cycle oil has an aromatic content of at least 50, usually at least 60 percent and an API gravity not more than 25. The hydrocracking typically operates at 600-1000 psig at moderate to high conversion leavels to maximize the production of monocyclic aromatics which provide the requisite octane value to the product gasoline. The unconverted products from the hydrocracker are recyclied to the catalytic cracking unit to obtain further improvements in gasoline yield and octane.
A process for producing a high octane gasoline having an octane number of at least 87 (RON +0), which comprises hydrocracking a highly aromatic, substantially dealkylated hydrocarbon feed produced by the catalytic cracking of a hydrocarbon fraction, the feed having an initial boiling point of at least 300.degree. F., an aromatic content of at least 50 weight percent, and a hydrogen content not more than 12.5 weight percent at a hydrogen partial pressure of not more than 1000 psig and a conversion to a hydrocarbon fraction which has a boiling range which extends from the boiling point of a C.sub.5 hydrocarbon to 385.degree. F., of not more than 50 vol. percent and numerically equal to not more than 0.05 times the hydrogen pressure (psig) to gasoline boiling range products, and recycling the fraction which is not converted during the hydrocracking to the catalytic cracking step.
A method for the production of a high octane, hydrocracked gasoline, which comprises hydrocracking a highly aromatic, catalytically cracked light cut light cycle oil of the following properties:
Dependencies are inferred from the claim text.