Chemistry of hydrocarbon compounds – Unsaturated compound synthesis – By addition of entire unsaturated molecules – e.g.,...
Patent
1988-12-19
1990-07-03
McFarlane, Anthony
Chemistry of hydrocarbon compounds
Unsaturated compound synthesis
By addition of entire unsaturated molecules, e.g.,...
502 41, C07C 212
Patent
active
049393146
ABSTRACT:
A process is disclosed for stripping and regenerating a zeolite catalyst at relatively low pressure compared to that of an oligomerization reactor operated with a turbulent fluid-bed at above about 515 kPa (60 psig). The reactor operates either with hydrocarbons in the gas phase, or, under near-critical or supercritical conditions, when they are in the super-dense phase. The super-dense phase exists outside a critical region in the phase envelope of the hydrocarbon mixture in the reactor, under conditions at which a liquid phase may not form (hence "non-liquid"). Whether the fluid-bed reactor is operated in the C.sub.5 -C.sub.10 gasoline producing mode, the C.sub.10.sup.+ distillate mode, or, the C.sub.22.sup.+ lubes mode, continuous operation of a regenerator (for deactivated catalyst withdrawn from the reactor) at relatively low pressure, preferably less than 445 kPa (50 psig), is possible. A variable pressure "lock-stripper" recovers entrained hydrocarbon product from a recirculated catalyst stream before stripped catalyst is regenerated. Without the lock-hoppers, attrition of the catalyst would make the process uneconomical. Depending upon the process conditions, the oligomerized product is either C.sub.5 -C.sub.10 gasoline, or a "heavies" stream (either distillate or lubes), with a minor proportion by weight of gasoline range hydrocarbons.
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Harandi Mohsen N.
Owen Hartley
McFarlane Anthony
McKillop Alexander J.
Mobil Oil Corporation
Speciale Charles J.
Wise L. G.
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