C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/706.8
C07C 2/12 (2006.01) B01J 29/90 (2006.01) C07C 2/00 (2006.01) C07C 11/02 (2006.01) C10G 50/00 (2006.01)
Patent
CA 2005452
F-5105 METHOD FOR ON-STREAM LOW-PRESSURE REGENERATION OF AN OLIGOMERIZATION CATALYST FROM A FLUID-BED REACTOR OPERATING AT HIGH PRESSURE WITH HYDROCARBONS IN A NON-LIQUID PHASE 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 515 kPa (60 psig). The reactor operates either with hydrocarbons in the gas phase, or, under near-critical or super-critical 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 C5-C10 gasoline producing mode, the C+10 distillate mode, or, the C+22 lubes mode, continuous operation of a regenerator (for deactivated catalyst withdrawn from the reactor) at relatively low pressure, preferably less than 445 kPa (50 psig), is possible.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. As an alternative, a purging lock-hopper will step down the pressure and a stripper upstream of the regenerator and can strip the catalyst before it is regenerated. Without the lock-hoppers, attrition of the catalyst would make the process uneconomical. Regenerated catalyst is pressurized with feed in a charging lock-hopper downstream of the regenerator, and flowed to the reactor. The process results in oligomerization of a "light gas" or light naphtha, or other predominantly C3-C5 olefin feed, the remainder being mainly lower alkanes. Depending upon the process conditions, the oligomerized product is either C5-C10 gasoline, or a "heavies" stream (either distillate or lubes), with a minor proportion by weight of gasoline range hydrocarbons.
Harandi Mohsen N.
Owen Hartley
Kirby Eades Gale Baker
Mobil Oil Corporation
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