| 摘要 |
A method is described for selectively dewaxing a waxy hydrocarbon oil feedstock which method comprises contacting said waxy hydrocarbon oil stock in the presence of hydrogen with a zeolite (1) which has been chemically modified by reaction, under dry, anhydrous conditions, with an organosilane wherein the zeolite has some reactive sites capable of reacting with the organosilane and where said organosilane is: (a) capable of entering into the channels of the zeolite and chemically reacting with the reactive sites present therein, as well as (b) reacting with hydroxyl groups present on the external surface of said zeolite, and (2) which has been loaded with a catalytically active hydrogenating metal component; which contacting is conducted under conditions of pressure, temperature and liquid flow velocities sufficient to effect the hydrodewaxing. Preferably the organosilane modified zeolite, either before or after the deposition of the catalytic metal component may be heated to an elevated temperature in an inert or reducing atmosphere. This heating may be conducted as an independent operation or may be conducted in situ in the catalytic dewaxing environment. In either case, the atmosphere employed is inert or reducing and is preferably hydrogen or contains hydrogen. Such deliberate or in situ heating is conducted to form a stable surface resulting from condensation-polymerization reactions.
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