Selective dewaxing of hydrocarbon oil using surface modified zeolites

Abstract From the Canadian patent

A method for selectively dewaxing a waxy hydrocarbon oil feedstock comprising 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 …