Catalytic dewaxing process employing surface acidity deactivated zeolite catalysts
AssigneeMobil Oil Corporation
InventorsRobert J. Anthes, Ross A. Kremer
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Abstract
Catalytic dewaxing of a waxy component-containing hydrocarbon feed is accomplished with improved selectivity employing, as catalyst, a zeolite the surface acid catalytic activity of which has been at least partially reduced by chemisorption of a surface-deactivating agent such as a bulky amine thereon. The invention is especially useful for the hydrodewaxing of a waxy lube range product to provide a high viscosity index, low pour point, low cloud point lubricating oil product.
Claims26
In a process for dewaxing a waxy component-containing hydrocarbon feedstock in which the feed is contacted with a zeolite hydrodewaxing catalyst under hydrodewaxing conditions to provide a dewaxed product, the improvement which comprises employing a zeolite hydrodewaxing catalyst, the zeolite surface of which has been at least partially deactivated for acid catalyzed reactions by chemisorption of a sterically-hindered amine surface-deactivating agent which possesses an average cross section diameter greater than that of the zeolite pores.
A process for catalytically hydrodewaxing a waxy component-containing lubricating oil derived from the oligomerization of a lower olefin which comprises contacting said oil with a zeolite hydrodewaxing catalyst under hydrodewaxing conditions to provide a dewaxed lubricating oil of high viscosity index, low pour point and low cloud point, the surface of the zeolite being at least partially deactivated for acid catalyzed reactions by chemisorption of a sterically-hindered amine surface-deactivating agent which possessed an average cross section diameter greater than that of the zeolite pores.
The process of cl aim 17 wherein the waxy component-containing lubricating oil is at least a C.sub.10 + fraction of a propylene oligomer obtained by the catalytic oligomerization of propylene in the presence of a surface-deactivated zeolite olefin oligomerization catalyst to provide an intermediate propylene oligomer product followed by the further acid catalytic oligomerization of at least a portion of the intermediate oligomer product to provide a lube range product which is then fractionated to provide said waxy component-containing lubricating oil fraction.
Dependencies are inferred from the claim text.