Stabilizing hydrocracked lubricating oils

Claim 2

The process of claim 1 in which said Y-zeolite is faujasite having a silica/alumina mole ratio greater than 3/1 and uniform pore openings of about 6 to 15 A.

Claim 3

The process of claim 2 in which said hydrocracking catalyst is an oxide or sulfide of a metal chosen from the group consisting of Group VB, VIB and VIII of the Periodic System and mixtures thereof.

Claim 4

A process of forming a lubricating oil fraction resistant to deterioration upon exposure to light and air which comprises contacting a hydrocarbon fraction, at hydrocracking conditions, with a hydrocracking catalyst to form a plurality of fractions including lubricating oil fractions, percolating said lubricating oil fractions at temperature below 150* F. with a catalyst comprising silica-alumina gel matrix containing Y-zeolite and recovering a light and air stable lubricating oil fraction.

Claim 5

The process of claim 5 in which said silica-alumina gel matrix containing Y-zeolite is a physically combined mixture of an amorphous cracking catalyst containing a major amount of silica and a minor amount of alumina and said Y-zeolite.

Claim 6

The process of claim 5 in which said Y-zeolite is faujasite having a silica-alumina mole ratio greater than about 3/1 and uniform pore openings of about 6 to 15 A.

Claim 7

The process of claim 5 in which said silica-alumina gel matrix containing Y-zeolite consists of 95 wt. percent of a mixture of Al2O3/SiO2, in the proportion of 13 wt. % Al2O3 and 87 wt. % SiO2, with 5 wt. percent faujasite.

Claim 8

The process of claim 5 wherein said silica-alumina gel matrix containing Y-zeolite is regenerated by washing with benzene.

Claim 9

The process of claim 5 wherein said lubricating oil fractions are dewaxed prior to contact with said silica-alumina gel matrix containing Y-zeolite.

Claim 10

A process for forming a stabilized lubricating oil fraction resistant to deterioration upon exposure to light and air comprising subjecting a high boiling hydrocarbon fraction to hydrocracking conditions in the presence of a hydrocracking catalyst to form a plurality of fractions including lubricating oil fractions boiling above about 650* F., dewaxing said lubricating oil fractions, percolating at least a portion of said dewaxed lubricating oil fractions through a catalyst comprising silica-alumina gel matrix containing Y-zeolite and recovering a light and air stable lubricating oil fraction.

Claim 11

The process of claim 11 in which said silica-alumina gel matrix containing Y-zeolite is a physically combined mixture of an amorphous cracking catalyst containing a major amount of silica and a minor amount of alumina and said Y-zeolite.

Claim 12

The process of claim 11 in which said Y-zeolite is faujasite having a silica-alumina mole ratio greater than about 3/1 and uniform pore openings of about 6 to 15 A.

Claim 13

The process of claim 11 in which said silica-alumina gel matrix containing Y-zeolite consists of 95 wt. percent of a mixture of Al2O3/SiO2, in the proportion of 13 wt. % Al2O3 and 87 wt. % SiO2 with 5 wt. percent faujasite.

Claim 14

The process of claim 11 wherein said silica-alumina gel matrix containing Y-zeolite is regenerated by washing with benzene.

Claim 15

The process of claim 11 wherein said percolation is conducted at a temperature less than about 150* F.