Process for producing lubrication oil of high viscosity index

Details Process for producing lubrication oil of high viscosity index Process for producing lubrication oil of high viscosity index

1986-05-28

1988-05-17

Sneed, Helen M. S.

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208 89, C10G 4500, C10G 4702

Patent

active

047448849

ABSTRACT:
Full-range shale oils or fractions thereof, after hydrotreating, or hydrowaxed and then hydrogenated to produce lubricating oil fractions boiling above 650.degree. F., having a pour point at or below +10.degree. F., and a viscosity index of at least 95. In the preferred operation, the hydrogenation is effected with a noble metal-containing catalyst wherein the noble metal is dispersed by cation exchange into a carrier comprising a silica-alumina cogel or copolymer dispersed in a large pore alumina gel matrix. It has been found with shale oils that the hydrogenation in the preferred embodiment also results in hydrocracking of some of the polynaphthenic compounds. Since polynaphthenic compounds can contribute to or themselves cause low viscosity index in lubricating base oil, the invention is believed particularly applicable to those feedstocks, not necessarily of shale origin, wherein it is desired or necesary to raise the viscosity index by hydrogenation with simultaneous hydrocracking of polynaphtenic compounds .

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