Two-stage hydrocracking-hydrotreating process to make lube oil

Claim 2

The process of claim 2 wherein the catalysts are in sulfide form.

Claim 3

The process of claim 3 wherein the hydrocracking catalyst contains about 2 to 10 weight percent nickel, about 10 to 20 percent of the member selected from the group consisting of tungsten and molybdenum on an oxide basis, and about 2 to 10 percent boria.

Claim 4

The process of claim 4 wherein the selected member of the catalyst employed in the hydrocracking stage is tungsten.

Claim 5

The process of claim 2 wherein said hydrogenation conditions include a temperature of about 550*to 825* F., a hydrogen partial pressure of about 1,000 to 5,000 p.s.i.g., a weight hourly space velocity of about 0.3 to 5 WHSV and a molecular hydrogen to hydrocarbon feed ratio of about 500 to 3,500 standard cubic feet per barrel of feed.

Claim 6

The process of claim 6 wherein the catalyst employed in the hydrogenation stage contains minor, catalytically-effective amounts of a member selected from the group consisting of nickel and cobalt, and molybdenum on alumina.

Claim 7

The process of claim 7 wherein the catalyst is in sulfide form.

Claim 8

The process of claim 8 wherein the hydrocracking catalyst contains about 2 to 10 weight percent nickel, about 10 to 20 percent of the member selected from the group consisting of tungsten and molybdenum on an oxide basis, and about 2 to 10 percent boria.

Claim 9

A process of preparing a mineral hydrocarbon lubricating oil having a viscosity index of at least about 90 on a dewaxed basis which comprises: a. Contacting a mineral hydrocarbon oil feedstock of lubricating viscosity at 210* F., at least 90 weight percent of which boils above about 1,000* F. and having a viscosity index of about 50 to 80, with molecular hydrogen under hydrocracking conditions including a temperature of about 750* to 850* F., a hydrogen partial pressure of about 1,500 to 3,000 p.s.i.g., a weight hourly space velocity of about 0.5 to 2 WHSV and a molecular hydrogen to hydrocarbon feed ratio of about 1,500 to 3,000 standard cubic feet per barrel of feed, in the presence of a catalyst containing about 2 to 10 weight percent nickel, about 10 to 20 percent tungsten on an oxide basis and about 2 to 10 percent boria on an active alumina support, the metals of the catalyst being present in the sulfide form; and b. Contacting hydrocarbon oil of lubricating viscosity from step (a) with molecular hydrogen under hydrogenation conditions, including a temperature of about 600* to 800* F., a hydrogen partial pressure of about 1,500 to 3,000 p.s.i.g., a weight hourly space velocity of about 0.5 to 3 WHSV and a molecular hydrogen to hydrocarbon feed ratio of about 1,500 to 2,500 standard cubic feet per barrel of feed in the presence of a solid hydrogenation catalyst containing minor, catalytically effective amounts of a member selected from the group consisting of nickel and cobalt, and molybdenum on alumina, the metals of the catalyst being present in the sulfide form, to produce oil of lubricating viscosity having a viscosity index of at least about 90 and at least about 30 viscosity index numbers greater than the hydrocarbon oil feedstock passing to step (a).

Claim 10

The process of claim 1 wherein the product from step (b) is fractionated to separate oil of lubricating viscosity and the lubricating oil fraction is dewaxed.

Claim 11

The process of claim 10 wherein the product from step (b) is fractionated to separate oil of lubricating viscosity and the lubricating oil fraction is dewaxed.