초록

A process is provided for preparing high quality Group II and Group III lubricating base oils from a sulfur containing feedstock using mild hydrotreating followed by isomerization/dewaxing followed by hydrogenation over a sulfur resistant hydrogenation catalyst.

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[ What is claimed is:] [1.] A process for producing a lubricating oil base stock comprising:a) contacting a petroleum feedstock which has a normal boiling point in the range of about 600.degree. F. (316.degree. C.) to about 1250.degree. F. (677.degree. C.) in a hydrotreating reaction zone with a hyd

[ What is claimed is:] [1.] A process for producing a lubricating oil base stock comprising:a) contacting a petroleum feedstock which has a normal boiling point in the range of about 600.degree. F. (316.degree. C.) to about 1250.degree. F. (677.degree. C.) in a hydrotreating reaction zone with a hydrotreating catalyst at a hydrogen partial pressure of less than about 1600 psia (11 MPa) and a temperature between about 500.degree. F. (260.degree. C.) and about 800.degree. F. (427.degree. C.) to produce a hydrotreated oil having a viscosity index which is at least about 5 greater than the viscosity index of the petroleum feedstock and a viscosity measured at 100.degree. C. of at least about 2 cSt;b) contacting the hydrotreated oil at hydrodewaxing conditions in a dewaxing reaction zone with an intermediate pore size molecular sieve catalyst to produce a dewaxed oil having a pour point lower than the pour point of the hydrotreated oil; andc) contacting the dewaxed oil at hydrogenation conditions in a hydrofinishing reaction zone with a hydrogenation catalyst comprising a platinum/palladium alloy to produce a lubricating oil base stock, wherein the platinum/palladium molar ratio of the platinum/palladium alloy is between about 2.5:1 and about 1:2.