Mobil Oil Corporation

Robert W Bortz

William E Garwood

Quang N Le

Stephen S Wong

David S Shihabi

Rene B LaPierre

Thomas R Forbus, Jr

Chwan P Kyan

Kenneth R Graziani

A process for making a lubricant oil of low pour point which comprises a) catalytically dewaxing a lube boiling range feedstock in the presence of hydrogen over a dewaxing catalyst comprising an intermediate pore size zeolite in the hydrogen or decationized form during a dewaxing cycle in which the temperature is progressively increased to maintain a substantially constant product pour point to produce a lubricant oil product of improved oxidation stability. The feedstock is sequenced during a dewaxing cycle from a heavy feed to a lighter feed in order to avoid contacting the lighter feed with the catalyst in its most active conditions.

Catalytic dewaxing process for producing lubricating oils

Turbine oils are produced from a distillate lube fraction by hydrocracking to remove aromatics, catalytically dewaxing, hydrofinishing then treating with an organic peroxide, such as ditertiary butyl peroxide (DTBP) to increase viscosity and reduce cloud point.

Turbine oil production

Turbine oils are produced from a distillate lube fraction by solvent extraction to remove aromatics, e.g., with furfural, then dewaxing and hydrofinishing to saturate residual aromatics. Treatment with an organic peroxide, such as ditertiary butyl peroxide (DTBP), increases viscosity to compensate for the viscosity loss during the hydrofinishing. Dewaxing may be solvent or catalytic dewaxing or both. Peroxide treatment also reduces cloud point.

A process for obtaining a very high quality lube base stock is disclosed which comprises:

Process for preparing a very high quality lube base stock oil

Liquid dewaxing product recycled back as input feed in, for example, a lube dewaxing or distillate dewaxing process, provides improved catalyst performance, improved V.I. and improved yield.

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Woodbury Heights, NJ, United States of America

Robert W Bortz