Mobil Oil Corporation

Bernard M Gillespie

Michael S Sarli

Thomas R Stein

Henry R Ireland

Kenneth W Smith

Nai Y Chen

Lube base stock oil of low pour point and excellent stability is produced from a waxy crude oil fraction by solvent refining, catalytic dewaxing over a zeolite catalyst in the nature of zeolite ZSM-5 and hydrotreating under specified conditions.

Manufacture of lube base stock oil

Specialty oils of very low pour point and excellent stability, such as transformer oils and refrigerator oils, are produced from waxy crude distillates by solvent refining, catalytic dewaxing over a zeolite catalyst in the nature of zeolite ZSM-5 and hydrotreating.

Manufacture of specialty oils

A hydrocarbon fuel oil composition comprising a blend of untreated low pour-point distillate oil and a higher pour-point catalytically hydrodewaxed distillate oil. The blend has an unexpectedly low pour point and cloud point. Dewaxing is effected with a ZSM-5 type catalyst.

Hydrodewaxing

This invention concerns a method of regenerating hydroprocessing catalyst. The invention deals with a method of regenerating hydroprocessing catalyst contained within a reactor, said catalyst having been deactivated by 'coke' deposition, comprising: passing into an inlet of said reactor, through said catalyst to be regenerated, and out an outlet of said reactor, a stream of substantially inert gases initially containing about 0.1 to 4.0 volume percent oxygen at an initial temperature of about 600.degree. to 1200.degree. F, a pressure of at least about 100 psig and a space velocity of at least about 50 GHSV; and increasing said oxygen concentration to about 1.0 to 10.0 volume % and/or increasing the temperature to about 800.degree. to 1200.degree. F upon detection of oxygen at said outlet of said catalyst containing reactor.

Hydroprocessing catalyst regeneration

A method for the operation of a hydrodewaxing unit wherein a petroleum distillate is separated into two streams, one having a pour point of above about 30.degree.F, and the other having a pour point of less than about 30.degree.F., the 30.degree.F plus pour point fraction is treated in a hydrodewaxing unit with a ZSM-5 type catalyst under hydroprocessing conditions while the 30.degree.F. minus pour point portion is untreated and combined with the hydrodewaxed product. The process yields a net production of hydrogen, and exhibits excellent catalyst aging characteristics.

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Pitman, NJ, United States of America

Bernard M Gillespie