Exxon Research and Engineering Company

John M MacDonald

Ian A Cody

Glen P Hamner

Donald T Eadie

Gerald A MacAlpine

Robert Kartzmark

Peter G Wright

A method is described for rendering total liquid product hydroisomerates daylight stable and improving their oxidation stability, which method involves treating the hydroisomerate total liquid product with a Group VIII metal on refractory metal oxide catalyst or Group VIII metal on halogenated refractory metal oxide catalyst under mild conditions, which conditions are a temperature in the range of 170.degree. to 270.degree. C., a pressure in the range of 300 to 1500 psi H.sub.2, 0.25 to 10 v/v/hr and 500 to 10,000 SCF/B,H.sub.2.

Method for stabilizing hydroisomerates

A hydrocarbon composition such as a lubricating or specialty oil containing a selected heteroaromatic nitrogen compound as an antioxidant/metal deactivator/electrical insulator having the following general formula: ##STR1## wherein each X is C or N with at least one X being N; Y is C or N; R is H or CH.sub.2 NR''.sub.2 where each R' is H or alkyl of 1 to 20 carbons; R' is H, SR'' OR '' or NR''.sub.2 with each R'' being H or alkyl of 1 to 20 carbons.

Selected heteroaromatic nitrogen compounds as antioxidant/metal

Process for the preparation of low pour point lubricating oils comprising:

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Sarnia, Canada

John M MacDonald