Summary: For the production of ML-grade motor oil, mildly solvent extracted and dewaxed motor oil fractions, obtained from Persian Gulf crude, were hydrogen-treated with CoMo (sulfide)/alumina catalyst under various treating conditions. A bench-scale pilot plant containing 200ml of the catalyst was used for the hydrogen-treatment. General properties, oxidation stability and engine performance of the hydrogen-treated oils were compared with those of acid/clay-treated oils.Hydrogen-treated oils obtained under relatively severe treating conditions showed favorable properties in color and viscosity index. They showed, however, inferior oxidation stability and poor engine performance, and also their viscosity was decreased.On the other hand, hydrogen-treated oils obtained under relatively mild treating conditions showed good oxidation stability and good engine performance. General properties, oxidation stability and engine performance of these oils were almost the same with those of acid/clay-treated oils.
Paraffinic distillate lubricating oil fractions-a spindle oil fraction, a machine oil fraction, a solvent-extracted turbine oil fraction, and two kinds of solvent-extracted motor oil fractions different in the severities of solvent extraction-from Persian Gulf crude were hydrogen-treated, over a CoMo-sulfide/alumina catalyst, under hydrogen pressures. Bench-scale pilot plants were used for the hydrogen-treatment. Hydrogen-treated lubricating oils having favorable general propertiese. g., color, viscosity index, aniline point, sulfur content, and nitrogen content-were obtained by the treatment under relatively severe conditions. General properties of these oils were better than those of acid/clay-treated oils. Under the severe treating conditions, however, viscosity of the hydrgentreated oils was slightly reduced, and their oxidation stability was decreased. On the other hand, hydrogen-treated oils having good oxidation stability were obtained by the treatment under relatively mild conditions. The oxidation stability of these oils was almost the same with that of acid/claytreated oils. And the general properties of the product oils obtained by these mild hydrogen-treatment were also almost equal to those of acid/clay-treated oils.
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