Effect of hydroprocessing on lubricant base stock composition and product performance
- Mobil Research and Development, Paulsboro, NJ (United States)
Conventional lubricant base stock manufacture via solvent refining involves the physical separation of lube molecules while hydroprocessing changes the chemical structures of these molecules. Sulfur, nitrogen, and aromatic compounds are reduced to very low levels, compared to conventional refining. These changes in composition naturally affect product performance. Lube oil oxidation stability is increased but inferior solvency characteristics are apparent. This paper summarizes the effect of hydroprocessing unit configuration (one vs. two stage), hydrogen pressure, and hydrotreating temperature on lube base stock composition (sulfur, nitrogen and aromatics). Base stock aromatic composition, as evaluated by ultraviolet spectroscopy, is related to lube oil oxidation stability in a phenol-based antioxidant formulation. Solvency problems observed for the formulated products can be improved with additive modifications. 8 refs., 8 figs., 7 tabs.
- OSTI ID:
- 186182
- Journal Information:
- Lubrication Engineering, Journal Name: Lubrication Engineering Journal Issue: 8 Vol. 50; ISSN LUENAG; ISSN 0024-7154
- Country of Publication:
- United States
- Language:
- English
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