Catalytic dewaxing - chemical process removal of wax by selective reaction of long chain n-alkanes (wax).Solvent dewaxing - physical process separation of wax by freezing and solvent transport.Commercial engine oils and other commercial lube oils are formulated with chemical additives that would enhance the performance of the base stocks. Thermal Stability – High thermal stability (or small degree of thermal degradation at high temperatures) is necessary to minimize viscosity loss and coke deposition on metal surfaces.Īll of these properties depend on the molecular composition of the hydrocarbons constituting the lubricating oil base stocks.HVI ensures that the lube oil functions well at both cold start and at high temperatures generated by the engines. EP-A-180354 describes the simultaneous catalytic dewaxing, denitrogenation and desulphurization of a vacuum gas oil by making use of a catalyst composition. Viscosity Index (change in viscosity with temperature) – small change in viscosity is desired over a wide temperature oil, i.e., high viscosity index (HVI).Low viscosity may not provide the required lubrication and lead to high friction between metal parts. Viscosity– important to control because of lubrication and heat transfer considerations.Volatility – should be low to keep oil in the liquid phase during engine operation.In addition to low pour points, other important properties of lube oil base stocks include: Semih Eser © Penn State is licensed under CC BY-NC-SA 4.0
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