7/22/2023 0 Comments Mineral oil viscosity index![]() They are removed either by crystallizing the waxes at low temperature, or they can be isomerized to branched alkanes. Long chain alkanes form waxes that precipitate at relatively high temperature. This solvent preferentially dissolves aromatic compounds well, and the aromatic compounds are separated together with the solvent. Aromatic compounds are initially removed by solvent extraction: The distillation cut is mixed with an immiscible solvent such as phenol or furfural. Mineral base oils are first distilled from petroleum, and they comprise the 26-40 carbon fraction. Certain types of motor oils contain more than twenty percent additives. Ĭhemical substances – additives – are added to the base oil in order to meet the quality requirements for the end products in terms of, for example, friction and cleaning properties. By using hydrogenation technology, in which sulfur and aromatics are removed using hydrogen under high pressure, extremely pure base oils can be obtained, which are suitable when quality requirements are particularly stringent. The most common one is a type of paraffinic crude oil, although there are also naphthenic crude oils that create products with better solubility and very good properties at low temperatures. There are large numbers of crude oils all around the world that are used to produce base oils. During the heating process, light and heavy hydrocarbons are separated – the light ones can be refined to make petrol and other fuels, while the heavier ones are suitable for bitumen and base oils. This means that crude oil is heated in order that various distillates can be separated from one another. Whether or not a crude oil is suitable to be made into a base oil is determined by the concentration of base oil molecules as well as how easily these can be extracted.īase oil is produced by means of refining crude oil. One of the most important factors is the liquid’s viscosity at various temperatures. Different products require different compositions and properties in the oil. Base oils are used to manufacture products including lubricating greases, motor oil and metal processing fluids.
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