![]() ![]() The viscosity of aromatic components in a base oil also responds relatively poorly to changes in temperature. Oxidation of aromatics can start a chain reaction that can dramatically shorten the useful life of a base oil. Aromatics make good solvents but they make poor quality base oils because they are among the most reactive components in the natural lube boiling range. Remove wax by chilling and precipitation in the presence of a different solvent.Īromatics are removed by solvent extraction to improve the lubricating quality of the oil.Remove aromatics by solvent extraction.The solvents and hardware used to manufacture solvent-refined base oils have changed over time, but the basic strategy has not changed since 1930. Solvent refined base oils are commonly called Group I base oils which are characterized as those having less than 90% saturates (>10% aromatics) and more than 300 ppm sulfur. In the past, two-thirds of the base oil in North America were manufactured using solvent refining. In order to set the stage, let us first review the basic API Groups of base oils and discuss their basic refining and crude oil processing techniques. However, conventional mineral oils composed of Group II oils, using the latest refining and extraction techniques, offer advantages not seen in oils from the 1940’s through the 1970’s. Un-additized mineral oils may be good for general purpose use, but are not optimized for any performance feature. Mineral oils contain many classes of chemical components including aromatics, paraffins, naphthenes, sulfur and nitrogen species, etc, and its composition is determined primarily by the crude source. Conventional lubricants are formulated based on mineral oils derived from petroleum. ![]()
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