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Mineral oil usually refers to the crude oil (or petroleum) that has been exploited and processed, mineral oil, petroleum is buried underground natural mineral products, after exploration, extraction of unrefined oil is also called crude oil. At ambient temperature, the finished products of [2] crude oil are called petroleum products. According to habit, the base oil extracted from petroleum by physical distillation method is called mineral oil base oil. Refining process is mainly to separate crude oil into different parts to get the desired product. The main separation processes include the distillation and separation of crude oil into crude gasoline, kerosene, diesel oil, heavy diesel oil, various lubricating oil fractions, cracking feed oil and residual oil and the separation of solvents used in the purification of various lubricating oils. The production process is mainly physical process, and does not change the structure of hydrocarbons.