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Solvent oil is one of the five categoriesof petroleum products and use widely. The is paint solvent oil ( paint solvent oil), and then edible oil, printingink, leather, pesticides, pesticides, rubber, cosmetics, spices, medicine,electronic parts and etc. Up to now, there are about 400-500 kinds of solventson the market, the solvent oils (hydrocarbon solvents, benzene compounds)account for about half.