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Homotoluene is an important fine chemical raw material, the polymerization of homotoluic anhydride and diamine compounds obtained by oxidation can be made into polyimide engineering plastics with high temperature resistance and good insulation performance, which is an important material for high-tech industries such as microelectronics, aerospace and military industry. Homotoluene can also be used as intermediate of medicine and dye. By-product of  aromatic solvent oil are widely used in pesticides, light industry, machinery industry, naphthalene and methyl naphthalene pesticide, medicine and dye industry is important raw materials.