It is used in the production of plastics, rubber, resins, pharmaceuticals, etc. and the preparation of amides. Valeric anhydride can be oxidized with hydrogen peroxide to obtain glutaric acid. 420ml of distilled water and 221.7g of 30% hydrogen peroxide stirred and mixed, and then added 342g of glutaric anhydride, Chemicalbook stirred vigorously, maintained at 15 °C reaction, added 7.6g of hydrogen peroxide to continue to keep warm for 1 hour, stood for 24h, filtered out crystals, washed with water and dried with infrared lamp to obtain white powder peroxidized to diacid, melting point 89-90 °C (90 °C began to decompose).