Chemical property: white needle crystal. Slightly soluble in hot water, soluble in hot ethanol, ether, benzene and chloroform. It is used as raw material for preparing pesticide chlorothalonil and antiseptic, as well as curing agent for polyurethane resin and epoxy resin. Resorcinol is an intermediate of bactericide chlorothalonil. Uses: Used in the manufacture of plastics, synthetic fibers and pesticide chlorothalonil. The LD50 of mice injected intraperitoneally was 481mg/kg. Uses: Used to make plastics, synthetic fibers, pesticides (chlorothalonil) and epoxy resin curing agent. It is the raw material of pesticide chlorothalonil and antiseptic, and also used to make curing agent of polyurethane resin and epoxy resin. Package: 25kg/plastic woven bag. Storage and transportation: stored in a cool, ventilated and dry place, and transported as general chemicals. The production method is prepared by ammoxidation of m-xylene. The mixed gas consisting of m-xylene, ammonia and air is passed through vanadium catalyst, the reaction temperature is 400-425 ℃, and the contact time is 3.1s. The purity of m-phthalonitrile was more than 91%, and the yield was more than 93%.