Adiponitrile is a precursor of polymer nylon 66. Adiponitrile is mainly used in the production of polyamide fiber intermediate hexamethylene diamine, rubber accelerator and rust inhibitor. It is also used as detergent additive, spinning solution of ternary copolymer of acrylonitrile, methacrylonitrile and methyl methacrylate, solvent for wet spinning and dry spinning of PVC fiber, colorant of polyamide, auxiliary agent of fabric bleaching agent, acetate, propionate Butyrate and mixed ester plasticizer; And as an extractant for aromatic extraction.