Adipic acid (AA) is one of most important aliphatic dicarboxylic acids with wide application, which is mainly used in the manufacture of nylon-66with increasing demand worldwide year by year. Currently,two-step cyclohexane oxidation is the primary process for adipic acid industrial production. Cyclohexane is firstly oxidized into cyclohexanol and cyclohexanone mixture (KA oil) by air, and then KA oil is oxidized into adipic acid by nitric acid. High conversion and selectivity are achieved by KA oil oxidatio...