Oxidation of Cyclohexanol to Adipic Acid Catalyzed by Heteropoly Acid with Aid of Ultrasound

Adipic acid was synthesized under ultrasonic irradiation using cyclohexanol and hydrogen peroxide as raw materials and phosphotungstic acid as a catalyst.The effect of materials ratio,catalyst amount,reaction temperature and time on the yield of adipic acid was studied.The yield of adipic acid reached 82.1% when the amount of cyclohexanol,30% hydrogen peroxide and catalyst were 10.5 mL,60 mL and 0.5 mmol,respectively,the reaction temperature was 75(°C) and the reaction time was 8 h.The yield of this method was higher than in ordinary method(60%～70%).This is a feasible and green chemical process to synthesize adipic acid.