Liquid phase oxidation of cyclohexanone to adipic acid by air in acetic acid solution

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Abstract
The liquid phase oxidation of cyclohexanone to adipic acid by air in the presence of acetic acid as a solvent and cobalt acetate or manganese acetate as a catalyst was investigated at a temperature of 60 to 100 °C, and at essentially atmospheric pressure. Succinic acid and glutaric acid were the major by‐products. Under the most suitable set of conditions (cyclohexanone, 1.2 M; cobalt acetate, 7 × 10−3 M; superficial air velocity, 2.5 cm/s, temperature, 80 °C; period of reaction, 5 h), the overall conversion of cyclohexanone was 61 % and the yield of adipic acid and diabasic acids was 69.3% and 85.6% respectively.

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