Study On Novel Technology Of Cyclohexane Oxidation To Cyclohexanone

Cyclohexanone is an important intermediate in synthesizing caprolactam adipic acid andε-caprolactone as well as an important solvent of coating and inks. Domestic cumulative production is above 600000 tons per year. Almost 90% of total is produced with auto-oxidation of cyclohexane without catalyst,but high energy consumption and much more lye drains are its faults. The oxidation experiment was performed in a 1L high-pressure reactor, using cyclohexane as raw material, air as oxygen resource. The protective actions of ethandiol to carbonyl group, the stabilization of sodium carbonate to cyclohexyl hydroperoxide and the catalysis of molybdophoaphoric acid to reaction were investigated. The results showed that though ethandiol could react with cyclohexanone into ethylene ketal under the embient condition,there was no obvious protective roles to carbonyl group of cyclohexanone because of slow reaction speed;that sodium carbonate can stabilize cyclohexyl hydroperoxide well and improve the selectivity of cyclohexane oxidation, but restrain the reaction speed, the optimal conditions were as followed: reaction temperature 160℃, pressure 1.0MPa, 0.2g sodium carbonate, the selectivity was above 92% as the conversion rate of cyclohexane was 4%; The quicken,such as molybdophoaphoric acid, can catalysize the oxidation reaction of cyclohexane well,improve the reaction speed and the selectivity of cyclohexane oxidation, the optimal conditions were as followed: reaction temperature 158℃, pressure 1.0MPa, 0.012g molybdophoaphoric acid, the selectivity was above 92.5% as the conversion rate of cyclohexane was 4.15%, concentation of cyclohexyl hydroperoxide in oxidation products under using molybdophoaphoric acid as a catalyst was below 60%, thus, it decreased consumption of sodium hydrate during cyclohexyl hydroperoxide decomposing,therefore, meanwhile decreased lye drains, this technology of cyclohexane oxidation using molybdophoaphoric acid as a catalyst is the most economic one in these technologys. It has a high selectivity, less lye drains, a freindly environment and a good future in industry.