Citation:
ZHANG Jing-Jinga, HUANG Wu, YI Qing-Feng, ZHOU Wei, LI Xiao-Hu, LIU Xiao-Ping. Synthesis of Adipic Acid by Electro-oxidation of Cyclohexanol[J]. Chinese Journal of Applied Chemistry,
;2008, 25(10): 1171-1175.
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Electro-synthesis of adipic acid from cyclohexanol in alkaline solution was investigated.Before electrolysis,the Ni electrode was activated by voltammetric technique to form NiOOH on its surface.Cyclo-hexanol was first oxidized to cyclohexanone and then to adipic acid on the activated Ni electrode.Orthogonal tests showed that the maximum yield of adipic acid was 42.59% under the optimum conditions of current density of 6×10-3 A/cm2,reaction temperature of 60℃,reaction time of 16 F/mol,and c(NaOH)=1.0 mol/L.Results of the kinetic study on the cyclohexanol oxidation show that the reaction obeys the consecutive reaction mechanism,and the formation of cyclohexanone is a fast step and the formation of adipic acid is a slower and rate-determining step.The corresponding kinetic equations of cycylohexanol oxidation were derived.The proposed kinetic model gave a satisfactory description for the electro-oxidation of cyclohe-xanol in 1 mol/L NaOH.
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Keywords:
- cyclohexanol,
- nickel electrode,
- electro-oxidation,
- cyclohexanone,
- adipic acid
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