2006•China Tungsten IndustryRequires access
Clear Oxidation of Cyclohexanone to adipic Acid with H_2O_2 Using H_3PW_6Mo_6O_(40)·nH_2O as Catalyst
XU Chang-long
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Abstract
A Keggin structure heteropoly acid H3PW6Mo6O40·nH2O was prepared and used to catalyze the synthesis of adipic acid from cycolhexanone,oxidized by 30% hydrogen peroxide without any organic solvent or phase-transfer agent.This paper studies the effects of amount of catalyst,amount of 30% H2O2,reaction temperature,reaction time.It shows that the optimal conditions of reaction are reactant molar ratio of cyclohexanone/tungstomolybdophosphate acid/hydrogen peroxide= 100/0.15/400,the reaction temperature of 90℃ and time of 5h,the isolated yield of adipic acid can reach 75.8%.