Title: Sodium tungstate/1,2,3,4-butanetetracarboxylic acid catalytic oxidation of cyclohexene to adipic acid
Abstract: Without organic solvent and phase transfer catalyst,the catalytic oxidation of cyclohexene to adipic acid with aquous 30 percent hydrogen peroxide can be performed in the presence of a sodium tungstate?-1,2,3,4-butanetetracarboxylic acid-hydrogen peroxide complex catalyst.The effects of the amount of 1,2,3,4-butanetetracarboxylic acid,reaction temperature,and reaction time on the oxidation reaction are investigated.After the reactants are heated at 70~90?℃ for 8?h with the molar ratio of 1,2,3,4-butanetetracarboxylic acid:sodium tungstate which is 4∶1,in which the molar ratio of sodium tungstate:cyclohexene:hydrogen peroxide is 1∶40∶176,it is observed that the most excellent isolated yield of adipic acid is up to 85.1%.Sodium tungstate/1,2,3,4-butanetetracarboxylic acid catalyst can be reused five times and the isolated yield of adipic acid is still 80.4% (refluxing temperature) and 80.2% (controlling temperature in water bath at 70~90?℃) in the fifth time.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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