Permanganate method for manufacture of furan-2,5-dicarboxylic acid

Furan-2,5-dicarboxylic acid was synthesized through oxidation of 5-hydroxymethyl-furfural by potassium permanganate.The influence of the reaction conditions,such as the sodium hydroxide concentration in the reaction system,the reactant/permanganate ratio,and the reaction time,on the yield of furan-2,5-dicarboxylic acid,was investigated.The test results showed that the optimal reaction conditions were realized in an acidic condition,when the sodium hydroxide concentration in the reaction system was 2.2 mol/L,the reactant/permanganate ratio was 2.4∶1,and the reaction time was 10 min,with the product yield reaching 76.3%.This method for producing furan-2,5-dicarboxylic acid using potassium permanganate can be carried out under mild conditions,without employing an expensive catalyst.