Producing 2,5-furandicarboxylic acid with recovery of acid

Abstract

Process for producing 2,5-furandicarboxylic acid comprising the steps of: a) oxidizing feed comprising 5-methylfurfural using an oxidizing gas at a temperature in the range of 150 to 210° C. to obtain a crude carboxylic acid composition comprising 2,5-furandicarboxylic acid, and a catalyst system comprising cobalt, manganese and bromine; b) separating solid 2,5-furandicarboxylic acid from the crude carboxylic acid composition in a solid-liquid separation zone to obtain a solid cake and mother liquor; and c) treating the cake with solvent selected from the group consisting of water and mono- and/or dicarboxylic acids containing of from 1 to 3 carbon atoms to obtain a treated cake and solvent having increased organic acid content which solvent having increased organic acid content comprises 5-bromo-2-furancarboxylic acid and wherein at least part of the solvent having increased organic acid content is added to step a).

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