Patent ID: 8791278

Claim:
A process to produce a purified slurry stream comprising furan-2,5-dicarboxylic acid (FDCA), said process comprising: (a) oxidizing in an primary oxidation zone 5-(hydroxymethyl)furfural (5-HMF) in the presence of a solvent stream comprising acetic acid, an oxidizing gas stream comprising oxygen, and a catalyst system to produce a carboxylic acid composition comprising furan-2,5-dicarboxylic acid (FDCA); wherein said catalyst system comprises cobalt in a range from about 500 ppm to about 6000 ppm with respect to the weight of the liquid in the primary oxidation zone, manganese in an amount ranging from about 2 ppm to about 600 ppm by weight with respect to the weight of the liquid in the primary oxidation zone, and bromine in an amount ranging from about 300 ppm to about 4500 ppm by weight with respect to the weight of the liquid in the primary oxidation zone; and wherein the yield of furan-2,5-dicarboxylic acid is greater than 50%; wherein said primary oxidation zone comprises at least on oxidation reactor operated at a temperature between 132° C. to 180° C.; (b) routing said carboxylic acid composition to a liquid displacement zone to produce a displaced mother liquid stream and a low impurity slurry stream; and (c) routing said low impurity slurry stream to a secondary oxidation zone to form a purified slurry stream; wherein said purified slurry stream comprises FDCA.