Oxidation process to produce a crude and/or purified carboxylic acid product

A process for producing a carboxylic acid composition, said process comprising:

• oxidizing in a primary oxidation zone at least one oxidizable compound in an oxidizable raw material stream comprising at least one selected from the group consisting of 5-HMF esters (5-R(CO)OCH2-furfural where R=alkyl, cycloalkyl and aryl), and 5-HMF ethers (5-R′OCH2-furfural, where R′=alkyl, cycloalkyl and aryl), in the presence of a solvent stream comprising acetic acid, an oxidizing gas comprising oxygen, and a catalyst system at a temperature of about 110° C. to about 160° C. to produce said carboxylic acid composition comprising furandicarboxylic acid at a yield of 80% or more;
• wherein sad primary oxidation zone comprises at least one oxidation reactor and wherein said catalyst system comprises cobalt in a range from about 500 ppm by weight to about 6000 ppm by weight with respect to the weight of the liquid in the primary oxidation zone, manganese in an amount ranging from about 2 ppm n by weight 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 by weight to about 4500 ppm by weight with respect to the weight of the liquid in the primary oxidation zone wherein said carboxylic acid composition has a b* value less than 15.