Annikki Gmbh

Novolana Gmbh

Gunter Tekautz

Dirk Kirschneck

Walter Linhart

The present invention relates to a process for the production of 2,5-furandicarboxylic acid (FDCA) via oxidation of 5-hydroxymethyl-2-furfural (HMF), said HMF being present in a solution in a high-boiling polar solvent and water. The process is characterized by the combination of &#x2014;a first oxidation step wherein the HMF is at least partly oxidized in said solution to yield a first reaction mixture comprising at least one monoacid selected from the group consisting of -hydroxymethylfuran-2-carboxylic acid (HMFA), 5-formylfuran-2-carboxylic acid (FFCA) and, optionally, FDCA &#x2014;an extraction step after the first oxidation step wherein said high-boiling polar solvent is extracted from said first reaction mixture by means of an extraction solvent, wherein said at least one monoacid remains in an aqueous phase, &#x2014;a second oxidation step wherein said at least one monoacid is oxidized to FDCA.

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Graz, Austria

Gunter Tekautz