Purification of 2.5-furandicarboxylic acid

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Jan-Erik Raitanen

If you already have the 2,5-furandicarboxylate after alkaline hydrolysis, you could just extract with an organic solvent to remove impurities. Then, just acidify the water layer carefully to pH 2-3 with HCl (e.g., 10 %, v/v). Your product should precipitate so just filter it off, dry under vacuum and analyze. Finally confirm by NMR you have the target molecule.

Teodoro S Kaufman

Acidify up to pH 3.4 - 4 with H2SO4 and extract