Purification method of 2, 5-furandicarboxylic acid

The invention relates to the technical field of purification of 2, 5-furandicarboxylic acid, and discloses a purification method of 2, 5-furandicarboxylic acid, which comprises the following steps: (1) in the presence of an organic solvent and water, contacting a 2, 5-furandicarboxylic acid raw material containing 5-formyl-furan-2-formic acid impurities, hydrogen and a catalyst for hydrogenation reaction; (2) carrying out solid-liquid separation and washing on the product obtained in the step (1); wherein the catalyst is a carbon-coated nickel nano composite material, the carbon-coated nickel nano composite material has a core-shell structure comprising a shell layer and an inner core, the shell layer is a graphitized carbon layer, the inner core is nickel nanoparticles, and the nickel nanoparticles comprise a face-centered cubic lattice structure and/or a hexagonal compact lattice structure. According to the method, the 5-formyl-furan-2-formic acid impurity can be efficiently removed, and the product purity