METHOD FOR PRODUCING A HIGH-PURITY AQUEOUS 5-HYDROXYMETHYLFURFURAL (5-HMF) SOLUTION

The invention relates to a method for producing an aqueous 5-hydroxymethylfurfural (5-HMF) solution, comprising: - a step a) of bringing a feed containing 5-HMF and dimethyl sulfoxide (DMSO) into contact with an intermediate aqueous back-extract from step c) in order to obtain an aqueous mixture, - a step b) of liquid-liquid extraction of the aqueous mixture by a stream of extraction solvent in order to produce an aqueous raffinate and an intermediate organic extract, - a step c) of backwashing the intermediate organic extract with an aqueous solvent in order to produce the intermediate aqueous back-extract and an organic raffinate, and - a step d) of liquid-liquid back-extraction of the organic raffinate obtained at the end of step c) by an aqueous stream in order to produce an organic effluent and an aqueous back-extract of 5-HMF.