FIELD: chemistry.
SUBSTANCE: invention relates to three embodiments of a method of purifying a crude composition containing 2,5-furandicarboxylic acid dimethyl ester (FDME). According to one embodiment, the method includes: dissolving the crude composition in a solvent other than methanol to form a solution of the crude composition and crystallising the purified composition from the solution of the crude composition, in which the FDME content is increased compared to the crude composition. Other improvements in crystallisation consist in the use of techniques such as liquid extraction and pretreatment of the crystallisation solution by bringing it into contact with a solid medium.
EFFECT: use of the invention enables to obtain the desired compounds with high purity.
17 cl, 3 tbl, 5 ex
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