25- Process for purifying a crude composition of dialkyl ester of 25-furandicarboxylic acid

摘要

The dialkyl ester of 2,5-furan dicarboxylic acid as a starting dialkyl ester concentration is 90% wt or more and the monoalkyl ester of 2,5-furan dicarboxylic acid as the starting monoalkyl ester concentration Wherein the ester composition based on the weight of the ester composition comprises a purified dialkyl ester composition containing a dialkyl concentration higher than the starting dialkyl ester concentration and a starting dialkyl ester concentration greater than the starting monoalkyl ester concentration Can be purified by a method including melt crystallization of the ester composition to obtain a melt residue containing a high monoalkyl ester concentration. The refined monoalkyl ester composition and contaminant-rich residue from the molten residue can be prepared via melt crystallization. The purified dialkyl ester composition and / or the purified monoalkyl ester composition can be hydrolyzed to obtain a purified 2,5-furan dicarboxylic acid.