METHOD FOR PRODUCING PURIFIED DIALKYL-FURAN-2,5-DICARBOXYLATE BY PHYSICAL SEPARATION AND SOLID LIQUID SEPARATION

摘要

A process to produce a purified dimethyl-furan-2,5-dicarboxylate (DMFD) by feeding furan dicarboxylic acid and methanol to an esterification zone to generate a crude diester composition, and purifying the crude diester composition with a physical separation process followed by crystallization, solid liquid separation, and optionally drying to produce a purified DMFD composition. A portion of the stream generated by solid liquid separation can be dissolved and subjected to crystallization and solid liquid separation repeatedly. The process is useful to produce a purified DMFD composition having a low b*, at least 98 wt. % DAFD solids, and a low concentration of 5-(methoxycarbonyl)furan-2-carboxylic acid (MCFC) and methyl 5-formylfuran-2-carboxylate (MFFC).

主权项

1. A dialkyl furan dicarboxylate (DAFD) composition, comprising:
(i) at least 98 wt. % solids based on the weight of the composition, said solids comprising DAFD in an amount of greater than 98 wt. % based on the weight of the solids, (ii) a b* of 5 or less, (iii) not more than 3 wt. % 5-(alkoxycarbonyl)furan-2-carboxylic acid (ACFC), (iv) not more than 3 wt. % alkyl 5-formylfuran-2-carboxylate (AFFC), and (v) not more than 1 wt. % FDCA.