Polyester precursor purification process

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/78 (2006.01) C07C 67/60 (2006.01) C07C 69/82 (2006.01) C08G 63/82 (2006.01)

Patent

CA 2419422

Disclosed is a process for the purification of a polyester precursor wherein a polyester oligomer derived from terephthalic acid and one or more glycols or diols is purified or decolorized by hydrogenating the oligomer to convert colored impurities to colorless compounds and the thereby improve the color of the oligomer. The colored impurities are present in the terephthalic acid used to prepare the oligomers and are formed during the manufacture of terephtalic acid. The purified/decolorized oligomer obtained from the disclosed process may be used to prepare high molecular weight polyesters.

Procédé de purification d'un précurseur de polyester, selon lequel un oligomère de polyester dérivé d'acide téréphtalique et d'un ou plusieurs glycols ou diols est purifié ou décoloré par hydrogénation de l'oligomère pour convertir des impuretés colorées en composés incolores et, partant, améliorer la couleur de l'oligomère. Les impuretés colorées sont présentes dans l'acide téréphtalique utilisé pour préparer les oligomères et sont formées pendant la fabrication de l'acide téréphtalique. L'oligomère purifié / décoloré obtenu à l'aide du procédé selon la présente invention peut être utilisé pour préparer des polyesters de poids moléculaire élevé.

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