Bis-beta-hydroxyethyl terephthalate production process and...

C - Chemistry – Metallurgy – 07 – C

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C07C 69/82 (2006.01) C07C 67/03 (2006.01) C07C 67/52 (2006.01) C07C 67/54 (2006.01) C07C 67/56 (2006.01) C08G 63/183 (2006.01) C08G 63/82 (2006.01)

Patent

CA 2318761

An aromatic polyester is pre-decomposed by heating together with bis- .beta.-hydroxyethyl terephthalate and/or a low condensate thereof and then, reacted with ethylene glycol to convert the terephthalic acid component of the pre-decomposed product into bis- .beta.-hydroxyethyl terephthalate and/or a low condensate thereof. The thus obtained solution composition, that is, bis- .beta.-hydroxyethyl terephthalate solution composition containing ethylene glycol, bis- .beta.-hydroxyethyl terephthalate and cations and/or anions as impurities is brought into contact with a cation exchanger and/or an anion exchanger to remove rations and anions as impurities to produce bis- .beta.-hydroxyethyl terephthalate having a small content of ions. The bis- .beta.-hydroxyethyl terephthalate-containing mixture having a small content of ions is subjected to preliminary evaporation or distillation to distill off a compound having a boiling point lower than that of bis- .beta.-hydroxyethyl terephthalate and then, to evaporation or distillation under reduced pressure to give purified bis-(3-hydroxyethyl terephthalate. Thus, purified bis- .beta.-hydroxyethyl terephthalate having a ration and anion total content of 15 ppm or less is obtained.

Cette invention concerne un procédé consistant à chauffer un polyester aromatique avec du bis- beta -hydroxyéthyl téréphtalate et/ou de faibles condensats de ce composé en vue d'une pré-décomposition, et de faire réagir le mélange de pré-décomposition avec de l'éthylène glycol pour transformer les composants d'acide téréphtalique contenus dans le mélange en bis- beta -hydroxyéthyl téréphtalate et/ou de faibles condensats de ce produit. L'invention concerne également un procédé consistant à mettre la solution obtenue au moyen du procédé précédent en contact avec un échangeur de cations et/ou un échangeur d'anions pour obtenir un bis- beta -hydroxyéthyl téréphtalate à teneur ionique réduite. L'invention concerne encore un procédé consistant à soumette un bis- beta -hydroxyéthyl téréphtalate renfermant le mélange à teneur ionique réduite à une évaporation ou une distillation préalable pour évacuer les composés à faibles point d'ébullition, puis à soumettre le mélange ainsi obtenu à une évaporation ou une distillation <i>in vacuo </i> pour obtenir du bis- beta -hydroxyéthyl téréphtalate dont teneur totale en cations et en anions est de 15 ppm maximum.

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