Process including glycolysis and subsequent purification for...

Details Process including glycolysis and subsequent purification for... Process including glycolysis and subsequent purification for...

C - Chemistry, Metallurgy

08

G

C08G 63/78 (2006.01) C07C 67/02 (2006.01) C07C 67/03 (2006.01) C07C 69/76 (2006.01) C07C 69/82 (2006.01) C08G 63/183 (2006.01) C08J 11/24 (2006.01)

Patent

CA 2239003

A new process is described for recycling polyesters. In accordance with the described process, postconsumer or scrap polyester is reacted with glycol to produce a monomer or low molecular weight oligomer by depolymerization of the polyester. The monomer or oligomer, as the case may be, is then purified using one or more of a number of steps including filtration, crystallization, and optionally adsorbent treatment or evaporation. The monomer or oligomer thus produced is particularly suitable as a raw material for acid or ester based polyester production of packaging grade polyester material. Because the process includes purification steps, specifications for the previously used polyester material need not be strict.

L'invention concerne un nouveau procédé pour le recyclage des polyesters de post-consommation ou de rebuts. On fait réagir ces matériaux avec un glycol pour obtenir par dépolymérisation du polyester un monomère ou bien un oligomère de faibre poids moléculaire. On purifie ensuite le monomère ou l'oligomère selon le cas, en utilisant une ou plusieurs étapes qui comprennent la filtration, la cristallisation et, à titre facultatif, l'adsorption ou l'évaporation. Le monomère ou oligomère résultant est une matière première particulièrement adaptée à la production de polyesters à base d'acide ou d'esters, utilisés dans la fabrication de matériaux d'emballage. Etant donné que des étapes de purification sont prévues dans le procédé, aucune spécification rigoureuse n'est nécessaire pour les matériaux en polyester utilisés au préalable.

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