Chemical process for recycling polyethylene terephthalate...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 51/02 (2006.01) C07C 63/26 (2006.01)

Patent

CA 2595393

The invention relates to a method for chemically recycling PET wastes involving a saponification reaction stage wherein the PET waste particles react with stoichiometric or overstoichiometric amounts of a metal strong base in an alcohol reaction medium, said reaction being carried out at the boiling point thereof and, preferably at atmospheric pressure, thereby obtaining a reaction product in the form a terephthalic acid salt, a base metal and an ethylene glycol incorporated into the alcohol reaction medium. Said invention makes it possible to obtain, by means of said reaction, the ethylene glycol, terephthalic acid and the salts thereof which are very high commercial value products.

L'invention concerne un procédé de recyclage chimique de déchets de PET qui comprend entre autres étapes, une étape de réaction de saponification, dans laquelle on fait réagir des particules de déchets de PET avec des quantités stoechiométriques ou des quantités d'excédent d'une base forte d'un métal dans un milieu de réaction alcoolique, la réaction étant réalisée à la température d'ébullition du milieu alcoolique et, de préférence, à la pression atmosphérique, obtenant, comme produits de réaction, un sel d'acide téréphtalique et le métal de la base et l'éthylèneglcyol ajouté au milieu de réaction alcoolique. Il est possible, à partir de cette réaction, d'obtenir de l'éthylèneglcyol, de l'acide téréphtalique et des sels de celui-ci, qui sont des produits d'une haute valeur commerciale.

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