Method of recovery of terephthalic acid and ethylene glycol...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/09 (2006.01) C07C 27/02 (2006.01) C07C 29/09 (2006.01) C07C 31/20 (2006.01) C07C 63/26 (2006.01)

Patent

CA 2279892

A subject of the invention is the method of recovery of terephthalic acid and ethylene glycol from poly/ethylene terephthalate/wastes. According to the invention poly/ethylene terephthalate/ is heated in an aqueous solution at the temperature from 150 °C to 280 °C with a reagent substance, chosen from the group, comprising bicarbonates of ammonia and alkali metals, ammonium carbamate and urea, which substances are used in amounts not less than a stoechiometric amount.

L'invention concerne un procédé de récupération d'acide téréphtalique et d'éthylèneglycol à partir des déchets en polyéthylène téréphtalate. Selon l'invention, le polyéthylène téréphtalate est chauffé dans une solution aqueuse à des températures de l'ordre de 150 DEG C à 280 DEG C avec une substance réactive sélectionnée dans le groupe constitué de bicarbonates d'ammonium et de métaux alcalins, de carbamate d'ammonium et d'urée, dont les substances sont utilisées dans des proportions supérieures à une proportion stoechiométrique.

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