C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 63/26 (2006.01) C07C 51/09 (2006.01)
Patent
CA 2173987
Technology for recycling polymers, such as polyethylene terephthalate (PET), is increasingly important in reducing the amount of polymeric materials deposited in landfills. The invention employs a base hydrolysis process to depolymerize, e.g. PET, which is improved by the addition of an oxidation step (preferably aeration) to oxidize impurities to highly insoluble impurities which may be removed by filtration, and may be further improved by the use of a quaternary hydroxide or a nonionic surfactant in the hydrolysis stage.
La technologie du recyclage de polymères tels que le polyéthylène téréphtalate (PET) revêt de plus en plus d'importance si l'on considère la quantité de matériaux polymères déposés dans les décharges et qu'il faut recycler. L'invention utilise un procédé de base consistant à hydrolyser, par exemple le polyéthylène téréphtalate, pour le dépolymériser, ce procédé étant amélioré par l'addition d'une étape d'oxydation (de préférence d'aération) afin d'oxyder les impuretés en impuretés hautement insolubles que l'on enlève ensuite par filtration; on améliore encore ledit procédé en utilisant un hydroxyde d'ammonium quaternaire ou un tensioactif non ionique dans l'étape de l'hydrolyse.
Shell Canada Limited
Smart & Biggar
LandOfFree
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