Separation of contaminants from polyester materials

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 11/04 (2006.01)

Patent

CA 2601201

The present invention is generally directed to a process for separating and recovering post-consumer polyester from various contaminant materials. The invention can be utilized to separate post-consumer polyester from various contaminants including glass, dirt, paper, metal, glue, dye, and the like. The disclosed process includes several stages including a preparation stage, in which a portion of the contaminants can be removed from the polyester, as well as a reaction stage, in which a portion of the polyester can be saponified and contaminants can be physically separated from the polyester. In addition, during the reaction stage, certain hard-to-separate contaminants, such as aluminum and polyvinyl chloride, can react to a form more easily separable from the polyester.

L'invention concerne, d'une manière générale, un procédé qui permet de détacher et de restaurer un polyester après consommation en le débarrassant de divers matériaux contaminants. L'invention permet de débarrasser un polyester après consommation de divers contaminants dont le verre, la poussière, le papier, le métal, la colle, la teinture, etc. Le procédé selon l'invention comporte plusieurs étapes, dont une étape de préparation, au cours de laquelle une partie des contaminants peut être enlevée du polyester, et une étape de réaction, au cours de laquelle une partie du polyester peut être soumise à une saponification et des contaminants peuvent être détachés physiquement du polyester. De plus, pendant l'étape de réaction, certains contaminants difficilement détachables, tels que le chlorure d'aluminium et de polyvinyle, peuvent réagir et prendre une forme plus facilement détachable du polyester.

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