Recovery of polyester from contaminated polyester waste

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 11/08 (2006.01)

Patent

CA 2284999

A process for recovering a polyester, preferably polyethylene terephthalate, from contaminated polyester waste containing non-polyester components, such as polyester blended with cotton or other fibers in fabric or fiber forms, polyester magnetic tapes, coated polyester films and engineering resins, by dissolving the polyester in molten dimethylterephthalate, methyl-p-toluate or dimethylisophthalate as solvent and separating the polyester solution from the non-polyester components. The polyester can subsequently be recovered by crystallization or the polyester solution can be used as a feedstock for methanolysis to form dimethylterephthalate (DMT) and alkylene glycol. The DMT can be subsequently hydrolyzed to recover terephthalic acid (TPA).

On décrit un procédé de récupération d'un polyester, de préférence du téréphtalate de polyéthylène, à partir de déchets contaminés de polyester contenant des éléments non polyester, tels que des polyesters mélangés avec du coton ou d'autres fibres sous forme de tissus ou autres, des bandes magnétiques en polyester, des films de polyester enduits ou des résines industrielles. Le procédé consiste à dissoudre le polyester dans un diméthyltéréphtalate fondu, un p-toluate de méthyle fondu ou un diméthylisophtalate fondu, utilisé comme solvant, puis à séparer la solution de polyester des éléments non polyester. Le polyester peut ensuite être récupéré par cristallisation, ou la solution de polyester peut être utilisée comme charge d'alimentation pour une méthanolyse destinée à former un diméthyltéréphtalate (DMT) ou un alkylène glycol. Le diméthyltéréphtalate peut ensuite être hydrolisé en vue d'une récupération d'acide téréphtalique (TPA).

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