Nylon extraction from commingled materials

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 11/08 (2006.01)

Patent

CA 2753936

The present invention provides energetically and economically efficient methods for separating polyamide polymer (s) from commingled materials. The methods generally involve precipitating a polyamide polymer dissolved in a solvent (e.g., formic acid) using dimethyl ether (DME) as an antisolvent. The methods comprise dissolving the polyamide polymer in a solvent that (i) selectively dissolves the polyamide polymer relative to the other materials and (ii) has a higher solubility for DME relative to the polyamide polymer; and then contacting the mixture of the solvent with the dissolved polyamide polymer with DME, thereby precipitating the polyamide polymer.

Cette invention concerne des procédés efficaces du point de vue énergétique et économique pour séparer un ou plusieurs polymères de polyamide à partir de matériaux mélangés. Les procédés impliquent généralement la précipitation d'un polyamide dissous dans un solvant (acide formique par exemple) en utilisant de l'éther diméthylique (DME) comme anti-solvant. Les procédés consistent à dissoudre le polyamide dans un solvant (i) qui dissout sélectivement le polyamide par rapport aux autres matériaux et (ii) qui présente une solubilité dans le DME meilleure que le polyamide; puis à mettre en contact le mélange solvant-polyamide dissous avec le DME, ce qui précipite le polyamide.

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