Method for recycling vinyl polymer-based articles

Details Method for recycling vinyl polymer-based articles Method for recycling vinyl polymer-based articles

C - Chemistry, Metallurgy

08

J

C08J 11/08 (2006.01)

Patent

CA 2385297

The invention concerns a method for recycling an article based on at least a vinyl chloride or vinylidene chloride polymer, which consists in: a) shredding the articles into fragments having an average dimension of 1 cm to 50 cm in case it should exceed said dimensions; b) contacting the article fragments with an azeotropic or quasi-azeotropic mixture of water and a solvent capable of dissolving the polymer, at a temperature not less than 120 ·C; c) precipitating the polymer dissolved in the solvent by expansion and by injecting water vapour into the resulting solution, thereby further causing the solvent-water azeotrope to be entrained and leaving a mixture essentially consisting of water and solid polymer particles; d) collecting the polymer particles.

Procédé de recyclage d'un article à base d'au moins un polymère du chlorure de vinyle ou du chlorure de vinylidène, selon lequel: a) l'article est déchiqueté en fragments d'une dimension moyenne de 1 cm à 50 cm au cas où il excéderait ces dimensions; b) les fragments d'article sont mis en contact avec un mélange azéotropique ou quasi-azéotropique d'eau et d'un solvant capable de dissoudre le polymère, à une température d'au moins 120 °C; c) on provoque la précipitation du polymère dissous dans le solvant par détente et par injection de vapeur d'eau dans la solution ainsi obtenue, ce qui provoque en outre l'entraînement de l'azéotrope solvant-eau et laisse ainsi subsister un mélange essentiellement constitué d'eau et de particules solides de polymères; d) on recueille les particules de polymères.

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