C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 11/08 (2006.01) C08J 3/09 (2006.01)
Patent
CA 2533607
The invention relates to the use of dialkyl carbonates as solvents for expanded polystyrene and to a new process for the recycling of expanded polystyrene. Said process comprises the volume reduction of expanded polystyrene by dissolution with a dialkyl carbonate, or a blend of dialkyl carbonates, the removal of the insoluble components by filtration, the selective precipitation of polystyrene with a non-solvent or a blend of non- solvents, the separation, drying and extrusion of the precipitated polystyrene. This process allows the recovery of pure polystyrene without altering its properties.
L'invention concerne l'utilisation de carbonates de dialkyle en tant que solvants pour le polystyrène expansé et un nouveau procédé de recyclage du polystyrène expansé. Ledit procédé consiste à réduire le volume du polystyrène expansé par dissolution avec un carbonate de dialkyle ou un mélange de carbonates de dialkyle, à éliminer les composants insolubles par filtration, à précipiter sélectivement le polystyrène avec un non-solvant ou un mélange de non-solvants, à séparer, à sécher et à extruder le polystyrène précipité. Ce procédé permet de récupérer le polystyrène pur sans en modifier les propriétés.
Notari Marcello
Rivetti Franco
Polimeri Europa S.p.a.
Robic
LandOfFree
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