Process for the recycling of expanded polystyrene

Details Process for the recycling of expanded polystyrene Process for the recycling of expanded polystyrene

C - Chemistry, Metallurgy

08

J

C08J 11/08 (2006.01) C08L 25/06 (2006.01)

Patent

CA 2615848

The invention relates to an enhanced process for the recycling of expanded polystyrene. Said process essentially comprises the reduction in volume of expanded polystyrene by means of dissolution in a solvent, separation of the insoluble components, selective precipitation of the polystyrene with an anti- solvent, separation, drying and extrusion of the precipitated polystyrene, recovery by distillation and recycling of the solvent. The process is characterized in that the anti-solvent is a butanol selected form n-butanol, iso-butanol or sec-butanol and the solvent is dimethyl carbonate, alone or in a mixture containing up to 25% by weight of butanol.

La présente invention se rapporte à un procédé amélioré permettant le recyclage de polystyrène expansé. Ledit procédé consiste essentiellement à réduire le volume d'un polystyrène expansé, par dissolution dans un solvant, séparation des composants insolubles, précipitation sélective du polystyrène à l'aide d'un anti-solvant, séparation, séchage et extrusion du polystyrène précipité, récupération par distillation et recyclage du solvant. Le procédé selon l'invention est caractérisé en ce que l'anti-solvant utilisé est un butanol sélectionné parmi le n-butanol, l'isobutanol ou le sec-butanol, et le solvant utilisé est du carbonate de diméthyle, seul ou contenu dans un mélange renfermant jusqu'à 25 % de butanol.

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