Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Reexamination Certificate
2006-06-28
2010-06-01
Choi, Ling-Siu (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
C521S040000, C521S040500, C521S043500, C528S480000, C528S486000, C528S489000, C528S491000, C528S495000
Reexamination Certificate
active
07728047
ABSTRACT:
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.
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Rodriguez, A. et al., “Vapour-Liquid Equilibria of Dimethyl Carbonate With Linear Alcohols and Estimation of Interaction Parameters for the UNIFAC ANS ASOG Method”, Fluid Phase Equilibria, vol. 201, pp. 187-201 (2002).
Ghirardini Maurizio
Lombardini Sergio
Notari Marcello
Rivetti Franco
Choi Ling-Siu
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Polimeri Europa S.p.A.
Tischler Frances
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