Process for the separation of plastics by flotation

Details Process for the separation of plastics by flotation Process for the separation of plastics by flotation

1991-12-20

1993-09-28

Lithgow, Thomas M.

Classifying, separating, and assorting solids

Fluid suspension

Liquid

209167, 209 11, 241DIG38, 521 465, 521 48, 521 485, B03D 102, B03D 1002

Patent

active

052480410

ABSTRACT:
The invention relates to a process for separating off polyester plastics from a mixture of polyester, polyvinyl chloride and, if present, other plastics, wherein in the flotation the polyester remains as the residue and the polyvinyl chloride and, if present, other plastics are recovered in floated form, which comprises treating the mixture of plastics with an aqueous alkaline solution and separating off the polyester from polyvinyl chloride and, if present, other plastics by flotation.

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Bahr, A., Erzmetall 33:324-330 (1980)-No Translation.
Modern Plastics:pp. 15-22 (Jun. 1990).
E. Sisson et al, "Selective Surfactant (Froth) Flotation of Plastics", Goodyear Tire & Rubber Co., Davos Recycle '92 International Forum, Davos, Switzerland, Apr. 7-10, 1992, pp. 2/4-1 to 2/4-17.

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