Method and apparatus for reclamation of waste polyvinyl chloride

Details Method and apparatus for reclamation of waste polyvinyl chloride Method and apparatus for reclamation of waste polyvinyl chloride

1995-08-31

1997-10-07

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

521 425, 524592, 4289033, 422901, C08J 1108, B08B 308

Patent

active

056749147

ABSTRACT:
A method of reclaiming waste polyvinyl chloride according to the present invention includes the steps of bringing industrial waste containing polyvinyl chloride into contact with a solvent in which polyvinyl chloride can be dissolved, to remove polyvinyl chloride from the industrial waste, removing substances which cannot be dissolved in the solvent from a polyvinyl chloride solution consisting of the solvent and the polyvinyl dissolved therein, and recovering reclaimed polyvinyl chloride as a substance left over when the solvent is removed from the polyvinyl solution. The industrial waste to be reclaimed includes polyvinyl chips obtained from waste electric wires, polyvinyl chloride-impregnated wallpaper and used agricultural polyvinyl chloride sheets. The solvent used in the present invention consists of at least one kind of organic solvent selected from the group composed of methyl ethyl ketone, methyl isobutyl ketone and dioctyl phthalate.

REFERENCES:
patent: 3666691 (1972-05-01), Spiller
patent: 3836486 (1974-09-01), Hafner
patent: 3912664 (1975-10-01), Wainer
patent: 3975208 (1976-08-01), Tate et al.
patent: 4038219 (1977-07-01), Boehm et al.
patent: 4071479 (1978-01-01), Broyde et al.
patent: 4596603 (1986-06-01), Pellegrin et al.

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