Method of recovering polyols from scrap polyurethane foam

Details Method of recovering polyols from scrap polyurethane foam Method of recovering polyols from scrap polyurethane foam

1979-04-04

1981-01-06

Lieberman, Allan

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

568868, C07C 2974, C08J 1104

Patent

active

042435609

ABSTRACT:
Scrap foam of flexible or semi-rigid polyurethane is pyrolized at 450.degree.-800.degree. C., preferably 600.degree. C., in the absence of air and of any added reactive agents or catalysts. The residence time may be from 3 minutes to one hour, preferably about 5 minutes. A distillate is obtained comprising an aqueous phase and an organic phase. The latter essentially consists of alcohols and polyols and may be re-used as such for preparing polyurethane resins.

REFERENCES:
patent: 2998395 (1961-08-01), Albert et al.
patent: 3983087 (1976-09-01), Tucker et al.

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