| 摘要 |
Scrap foam of flexible or semi-rigid polyurethane is pyrolized at 450 DEG -800 DEG C., preferably 600 DEG 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.
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