Organic compounds -- part of the class 532-570 series – Organic compounds – Sulfur containing
Patent
1981-02-23
1982-03-02
Mars, Howard T.
Organic compounds -- part of the class 532-570 series
Organic compounds
Sulfur containing
568613, 521 495, C07C 4101
Patent
active
043179398
ABSTRACT:
Polyol is recovered from polyurethane waste foam and thereafter used to produce high quality new foam. The foam is dissolved in a saturated alcohol, preferably diethylene glycol, having a boiling point between 220.degree. C. and 280.degree. C. at a temperature between 185.degree. C. and 220.degree. C. under a non-oxidizing atmosphere such as nitrogen. Water and an alkali metal hydroxide catalyst, preferably sodium hydroxide, are added to the solution which is then refluxed at a temperature of between about 175.degree. C. and 220.degree. C. still under a non-oxidizing atmosphere until all the carbamates produced during dissolution have been hydrolyzed to amines and alcohol. At least a portion of the solution is subjected to vacuum purification at a temperature below about 230.degree. C. Substantially pure polyol is recovered. Preferably, prior to vacuum distillation, water is removed from the solution.
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Albright Jane
Braslaw Jacob
Gerlock John L.
Ford Motor Company
Mars Howard T.
May Roger L.
Melotik Lorraine S.
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