Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1981-02-23
1982-02-23
Mars, Howard T.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
260 23, 568613, C07C 4311
Patent
active
043169929
ABSTRACT:
Polyol is recovered from polyether based polyurethane foam by a process which includes reacting the foam with an alcohol, preferably a glycol ether, whose boiling point is between 225.degree. C. and 280.degree. C. at a temperature between 185.degree. C. and 220.degree. C. under a non-oxidizing atmosphere. Thereafter, superheated steam is bubbled through the solution to hydrolyze substantially all the carbamate produced during dissolution to amines and alcohols, preferably in the presence of sodium hydroxide. During hydrolysis, the temperature of the solution is maintained at between 185.degree. C. and 220.degree. C. and the solution volume is maintained by adding alcohol to replace that removed by the steam. At least a portion of the solution is subjected to vacuum purification at a temperature below about 230.degree. C. The portion of the solution subjected to vacuum purification may be the polyol layer which forms after the hydrolyzed solution has been allowed to stand. Substantially pure polyol is recovered.
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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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