Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1981-02-24
1982-06-22
Mars, Howard T.
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568613, C07C 4101
Patent
active
043364063
ABSTRACT:
Polyol is recovered from polyurethane based polyurethane foam by a process which includes first dissolving the foam in a saturated alcohol, preferably diethylene glycol, having a boiling point between about 225.degree. C. and 280.degree. C. at a temperature between about 185.degree. C. and 220.degree. C. under a non-oxidizing atmosphere. The solution is reacted with water in the presence of an alkali hydroxide catalyst, preferably sodium hydroxide, under a non-oxidizing atmosphere, such as nitrogen. This may be done by refluxing the solution at a temperature between about 175.degree. C. and 220.degree. C. until all the carbamates produced during dissolution have been hydrolyzed to amines and alcohol. Water remaining in solution after hydrolysis is removed. A high boiling alkane is used to extract the polyol from the solution still under a non-oxidizing atmosphere and then the extracted polyol is subjected to vacuum purification at a temperature of less than about 230.degree. C. Substantially pure polyol is recovered which can be used to make new foam.
REFERENCES:
patent: 2973151 (1960-05-01), Broeck et al.
patent: 3109824 (1963-11-01), Heiss
patent: 3117940 (1964-01-01), McElroy
patent: 3123577 (1964-03-01), Heiss
patent: 3300417 (1967-01-01), McElroy
patent: 3404103 (1968-10-01), Matsudaira et al.
patent: 3441616 (1969-04-01), Pizzini et al.
patent: 3632530 (1972-01-01), Kinoshita
patent: 3708440 (1973-01-01), Frulla et al.
patent: 3738946 (1973-06-01), Frulla et al.
patent: 3954681 (1976-05-01), Castle
patent: 3983087 (1976-09-01), Tucker et al.
patent: 4014809 (1977-03-01), Kondo et al.
patent: 4035314 (1977-07-01), Lohr, Jr. et al.
patent: 4039568 (1977-08-01), Sakai et al.
patent: 4110266 (1978-08-01), Sheratte
patent: 4115298 (1978-09-01), Schneider et al.
patent: 4159972 (1979-07-01), Braslaw et al.
patent: 4162995 (1979-07-01), Sheratte
Braslaw Jacob
Gerlock John L.
Stevens William E.
Ford Motor Company
Mars Howard T.
May Roger L.
Melotik Lorraine S.
LandOfFree
Polyol extraction by high boiling alkanes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polyol extraction by high boiling alkanes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polyol extraction by high boiling alkanes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-654185