Organic compounds -- part of the class 532-570 series – Organic compounds – Unsubstituted hydrocarbyl chain between the ring and the -c-...
Patent
1995-12-08
1997-10-28
Bond, Robert T.
Organic compounds -- part of the class 532-570 series
Organic compounds
Unsubstituted hydrocarbyl chain between the ring and the -c-...
528323, C07D20112
Patent
active
056819528
ABSTRACT:
The present invention provides an efficient process for the recovery of caprolactam from polycaprolactam-containing waste material. The present process for depolymerizing multi-component waste material comprising polycaprolactam and non-polycaprolactam components to form caprolactam comprises the step of: in the absence of added catalyst, contacting the multi-component waste material with superheated steam at a temperature of about 250.degree. C. to about 400.degree. C. and at a pressure within the range of about 1 atm to about 100 atm and substantially less than the saturated vapor pressure of water at the temperature wherein a caprolactam- containing vapor stream is formed.
The formed caprolactam may then be used in the production of engineered resins and fibers.
REFERENCES:
patent: 3182055 (1965-05-01), Bonfield et al.
patent: 3317519 (1967-05-01), Lazarus et al.
patent: 3939153 (1976-02-01), Fowler
patent: 4107160 (1978-08-01), Dicoi et al.
patent: 4578510 (1986-03-01), Doerr
patent: 4605762 (1986-08-01), Mandoki
patent: 4620032 (1986-10-01), Doerr
patent: 5169870 (1992-12-01), Corbin et al.
patent: 5233037 (1993-08-01), Nielinger et al.
patent: 5241066 (1993-08-01), Davis et al.
patent: 5266694 (1993-11-01), Moran, Jr.
patent: 5294707 (1994-03-01), Kotek
patent: 5310905 (1994-05-01), Moran, Jr.
patent: 5359062 (1994-10-01), Fuchs et al.
patent: 5360905 (1994-11-01), Fuchs et al.
patent: 5455346 (1995-10-01), Kopietz et al.
patent: 5457197 (1995-10-01), Sifniades et al.
patent: 5466346 (1995-11-01), Chou et al.
patent: 5468900 (1995-11-01), Moran, Jr. et al.
patent: 5495014 (1996-02-01), Fuchs et al.
patent: 5495015 (1996-02-01), Bassler et al.
patent: 5536831 (1996-07-01), Kopietz et al.
L.A. Dmitrieva et al., Fiber Chemistry, vol. 17, No. 4, Mar. 1986, pp. 229-241.
Hendrix Jan Agnes Jozef
Levy Alan Bart
Sifniades Stylianos
Allied-Signal Inc.
Bond Robert T.
Brown Melanie L.
DSM N.V.
Rymarz Renee J.
LandOfFree
Process for depolymerizing nylon-containing waste to form caprol does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for depolymerizing nylon-containing waste to form caprol, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for depolymerizing nylon-containing waste to form caprol will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1027237