Organic compounds -- part of the class 532-570 series – Organic compounds – Unsubstituted hydrocarbyl chain between the ring and the -c-...
Reexamination Certificate
2007-02-06
2007-02-06
Kifle, Bruck (Department: 1624)
Organic compounds -- part of the class 532-570 series
Organic compounds
Unsubstituted hydrocarbyl chain between the ring and the -c-...
Reexamination Certificate
active
10457831
ABSTRACT:
This invention relates to a continuous and efficient method for the manufacture of highly pure caprolactam suitable for the polycondensation of Polyamide 6 (polycaprolactam) from polyamide waste. In particular the invention relates to a method for the manufacture of caprolactam from waste containing polyamides, including the steps a) depolymerisation of the waste containing polyamides, whereby a caprolactam raw material and a flow containing secondary constituents or additives is obtained, b) at least one distillation of the caprolactam raw material, and c) at least one crystallisation of the caprolactam material obtained in step b), by which means caprolactam is obtained, whereby at least part of the caprolactam obtained in step c) with a permanganate number of<10000 sec. and a UV transmission of<85% is added to the waste containing polyamides before and/or during the depolymerisation.
REFERENCES:
patent: 2752336 (1956-06-01), Boon et al.
patent: 2813858 (1957-11-01), Joris
patent: 3839324 (1974-10-01), Schultze et al.
patent: 3977952 (1976-08-01), Knoevenagel et al.
patent: 4107160 (1978-08-01), Dicoi et al.
patent: 4148792 (1979-04-01), Danziger et al.
patent: 4605672 (1986-08-01), Toth et al.
patent: 5359062 (1994-10-01), Fuchs et al.
patent: 5598980 (1997-02-01), Dilly-Louis et al.
patent: 5637700 (1997-06-01), Fuchs et al.
patent: 5656757 (1997-08-01), Jenczewski et al.
patent: 5990306 (1999-11-01), Mayer et al.
patent: 6056633 (2000-05-01), Sesena et al.
patent: 6095441 (2000-08-01), Unkelbach et al.
patent: 6111099 (2000-08-01), Frentzen et al.
patent: 6187917 (2001-02-01), Mayer et al.
patent: 6579979 (2003-06-01), Leconte
patent: 2002/0030014 (2002-03-01), Leconte
patent: 887 199 (1953-08-01), None
patent: 889199 (1953-09-01), None
patent: 1105420 (1961-04-01), None
patent: 2408778 (1975-09-01), None
patent: 24 16 573 (1975-10-01), None
patent: 25 07 744 (1976-09-01), None
patent: 19 719 734 (1998-11-01), None
patent: 910 056 (1954-04-01), None
patent: 0 676 394 (1995-10-01), None
patent: 0 681 896 (1995-11-01), None
patent: 0 875 504 (1998-11-01), None
patent: 0 875 505 (1998-11-01), None
patent: 0 876 847 (1998-11-01), None
patent: 142150 (1977-06-01), None
patent: 5313636 (1993-11-01), None
patent: 8099954 (1996-04-01), None
patent: 2000038377 (2000-02-01), None
Brandup, et al., “Die Wiederverwertung von Kunststoffen”, (The Recycling of Plastics), Verlag Carl Hanser Munich, Vienna, 1995, pp. 513-520.
Organikum, Organisch-chemisches Grundpraktikum, Veb Deutscher Verlag der Wissenschaften, Berlin 1988, pp. 54-59.
Born Claus
K{hacek over (a)}mpf Rudolf
Seelig Joachim
Wolf Reinhard
Kifle Bruck
Michael & Best & Friedrich LLP
Zimmer Aktiengesellschaft
LandOfFree
Method for the manufacture of caprolactam from waste... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for the manufacture of caprolactam from waste..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the manufacture of caprolactam from waste... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3883161