A process for the purification of caprolactam obtained from...

C - Chemistry – Metallurgy – 07 – D

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C07D 201/12 (2006.01) C07C 201/16 (2006.01)

Patent

CA 2302787

The present invention provides a process for the preparation of purified caprolactam comprising the steps of: (a) depolymerizing polyamide-containing carpet in the presence of steam to obtain crude caprolactam and steam; (b) removing substantially all of said water from said crude caprolactam and steam; (c) distilling the resulting concentrated crude caprolactam at a pressure of less than about 8 mmHg and a temperature from about 110 °C to about 145 °C so as to form overheads and bottoms of the caprolactam; and (d) crystallizing the caprolactam overheads to obtain caprolactam crystals and mother liquor. The resulting purified caprolactam may then be used to make polycaprolactam which may then be used in engineered materials or spun into fiber.

L'invention concerne un procédé de préparation de caprolactame purifié, comprenant les étapes consistant: (a) à dépolymériser un tapis contenant une matière polyamide, en présence de vapeur, afin d'obtenir du caprolactame brut et de la vapeur; (b) à enlever sensiblement toute l'eau à partir du caprolactame brut et de la vapeur; (c) à distiller le caprolactame brut concentré résultant, à une pression inférieure à environ 8 mmHg et à une température comprise entre 100 et 145 DEG C, de façon à former des têtes et des queues de distillation de caprolactame; et (d) à cristalliser les têtes de distillation de caprolactame afin d'obtenir des cristaux de caprolactame et une liqueur mère. On peut alors utiliser le caprolactame purifié résultant, afin de fabriquer du polycaprolactame que l'on peut ensuite employer dans des matériaux façonnés, ou que l'on peut filer pour obtenir des fibres.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

A process for the purification of caprolactam obtained from... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with A process for the purification of caprolactam obtained from..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A process for the purification of caprolactam obtained from... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1908212

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.