C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 223/10 (2006.01) C07D 201/12 (2006.01)
Patent
CA 2239283
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 °C to about 400 °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.
L'invention concerne un procédé efficace pour récupérer du caprolactame à partir de déchets contenant du polycaprolactame. Ce procédé de dépolymérisation d'un mélange de composants contenant et ne contenant pas de polycaprolactame pour former du caprolactame consiste à: mettre en contact, en absence de catalyseur, les déchets composites avec de la vapeur surchauffée à une température dans la plage allant de 250 DEG C environ à 400 DEG C environ, à une pression dans la plage allant de 1 atmosphère environ à 100 atmosphères environ, la pression de vapeur étant sensiblement inférieure à la pression saturante. On obtient ainsi une vapeur d'eau contenant du caprolactame. Le caprolactame formé peut servir à fabriquer des éléments mécaniques ou des fibres.
Hendrix Jan Agnes Jozef
Levy Alan Bart
Sifniades Stylianos
Alliedsignal Inc.
Dsm N.v.
Gowling Lafleur Henderson Llp
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