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1. WO2004096890 - PROCEDE PERMETTANT DE DIMINUER LE CAPROLACTAME ET LES OLIGOMERES DE CELUI-CI DANS UN PREPOLYMERE DU NYLON-6

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims
What is claimed is:

1. A process for removing caprolactam and its oligomers from a pre-polymer mixture comprising
caprolactam, oligomers of caprolactam, and nylon-6 pre-polymer, said process comprising:
(a) subjecting the pre-polymer mixture in a molten state to a sudden pressure drop discharge;
(b) contacting the discharged pre-polymer mixture from step (a) with water to produce a pre- polymer phase and a water phase for a time
sufficient for at least a portion of caprolactam and oligomers to be extracted into the water
phase, and
(c) separating the pre-polymer phase from the water phase.

2. The process of claim 1 wherein the pre-polymer discharge from step (a) is allowed to solidify prior to contacting the water in step (b) .

3. Process according to claims 1 and 2 wherein the time that the solidified polymer mixture is in contact with water does not exceed about 60 minutes.

4. Process according to claim 1 wherein the pressure drop in step (a) is at least about 50 psi.

5. Process according to claim 1 wherein the temperature of the water used in step (b) is from about 10SC to about 50 aC.

6. Process according to claim 1 wherein pressure drop discharge in step (a) is accomplished through a nozzle.