Continuous polyamide extraction process

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 69/46 (2006.01) B01D 11/02 (2006.01) C08G 69/04 (2006.01) C08G 69/16 (2006.01)

Patent

CA 2310849

A process is disclosed for continuously extracting polyamide particles from a circulating extraction solution in a vertical extraction column subdivided into two zones. The polyamide is treated in the first zone with an aqueous .epsilon.-caprolactam solution with 40-95 wt. % .epsilon.-caprolactam as extraction agent at 100 to 140 ~C, then subsequently treated with water in the second zone. Finally, the caprolactam can be extracted in a manner known per se. The process allows polyamide with a low dimer content to be economically produced.

L'invention concerne un procédé pour l'extraction en continu de particules de polyamide avec un solvant d'extraction guidé en boucle dans une colonne d'extraction verticale subdivisée en deux zones. On traite le polyamide dans la première zone avec une solution aqueuse d'.epsilon.-caprolactame avec 40 à 95 % en poids d'.epsilon.-caprolactame comme solvant d'extraction, à une température de 100 à 140 ·C, et on le traite ensuite avec de l'eau dans la deuxième zone. Le caprolactame peut ensuite être extrait de manière connue en soi. Ce procédé permet une production économique de polyamide à faible teneur en dimères.

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