Recovery of .epsilon.-caprolactam from aqueous mixtures

Details Recovery of .epsilon.-caprolactam from aqueous mixtures Recovery of .epsilon.-caprolactam from aqueous mixtures

C - Chemistry, Metallurgy

07

D

C07D 223/10 (2006.01) C07D 201/08 (2006.01) C07D 201/16 (2006.01)

Patent

CA 2246459

Process to separate .epsilon.-caprolactam from an aqueous mixture containing .epsilon.-caprolactam and at least 0.5 wt.% oligomers, wherein the separation is performed by extraction using an organic extraction agent. The aqueous mixture may be obtained in a process to prepare .epsilon.-caprolactam starting from 6-aminocapronitrile or in a process to prepare .epsilon.-caprolactam starting from 6-aminocaproic acid.

L'invention concerne un procédé pour séparer le .epsilon.-caprolactame d'un mélange aqueux contenant du .epsilon.-caprolactame et au moins 0,5 % en poids d'oligomères. La séparation se fait par extraction, au moyen d'un agent d'extraction organique. Le mélange aqueux peut être obtenu par un procédé de préparation du .epsilon.-caprolactame à partir du 6-aminocapronitrile ou par un procédé de préparation du .epsilon.-caprolactame à partir de l'acide 6-aminocaproïque.

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