Reclaiming e-caprolactam from nylon 6 carpet

C - Chemistry – Metallurgy – 07 – D

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C07D 223/10 (2006.01) C07D 201/12 (2006.01) C08G 69/14 (2006.01)

Patent

CA 2064658

A process for the continuous recovery of .epsilon.-caprolactam provides a carpet made from nylon 6 fibers and having a backing to a separator to prepare scrap containing nylon 6 and waste. The scrap from the separator is fed to a depolymerizing reactor where the scrap is subjected to a depolymerization catalyst, temperatures of at least the melting point of nylon 6 and superheated steam to produce an .epsilon.-caprolactam containing distillate and more waste. The .epsilon.-caprolactam in the distillate is separated from other volatiles therein; and purified.

Méthode pour la récupération en continu d'epsilon -caprolactame, permettant d'obtenir un tapis fait de fibres de nylon 6 avec support, vers un séparateur de déchets renfermant du nylon 6 et des résidus. Les déchets provenant du séparateur alimentent un réacteur de dépolymérisation où, en présence d'un catalyseur de dépolymérisation, ils sont soumis à des températures d'au moins le point de fusion du nylon 6 et à de la vapeur surchauffée pour produire un distillat renfermant l'epsilon-caprolactame et d'autres déchets. L'epsilon-caprolactame dans le distillat est séparé des autres produits volatils présents et purifié.

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