A method of regenerating a catalyst

B - Operations – Transporting – 01 – J

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B01J 23/96 (2006.01) B01J 38/68 (2006.01) C01B 21/14 (2006.01)

Patent

CA 2584802

Platinum is applied on a carrier such as graphite to form a platinum catalyst. The catalyst becomes poisoned with a metal as a result of use of the catalyst in preparation of hydroxylammonium salts. A method of regenerating the catalyst dissolves the platinum and the metal in an acid. The method also adds ammonium sulfate to the acid to precipitate the platinum. The ammonium sulfate is a by-product of a commercial process to synthesize a caprolactam. Also, the method precipitates the platinum onto the carrier for reuse in the preparation of the hydroxylammonium salts and in preparation of the caprolactam.

Le procédé de l'invention consiste à appliquer du platine sur un support tel que le graphite de façon à former un catalyseur platine. Le catalyseur est empoisonné par un métal conséquemment à l'utilisation du catalyseur dans la préparation de sels d'hydroxyammonium. Un procédé de régénération du catalyseur consiste à dissoudre le platine et le métal dans un acide. Le procédé consiste également à ajouter du sulfate d'ammonium à l'acide pour précipiter le platine. Le sulfate d'ammonium est un sous-produit d'un procédé commercial de synthèse d'un caprolactame. Le procédé consiste également à précipiter le platine sur le support pour le réutiliser dans la préparation de sels d'hydroxyammonium et dans la préparation du caprolactame.

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