Method for regenerating a hydrogenation catalyst, method for hydrogenating compounds comprising nitrile functions
AssigneeRhodia Fiber & Resin Intermediates
InventorsVincent Boschat, Philippe Leconte
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Abstract
The invention concerns a method for regenerating a hydrogenation catalyst, and hydrogenation methods carried out with a catalyst comprising at least one regenerated catalyst. More particularly, it concerns a method for regenerating Raney catalysts used in total or partial hydrogenating processes of compounds comprising nitrile functions into amine functions. Said method consists in treating the spent catalyst with a basic solution and optionally in subjecting said catalyst to hydrogenation before stripping to eliminate the impurities present on the catalyst. Thus, the regenerating method enables to recuperate up to 100% of the catalytic activity.
Claims14
Process for regenerating catalysts of the Raney catalyst type for the total or partial hydrogenation of nitrile functions into amine functions of organic compounds, comprising mixing the spent catalyst, extracted from the reaction medium, with an aqueous solution of a basic compound having a basic ion concentration of greater than 0.01 mol/l, maintaining the mixture at a temperature below 130° C. and then washing the treated catalyst with water or a basic solution until the final pH of the washing waters is between 12 and 13.
Dependencies are inferred from the claim text.