Rhodia Fiber & Resin Intermediates

Rhodia Polyamide Intermediates

Lionel Sever

Philippe Leconte

Aline Seigneurin

Vincent Boschat

Jean-Pierre Brunelle

Philippe Perrona

Gérald Bocquenet

Daniel Rochette

André Chesnais

Jean-Michel Desire

A process for the hydrogenation of compounds comprising nitrile or nitro functional groups to amine, aminonitrile or aminonitro compounds is provided. The process can be a continuous process conducted in the presence of a heterogeneous hydrogenation catalyst in divided form and a basic compound. The reaction can be conducted in a stirred reactor comprising an external loop for circulating the reaction mixture, allowing one portion of the hydrogenated products to be separated without withdrawing the catalyst, by using tangential filtration. The process may be especially useful in the hydrogenation of adiponitrile to an aminocapronitrile/hexamethylenediamine mixture.

Continuous process for the hydrogenation of nitriles or nitro compounds to amines

Method for cyclizing hydrolysis of an aminonitrile compound into lactam

A method for filtering a three phase reaction mixture comprising a liquid phase, an undissolved solid catalytic phase and a gas phase includes tangentially filtering through a membrane filter at least part of the three phased reaction mixture, and recycling the catalyst while recuperating at least part of the filtrate comprising the reaction products.

Method for filtering a three-phased reaction mixture

The present invention relates to a process for the hydrogenation of aliphatic dinitriles at least partly into corresponding aminonitriles. More specifically, the invention consists of a continuous process for the hydrogenation of dinitrile, at least partly into corresponding aminonitrile, in the presence of a hydrogenation catalyst which is not dissolved in the reaction medium, characterized in that it is carried out in apparatus comprising means for the continuous separation of the hydrogenate and of the catalyst in a zone in which the gas-liquid transfer is limited or zero, the said separation and the recycling of the catalyst being carried out in a period of time less than or equal to 30 minutes.

Method for hydrogenating dinitriles

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Luzinay, France

Lionel Sever