Mouldable materials which can be used as a catalyst

Details Mouldable materials which can be used as a catalyst Mouldable materials which can be used as a catalyst

C - Chemistry, Metallurgy

07

D

C07D 201/08 (2006.01) B01J 21/06 (2006.01) B01J 37/06 (2006.01)

Patent

CA 2302441

The present invention relates to mouldable materials which can be used as a catalyst for producing cyclic lactames by reacting aminocarboxylic acid nitriles with water in a liquid phase in a fixed bed reactor. The mouldable materials contain no reaction-soluble constituent and contain pyrogenic titanium dioxide as their main component. The mouldable materials can be obtained by moulding the pyrogenic titanium dioxide into moulded articles, and by processing the pyrogenic titanium dioxide before or after moulding with an acid in which it dissolves with difficulty, wherein said acid is taken in amount of between 0.1 and 30 wt % relative to said pyrogenic titanium dioxide.

L'invention concerne des matières moulables pouvant être utilisées comme catalyseur pour la production de lactames cycliques par réaction de nitriles d'acide aminocarboxylique avec de l'eau en phase liquide dans un réacteur à lit fixe, lesquelles ne présentent aucun constituant soluble dans les conditions de réaction et contiennent, comme constituant essentiel, du dioxyde de titane pyrogène. Ces matières moulables peuvent être obtenues par moulage du dioxyde de titane pyrogène, qui donne des corps moulés, et traitement du dioxyde de titane pyrogène, avant ou après le moulage, avec 0,1 à 30 % en poids par rapport au dioxyde de titane pyrogène, d'un acide dans lequel celui-ci est difficilement soluble.

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