Process for preparing a cationically modified...

C - Chemistry – Metallurgy – 07 – C

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C07C 221/00 (2006.01) C02F 1/56 (2006.01) C08F 8/30 (2006.01)

Patent

CA 2306797

The invention relates to a process for preparing a cationically modified (meth)acrylamide polymer by the Mannich reaction. There is prepared in advance a stable aldehyde-secondary amine adduct, which is obtained as a reaction product of an aqueous solution of the secondary amine and an aqueous solution of the aldehyde, and which, after the formation of the adduct, is stabilized to endure storage, by lowering the pH of the mixture of 7 or below and/or by adding methanol, and the adduct thus prepared is added to an aqueous solution of the (meth)acrylamide polymer and the pH is adjusted to an alkaline level, whereupon modification occurs. The invention also relates to the use of the modified (meth)acrylamide polymer as a flocculation, retention or dewatering agent.

Cette invention se rapporte à un procédé servant à préparer un polymère de (méth)acrylamide cationiquement modifié au moyen de la réaction de Mannich. A cet effet, on prépare à l'avance un produit d'addition stable à base d'amine secondaire et d'aldéhyde, qui est obtenu par la réaction d'une solution aqueuse de l'amine secondaire et d'une solution aqueuse de l'aldéhyde et qui, après formation du produit d'addition, est stabilisé pour résister à l'entreposage par abaissement du pH du mélange à 7 ou plus bas et/ou par adjonction de méthanol, le produit d'addition ainsi préparé étant alors ajouté à une solution aqueuse du polymère de (méth)acrylamide et le pH étant alors ajusté à un niveau alcalin, ce qui entraîne la modification. Cette invention se rapporte également à l'utilisation de ce polymère de (méth)acrylamide modifié comme floculant, comme séquestrant ou comme agent de déshydratation.

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