Flocculating or viscosifying compositions and their...

C - Chemistry – Metallurgy – 08 – J

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C08J 3/12 (2006.01) B01D 21/01 (2006.01)

Patent

CA 2247184

Primary polymer particles having a size at least 90 % below 10µm and which contain water-soluble and water-insoluble polymer are made by reverse phase polymerisation of a water-soluble ethylenically unsaturated monomer or monomer blend with cross-linking agent, and the emulsion is then spray-dried to form spray-dried granules which disintegrate upon addition to water, thereby forming an aqueous composition of the insoluble particles having activity similar to the starting emulsion. This aqueous composition of insoluble particles is particularly useful for flocculation, for instance, flocculation of sewage sludge followed by centrifugation or belt pressing, or for viscosification.

L'invention porte sur des particules de polymères primaires dont 90 % ont une taille inférieure à 10µm et qui comportent à la fois des polymères hydrosolubles et non hydrosolubles, ces particules étant obtenues par polymérisation en phase inverse d'un monomère hydrosoluble insaturé en éthylène ou d'un mélange de monomères avec un agent de réticulation, et par pulvérisation sèche de l'émulsion pour former des granulés qui se désintègrent lorsqu'on les additionne à de l'eau en formant une composition aqueuse de particules insolubles présentant une activité similaire à celle de l'émulsion de départ. Cette composition aqueuse de particules insolubles s'avère particulièrement utile pour la floculation notamment des boues résiduaires, suivie d'une centrifugation ou d'un essorage sur bande, ou pour la viscosification.

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