Modified polymeric flocculants with improved performance...

Details Modified polymeric flocculants with improved performance... Modified polymeric flocculants with improved performance...

C - Chemistry, Metallurgy

08

F

C08F 220/56 (2006.01) C02F 1/56 (2006.01) C08F 220/34 (2006.01) C08F 220/60 (2006.01)

Patent

CA 2504890

Methods for the preparation of high molecular weight cationic poly(meth) acrylamide/quaternary ammonium salt copolymers are disclosed wherein after at least about 50% of the monomers have been polymerized, a cross-linking agent is then added to the reaction mixture on a continuous basis and in the absence of any feed of chain transfer agent. Cationic copolymers so produced exhibit improved floc formation properties and are useful as flocculants and dewatering aids in aqueous systems that include an oily sludge or the like.

L'invention concerne des méthodes de préparation de copolymères cationiques poly(méth)acrylamide/sel d'ammonium quaternaire à poids moléculaire élevé. Au moins environ 50 % des monomères ont été polymérisés, un agent de réticulation est ensuite ajouté en continu au mélange de réaction, en l'absence de toute charge d'agent de migration de chaîne. Les copolymères cationiques ainsi obtenus présentent des propriétés de floculation améliorées et sont utiles en tant que floculants et auxiliaires de déshydratation dans des systèmes aqueux qui contiennent une suspension huileuse ou analogue.

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