Dewatering agent for sludge

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 20/34 (2006.01) C02F 11/14 (2006.01)

Patent

CA 2132614

A novel process for preparing an acrylic polymer containing a tertiary amino group which is not quaternized or not salt formed and having a high molecular weight, characterized by reacting an aqueous solution of an acrylic monomer containing a tertiary amino group with carbonic acid gas to generate an acrylic monomer containing a tertiary ammonium carbonate, homopolymerizing the obtained monomer or copolymerizing the obtained monomer with the other vinyl monomer copolymerizable with the obtained monomer to give a polymer containing a structural unit of a tertiary ammonium carbonate, and decarboxylating the polymer with heating and/or reducing the pressure is provided, and particularly, an article containing a water-soluble vinyl polymer which contains at least 5 % by mole of the above-mentioned structural unit of a tertiary amino group and whose intrinsic viscosity [ .pi. ] is at least 1 dl/g is available as an excellent dewatering agent for sludge.

Nouvelle méthode pour préparer un polymère acrylique renfermant un groupe amino tertiaire non quaternisé ni converti en sel, et possédant une masse moléculaire élevée; elle consiste à faire réagir une solution aqueuse d'un monomère acrylique renfermant un groupe amino tertiaire avec du gaz carbonique pour former un monomère acrylique contenant un carbonate d'ammonium tertiaire, à homopolymériser le monomère ainsi obtenu ou à le copolymériser avec l'autre monomère vinylique copolymérisable avec le monomère obtenu, de façon à former un polymère contenant une unité structurelle d'un carbonate d'ammonium tertiaire, et à décarboxyler le polymère par chauffage et (ou) réduction de la pression; produit renfermant un polymère vinylique hydrosoluble à base d'au moins 5 % en moles de l'unité structurelle représentée par le groupe amino tertiaire ci-dessus, dont la viscosité intrinsèque [ .pi. ] est au moins de 1 dl/g; le produit est un excellent agent de déshydratation pour les boues.

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