Method of water treatment

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 5/14 (2006.01) C02F 5/12 (2006.01)

Patent

CA 2712617

A method for securing the use of an aqueous medium under any substantial exclusion of metal ion interference is disclosed. A phosphonic acid compound containing: a selected phosphonate moiety and a moiety selected from a limited number of species; or hydrocarbon chains containing aminoalkylene phosphonic acid substituents; or alkylamino alkylene phosphonic acids containing an active moiety embodying N, O, and S. The technology can, by way of illustration, be used in numerous applications including secondary oil recovery, scale inhibition, industrial water treatment, paper pulp bleaching, dispersant treatment, sequestering application, brightness reversion avoidance and paper pulp treatment.

Cette invention concerne un procédé pour sécuriser l'utilisation d'un milieu aqueux en cas d'exclusion sensible quelconque de l'interférence des ions métalliques. Le composé d'acide phosphonique décrit contient une fraction phosphonate choisie et une fraction choisie parmi un nombre limité d'espèces ; ou des chaînes hydrocarbonées contenant des substituants du type acide aminoalkylène phosphonique ; ou des acides alkylamino-alkylènephosphoniques contenant une fraction active représentée par N, O et S. Cette technologie peut, à titre d'illustration, être utilisée dans de nombreuses applications, notamment la récupération d'huile secondaire, l'inhibition du tartre, le traitement des eaux industrielles, le blanchiment de la pâte à papier, le traitement par dispersants, les applications du type séquestration, l'annulation de la réversion de blancheur et le traitement de la pâte à papier.

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