C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 5/08 (2006.01) C02F 5/14 (2006.01) C02F 1/68 (2006.01) C02F 1/70 (2006.01) C02F 1/72 (2006.01)
Patent
CA 2362639
The invention relates to a method for removing deposits from water transmission systems and devices for supplying water, or individual components thereof. Deposits are dissolved using an aqueous treating solution and are separated in dissolved form from the system or the device or individual components thereof, wherein said deposits are dissolved using an aqueous treatment solution comprising a combination of (i) a reducing agent, in particular in the form of a salt-like, reducing sulfur-oxide compound, nitrogen oxide compound or phosphorous oxide compound and (ii) a complexing agent having phosphonic acid or phosphonate groups or a complexing agent of the hydroxy acid type at pH values in the range of approximately 4.5 to 9.5, in particular from approximately 6.0 to 8Ø
L'invention concerne un procédé pour enlever des dépôts présents dans des systèmes aquifères et des installations de distribution d'eau, ou des parties individuelles de ces derniers. Selon ce procédé, on met en solution les dépôts au moyen d'une solution de traitement aqueuse et on les sépare sous forme dissoute du système, de l'installation ou de parties individuelles de ces derniers. Cette solution de traitement aqueuse, présentant un pH compris entre 4,5 et 9,5 environ, notamment entre 6,0 et 8,0 environ, contient une combinaison constituée (i) d'un agent de réduction, se présentant notamment sous la forme d'un composé oxyde sulfurique, oxyde nitrique ou oxyde phosphorique réducteur salin, et (ii) d'un agent complexant comportant des groupes acide phosphonique ou phosphonate, ou d'un agent complexant du type acide hydroxylique.
Maier Georg
Nurnberger Michael
Nusko Robert
Fetherstonhaugh & Co.
R. Spaene Kg
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