C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 5/14 (2006.01) C02F 1/56 (2006.01) C02F 1/58 (2006.01) C02F 5/10 (2006.01) C02F 5/12 (2006.01) C23F 15/00 (2006.01)
Patent
CA 2401271
A method for reducing/preventing the formation of scale or removal of scale in a municipal or industrial waste water treatment facility comprising introducing an antiscalent composition which comprises: A) A water soluble polymer of molecular weight below 20,000 and containing anionic groups, and B) A sequesterant compound containing at least one phosphonate group and salts thereof, characterised in that component (A) is formed from a monomer or monomer blend consisting of one or more ethylenically unsaturated carboxylic acid monomer(s) and optionally not more that 50 % by weight of an ethylenically unsaturated water-soluble nonionic monomer. Preferred antiscalent compositions include a blend of A) a polymer of acrylic acid and/or maleic acid and B) diethylentriamine penta (methylenephosphonic acid) or salts thereof. Also claimed is the use of the above composition for the treatment of struvite scale.
L'invention porte sur un procédé réduisant ou empêchant la formation de tartre ou d'élimination du tartre dans les installations municipales ou industrielles de traitement des eaux usées, consistant en l'adjonction d'une composition antitartre comportant: A) un polymère hydrosoluble de poids moléculaire inférieur à 20.000 contenant des groupes anioniques, et B) un composé séquestrant contenant au moins un groupe phosphonate et ses sels. Le composant A est formé d'un monomère ou d'un mélange de monomères comprenant un ou plusieurs monomères d'acide carboxylique non saturés en éthylène et facultativement moins de 50 % en poids d'un monomère hydrosoluble non ionique non saturé en éthylène. Les compositions antitartre préférées contiennent: un mélange de A) un polymère de l'acide acrylique et/ou de l'acide maléïque, et B) du diéthylentriamine penta (acide méthylènephosphonique) ou ses sels. L'invention porte en outre sur l'utilisation de la susdite pour traiter le tartre de struvite.
Ciba Specialty Chemicals Water Treatments Limited
Fetherstonhaugh & Co.
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