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    • 4. 发明授权
    • Method for inhibiting scale formation and/or dispersing iron in reverse
osmosis systems
    • 在反渗透系统中抑制铁垢的形成和/或分散的方法
    • US5256303A
    • 1993-10-26
    • US916905
    • 1992-07-20
    • E. H. Kelle ZeiherCynthia A. SoderquistClaudia C. PierceKenneth P. Fivizzani
    • E. H. Kelle ZeiherCynthia A. SoderquistClaudia C. PierceKenneth P. Fivizzani
    • B01D61/04B01D65/08C02F5/12C02F5/14
    • C02F5/12B01D61/025B01D61/04B01D65/08C02F5/14B01D2311/04B01D2321/162B01D2321/168
    • A method for inhibiting calcium sulfate scale formation and deposition and/or dispersing iron from a feedstream passing through a reverse osmosis system which comprises the steps of: controlling the pH of the feedstream within the range between about 6.0 to about 7.0; controlling the temperature of the feedstream within the range between about 50.degree. to about 80.degree. F.; and adding a scale inhibitor and/or iron disperant to the feedstream in an amount between about 0.002 ppm per ppm hardness (as CaCO.sub.3) of the feedstream to about 0.005 ppm per ppm hardness (as CaCO.sub.3) of the feedstream, the scale inhibitor comprising a water-soluble organic phosphonate and an N-substituted acrylamide polymer containing an amide structure as follows: ##STR1## where R.sub.2 is hydrogen or methyl, R.sub.1 is a hydrogen or an alkyl, and R is alkylene or phenylene and X is sulfonate, (poly) hydroxyl, (poly) carboxyl or carbonyl, and combinations thereof, with the weight ratio of polymer to phosphonate being within the range of about 0.2:1 to about 2:1; provided that when X is sulfonated then R--X-- is selected from the group consisting of sulfomethyl and 2-sulfoethyl.
    • 一种通过反渗透系统从进料流中抑制硫酸钙垢形成和沉积和/或分散铁的方法,其包括以下步骤:将原料流的pH控制在约6.0至约7.0之间的范围内; 将进料流的温度控制在约50至约80°F之间的范围内; 并且以进料流的每ppm硬度(作为CaCO 3)的约0.002ppm至进料流的每ppm硬度(作为CaCO 3)至约0.005ppm的量向进料流中加入防垢剂和/或铁挥发物,阻垢剂包含 水溶性有机膦酸酯和含有酰胺结构的N-取代丙烯酰胺聚合物如下:其中R 2是氢或甲基,R 1是氢或烷基,R是亚烷基或亚苯基,X是磺酸酯(聚 )羟基,(多)羧基或羰基及其组合,聚合物与膦酸酯的重量比在约0.2:1至约2:1的范围内; 条件是当X被磺化时,则R-X-选自磺基甲基和2-磺乙基。