Process for preventing formation of scale
AssigneeKurita Water Industries Ltd.
InventorsTakashi Suzuki, Akihide Hirano, Hermann Kempen, Katsuhiro Ishikawa, Masahiro Shiratani
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Abstract
A process for preventing formation of scale which comprises adding, into a water system in which ozone is used for disinfection, a polymeric scale inhibitor having a high molecular weight which gives an average molecular weight within an optimum range for preventing formation of scale after the polymeric scale inhibitor is decomposed with ozone. In accordance with the process, the polymeric scale inhibitor having an average molecular weight within the optimum range for preventing formation of scale is present in the water system in which ozone is used for disinfection and formation of scale is effectively prevented.
Claims19
A process for preventing formation of scale in a water system which contains ozone for disinfection comprising:
- (i) determining by a measurement an optimum range of an average molecular weight of a polymeric scale inhibitor having a high molecular weight for preventing formation of scale after decomposition of the polymeric scale inhibitor by ozone, from a relationship between the average molecular weight of the polymeric scale inhibitor and an effect of preventing formation of scale,
- (ii) determining by a measurement a relationship between a rate of supply of the ozone and a rate of decomposition of the polymeric scale inhibitor,
- (iii) determining an initial average molecular weight of the polymeric scale inhibitor which provides an average molecular weight within the optimum range for preventing formation of scale after the polymeric scale inhibitor is decomposed by the ozone from the rate of supply of the ozone and a period of time of contact between the polymeric scale inhibitor and the ozone;
- and
- (iv) adding the polymeric scale inhibitor having the determined initial average molecular weight into the water system.
A process for preventing formation of scale which comprises adding, into a water system which contains ozone for disinfection, a polymeric scale inhibitor having a high molecular weight, the polymeric scale inhibitor having an average molecular weight within an optimum range for preventing formation of scale after the polymeric scale inhibitor is decomposed with ozone, wherein said polymeric scale inhibitor is a copolymer which is obtained from acrylic acid and 3-allyloxy-2-hydroxypropanesulfonic acid, or a neutralized salt of the copolymer.
A process for preventing formation of scale which comprises adding, into a water system which contains ozone for disinfection, a polymeric scale inhibitor having a high molecular weight, the polymeric scale inhibitor having an average molecular weight within an optimum range for preventing formation of scale after the polymeric scale inhibitor is decomposed with ozone, wherein said polymeric scale inhibitor is a copolymer which is obtained from acrylic acid and 3-allyloxy-2-hydroxypropane-sulfonic acid in amounts such that a ratio of amounts by mole of the acrylic acid to the 3-allyloxy-2-hydroxypropanesulfonic acid is 85 to 80/15 to 20, or a neutralized salt of the copolymer.
Dependencies are inferred from the claim text.