Process for treatment of water containing azole-type anticorrosive for copper
AssigneeKurita Water Industries Ltd.
InventorsTomoharu Yasuike, Atsushi Nemoto
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Abstract
A process for treatment of water containing an azole-type anticorrosive for copper, includes adding ferrous ions to the water containing the azole-type anticorrosive for copper and having a pH of 4-8, thereby precipitating an insoluble iron-azole complex, and separating the insoluble iron-azole complex. An amount of the ferrous ions added is 0.5 to 5.0 times, by molar ratio, an amount of the azole-type anticorrosive for copper in the water containing the azole-type anticorrosive for copper. After the insoluble iron-azole complex is separated, remaining total organic carbon (TOC) components are subjected to an ozone treatment.
Claims9
A process for treatment of water containing an azole-type anticorrosive for copper, comprising:
- adding ferrous ions to the water containing the azole-type anticorrosive for copper and having a pH of 4-8, thereby precipitating an insoluble iron-azole complex, and
- separating the insoluble iron-azole complex,
- wherein an amount of the ferrous ions added is 0.5 to 5.0 times, by molar ratio, an amount of the azole-type anticorrosive for copper in the water containing the azole-type anticorrosive for copper, and
- after the insoluble iron-azole complex is separated, remaining total organic carbon (TOC) components are subjected to an ozone treatment.
A process for treatment of water containing an azole-type anticorrosive for copper, comprising:
- adding ferrous ions to the water containing the azole-type anticorrosive for copper and having a pH of 4-8, thereby precipitating an insoluble iron-azole complex, and
- separating the insoluble iron-azole complex,
- wherein an amount of the ferrous ions added is 0.5 to 5.0 times, by molar ratio, an amount of the azole-type anticorrosive for copper in the water containing the azole-type anticorrosive for copper,
- the azole-type anticorrosive for copper contains an azole compound, and
- the azole compound is at least one selected from the group consisting of imidazole, pyrazole, oxazole, isoxazole, thiazole, isothiazole, selenazole, 1,2,3-triazole, 1,2,4-triazole, 1,2,5-oxadiazole, 1,3,4-oxadiazole, 1,2,3-thiadiazole, 1,2,4-thiadiazole, 1,3,4-thiadiazole, tetrazole, 1,2,3,4-thiatriazole, derivatives thereof, amine salts thereof, and metal salts thereof.
Dependencies are inferred from the claim text.