Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...
Patent
1987-03-03
1988-03-29
Hruskoci, Peter
Liquid purification or separation
Processes
Preventing, decreasing, or delaying precipitation,...
252180, 252391, 252392, 422 16, C02F 512
Patent
active
047342030
ABSTRACT:
This invention discloses a method of improving the constitution of boiler water by adding thereto an effective amount of a copper transport agent which is either rubeanic acid or a low molecular weight polymer of polypiperazine methyl-para-hydroxysulfonic acid or polypiperazine methyl-para-hydroxybenzoic acid. The copper transport agent satisfactorily separates the copper from iron, calcium, magnesium and other heavy metals with a high degree of selectivity. The chelant may be added in a ratio of 100/1 to 10/1 chelant/copper and an advantageous ratio in the case of the polymer is 50/1 ppm active polymer to 1 ppm Cu. The chelants, which form a soluble chelate with Cu, is capable of removing Cu through boiler blowdown in an operating, layup or cleanup boiler. This adds an anti-corrosion factor to the galvanized boiler corrosion.
REFERENCES:
patent: 3803042 (1974-04-01), Knox et al.
patent: 4190709 (1980-02-01), Hodgkin
patent: 4465620 (1984-08-01), Thompson
patent: 4545920 (1985-10-01), Lorenc et al.
patent: 4657785 (1987-04-01), Kelly et al.
Lin Mei-jan L.
Sibert Frederick J.
Cupoli Anthony L.
Hruskoci Peter
Nalco Chemical Company
Premo John G.
Roberts, Jr. John S.
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