Liquid purification or separation – Processes – Preventing – decreasing – or delaying precipitation,...
Patent
1983-05-24
1984-04-17
Hruskoci, Peter A.
Liquid purification or separation
Processes
Preventing, decreasing, or delaying precipitation,...
210698, 210701, 252181, 252389A, 422 13, 422 16, 422 17, C02F 512
Patent
active
044433409
ABSTRACT:
A method for inhibiting corrosion and controlling deposition in an iron containing aqueous medium is disclosed. The method is capable of providing for the formation of a protective passive oxide film on the metallic surfaces in contact with the aqueous medium without resulting in unacceptable iron based deposition or fouling. Surprisingly, the method does not call for the addition of an organic-phosphonic acid compound or derivative to the aqueous medium as would be normally expected due to the known iron dispersing characteristics of these type compounds. The invention comprises maintaining the pH level at 5.5 or above, assuring that a certain minimal calcium or other ion level is maintained, and adding to the system an orthophosphate compound, a water soluble acrylic acid/hydroxyalkylacrylate copolymer, and a topping agent selected from the group consisting of effective water soluble aminocarboxylic acids, lignosulfonates, citric acid, and tannic acid, and water soluble salt forms and mixtures thereof.
REFERENCES:
patent: 2711391 (1955-06-01), Kahler
patent: 2793932 (1957-05-01), Kahler et al.
patent: 2848299 (1958-08-01), Kahler et al.
patent: 2872281 (1959-02-01), Kahler et al.
patent: 2900222 (1959-08-01), Kahler et al.
patent: 3463730 (1969-08-01), Booth et al.
patent: 3837803 (1974-09-01), Carter et al.
patent: 4029577 (1977-06-01), Godlewski et al.
patent: 4209398 (1980-06-01), Ii et al.
patent: 4303568 (1981-12-01), May et al.
patent: 4326980 (1982-04-01), Snyder et al.
patent: 4387027 (1983-06-01), May et al.
May Roger C.
Sessa Frank C.
Betz Laboratories Inc.
Hruskoci Peter A.
Peacock Bruce E.
Ricci Alexander D.
LandOfFree
Control of iron induced fouling in water systems does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control of iron induced fouling in water systems, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control of iron induced fouling in water systems will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-94494