US4560481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling iron induced fouling in water systems
Assignee: Veolia WTS USA Inc
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Filing: 1984-12-13
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Granted: 1985-12-24
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Expires: 2004-12-13
Abstract
Abstract A method of inhibiting corrosion and controlling deposition in aqueous mediums, such as in cooling water systems, wherein iron containing well water is used as a water make-up source, is disclosed. The method comprises addition of certain water soluble acrylic acid type/allyl hydroxy propyl sulfonate ether copolymers to the desired aqueous medium.
Inventors
- 👤 Orin Hollander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:05
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/173; C02; C02F; C02F5/00; C02F5/08; C02F5/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
A method of inhibiting corrosion and controlling deposition in a cooling water system of the type comprising iron species present in said cooling water in a deposit forming amount and under deposit forming conditions, wherein surface active Fe +3 ions are admitted to said cooling water, said method comprising adding to said cooling water an effective amount of a water soluble copolymer comprising repeat unit moieties (a) and (b) wherein said repeat unit moiety (a) comprises the structure: ##STR4## and wherein said repeat unit (b) comprises the structure: ##STR5## wherein x and y are integers and the ratio of x:y is in the range of about 10:1 to 1:5, R 1 is H or lower alkyl (C 1 -C 3 ), R 2 is OH, OM, or NH 2 , M is H or a water soluble cation.
Claim 2
Independent Claim
138 words
A method of inhibiting corrosion and controlling deposition in a cooling water system of the type comprising iron species present in said cooling water in a deposit forming amount and under deposit forming conditions, wherein surface active Fe +3 ions are admitted to said cooling water, said method comprising adding to said cooling water an effective amount of a water soluble copolymer comprising repeat unit moieties (a) and (b) wherein said repeat unit moiety (a) comprises the structure: ##STR4## and wherein said repeat unit (b) comprises the structure: ##STR5## wherein x and y are integers and the ratio of x:y is in the range of about 10:1 to 1:5, R 1 is H or lower alkyl (C 1 -C 3 ), R 2 is OH, OM, or NH 2 , M is H or a water soluble cation.
Claim 3
Dependent Claim
24 words
A method as recited in claim 1 wherein said iron species are admitted to said cooling water system from a well water makeup source.
Claim 4
Dependent Claim
23 words
A method as recited in claim 1 wherein the number average molecular weight (Mn) of said copolymer is between about 1,000 to 1,000,000.
Claim 5
Dependent Claim
21 words
A method as recited in claim 3 wherein said number average molecular weight (Mn) of said copolymer is between about 2,000-10,000.
Claim 6
Dependent Claim
35 words
A method as recited in claim 1 wherein said water soluble copolymer is added to said aqueous medium in an amount of about 0.1-500 parts polymer based upon 1 million parts of said aqueous medium.
Claim 7
Dependent Claim
21 words
A method as recited in claim 1 wherein said repeat unit (a) comprises acrylic acid or water soluble salt form thereof.
Claim 8
Dependent Claim
66 words
A method as recited in claim 1 further comprising, adding to said aqueous medium, between about 6 to 30 parts per million, based upon one million parts of said aqueous medium, of a water soluble orthophosphate compound, said copolymer and said orthophosphate compound resulting in the formation of a passivated film along metallic surfaces in contact with said aqueous medium without resulting in substantial deposition thereon.
References Cited (Backward Citations)
US3837803A
Cited
US4029577A
Cited
JPS587415A
Cited
US4500693A
Cited
JPS589987A
Cited
US4387027A
Cited
US4443340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |