US3931038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scale and corrosion inhibition for cooling water systems
Assignee: ChampionX LLC
•
Filing: 1973-07-31
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Granted: 1976-01-06
•
Expires: 1993-07-31
Abstract
Abstract A corrosion and scale inhibiting composition and process useful in recirculating cooling water systems consisting essentially of the following components calculated as weight percent: Alkoxylated polyol phosphate ester 30 to 50% ZnCl 2 2 to 25% Tannin 5 to 25% Water 30 to 10%
Inventors
- 👤 Francesca Mochi-Bartolani
- 👤 Mauro Minervini
- 👤 Aurelio Mannini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:58
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14; C02F5/145
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
97 words
A corrosion and scale inhibiting composition useful in preventing corrosion of iron and other metal surfaces in contact with cooling water consisting of: Range
______________________________________
1) Alkoxylated polyol
phosphate ester 30-50%
2) ZnCl.sub.2 2-25%
3) Tannin 5-25%
4) Water 30-10%
______________________________________ wherein said polyol ester is R'(OR)y where R' is an aliphatic hydrocarbon radical from 1-6 carbon atoms and Y = 2-5 and where R is: ##EQU6## n is 1 to 30, and AlkO is an ethylene oxide, a propylene oxide or a butylene oxide with the proviso that at least one occurrence of R is (B).
Claim 2
Dependent Claim
97 words
A corrosion and scale inhibiting composition useful in preventing corrosion of iron and other metal surfaces in contact with cooling water consisting of: Range
______________________________________
1) Alkoxylated polyol
phosphate ester 30-50%
2) ZnCl.sub.2 2-25%
3) Tannin 5-25%
4) Water 30-10%
______________________________________ wherein said polyol ester is R'(OR)y where R' is an aliphatic hydrocarbon radical from 1-6 carbon atoms and Y = 2-5 and where R is: ##EQU6## n is 1 to 30, and AlkO is an ethylene oxide, a propylene oxide or a butylene oxide with the proviso that at least one occurrence of R is (B).
Claim 3
Dependent Claim
24 words
The composition according to claim 1 consisting essentially of: 1) Alkoxylated polyol
phosphate ester 40%
2) ZnCl.sub.2 20%
3) Tannin 10%
4) Water 30%
Claim 4
Dependent Claim
38 words
The composition according to claim 1 wherein the alkoxylated polyol phosphate ester is: ##EQU7## where R is: ##EQU8## n is 1-10 and AlkO is ethylene oxide with the proviso that at least one occurrence of R is (B).
Claim 5
Dependent Claim
10 words
The composition according to claim 3 where n = 1.
Claim 6
Dependent Claim
120 words
A process for inhibiting scale and corrosion of a ferrous metal surface in contact with a corrosion cooling water medium which comprises maintaining contact of said surface with said water which additionally contains between 30 to 150 ppm of a composition in weight percent consisting of: Range
______________________________________
1) Alkoxylated polyol
phosphate ester 30-50%
2) ZnCl.sub.2 2-25%
3) Tannin 5-25%
4) Water 30-10%
______________________________________ wherein said polyol ester is R'(OR)Y where R' is an aliphatic hydrocarbon radical from 1-6 carbon atoms and Y = 2-5 and where R is: ##EQU9## n is 1 to 30, and AlkO is an ethylene oxide, a propylene oxide or a butylene oxide with the proviso that at least one occurrence of R is (B).
Claim 7
Dependent Claim
120 words
A process for inhibiting scale and corrosion of a ferrous metal surface in contact with a corrosion cooling water medium which comprises maintaining contact of said surface with said water which additionally contains between 30 to 150 ppm of a composition in weight percent consisting of: Range
______________________________________
1) Alkoxylated polyol
phosphate ester 30-50%
2) ZnCl.sub.2 2-25%
3) Tannin 5-25%
4) Water 30-10%
______________________________________ wherein said polyol ester is R'(OR)Y where R' is an aliphatic hydrocarbon radical from 1-6 carbon atoms and Y = 2-5 and where R is: ##EQU9## n is 1 to 30, and AlkO is an ethylene oxide, a propylene oxide or a butylene oxide with the proviso that at least one occurrence of R is (B).
Claim 8
Dependent Claim
28 words
The process according to claim 5 wherein the percentage relationships are as follows: 1) Alkoxylated polyol
phosphate ester 40%
2) ZnCl.sub.2 20%
3) Tannin 10%
4) Water 30%
Claim 9
Dependent Claim
38 words
The process according to claim 5 wherein the alkoxylated polyol phosphate ester is: ##EQU10## where R is: ##EQU11## n is 1-10 and AlkO is ethylene oxide with the proviso that at least one occurrence of R is (B).
Claim 10
Dependent Claim
10 words
The process according to claim 7 where n = 1.
References Cited (Backward Citations)
US3462365A
Cited
US3518203A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |