US4374733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating aqueous mediums
Assignee: Veolia WTS USA Inc
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Filing: 1981-04-01
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Granted: 1983-02-22
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Expires: 2001-04-01
Abstract
Abstract Methods are disclosed for inhibiting scale formation and dispersing solids particulate matter in aqueous mediums. An acrylic acid/lower alkyl hydroxy acrylate copolymer (I) in combination with a water soluble polymeric material (II) having the formula ##STR1## wherein a or b may be zero or a positive integer, with the proviso that a+b>1; and wherein d is H or HSO 3 , are disclosed. The method comprises administering from about 0.1-500 parts (based upon 1 million parts of the aqueous medium treated) of the combined treatment (I and II) to the particular aqueous system for which treatment is desired.
Inventors
- 👤 William R. Snyder
- 👤 Diane Feuerstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:23
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
209 words
Method of controlling the deposition of scale imparting precipitates on the structural parts of a system exposed to an aqueous medium containing scale imparting precipitates under deposit forming conditions, said scale imparting precipitates being selected from the group consisting of calcium carbonate, calcium phosphate, and calcium sulfate, and mixtures thereof, said method comprising adding to said aqueous medium an effective amount for the purpose of a water soluble polymer (I) comprising a copolymer of acrylic acid or water soluble salt thereof and 2 hydroxypropylacrylate or hydroxyethylacrylate wherein said polymer (I) has a molecular weight of from about 500 to 1,000,000, and also adding to said aqueous medium an effective amount of a water soluble polymer (III) or water soluble salt or hydrolysate acid form thereof, said polymer (III) comprising a sulfonated styrene/maleic anhydride copolymer having the formula ##STR10## wherein the molar ratio a:b of said polymer (II) is about 3:1 and wherein the molecular weight of said polymer (II) is about 1500 and wherein the molar ratio of polymer (I) to polymer (II) is about 10:1 to 1:10 and wherein said polymer (I) and (II) are added to said aqueous medium in an amount of about 0.1-500 parts polymer (I) and (II) per million parts of said aqueous medium.
Claim 2
Dependent Claim
209 words
Method of controlling the deposition of scale imparting precipitates on the structural parts of a system exposed to an aqueous medium containing scale imparting precipitates under deposit forming conditions, said scale imparting precipitates being selected from the group consisting of calcium carbonate, calcium phosphate, and calcium sulfate, and mixtures thereof, said method comprising adding to said aqueous medium an effective amount for the purpose of a water soluble polymer (I) comprising a copolymer of acrylic acid or water soluble salt thereof and 2 hydroxypropylacrylate or hydroxyethylacrylate wherein said polymer (I) has a molecular weight of from about 500 to 1,000,000, and also adding to said aqueous medium an effective amount of a water soluble polymer (III) or water soluble salt or hydrolysate acid form thereof, said polymer (III) comprising a sulfonated styrene/maleic anhydride copolymer having the formula ##STR10## wherein the molar ratio a:b of said polymer (II) is about 3:1 and wherein the molecular weight of said polymer (II) is about 1500 and wherein the molar ratio of polymer (I) to polymer (II) is about 10:1 to 1:10 and wherein said polymer (I) and (II) are added to said aqueous medium in an amount of about 0.1-500 parts polymer (I) and (II) per million parts of said aqueous medium.
Claim 3
Dependent Claim
14 words
Method as defined in claim 1 wherein said system is a steam generating system.
Claim 4
Dependent Claim
14 words
Method as defined in claim 1 wherein said system is a cooling water system.
Claim 5
Dependent Claim
208 words
Method of controlling the deposition of scale imparting precipitates on the structural parts of a system exposed to an aqueous medium containing scale imparting precipitates under deposit forming conditions, said scale imparting precipitates being selected from the group consisting of calcium carbonate, calcium phosphate, and calcium sulfate, and mixtures thereof, said method comprising adding to said aqueous medium an effective amount for the purpose of a water soluble polymer (I) comprising a copolymer of acrylic acid or water soluble salt thereof and 2 -hydroxypropylacrylate or hydroxyethylacrylate wherein said polymer (I) has a molecular weight of from about 500 to 1,000,000, and also adding to said aqueous medium an effective amount of a water soluble polymer (II) or water soluble salt or hydrolysate acid form thereof, said polymer (II) comprising a styrene/maleic anhydride copolymer having the formula ##STR11## wherein the molar ratio a:b in said polymer (II) is about 1:1 and wherein the molecular weight of said polymer (II) is about 1600 and wherein the molar ratio of polymer (I) to polymer (II) is about 10:1 to 1:10 and wherein said polymer (I) and (II) are added to said aqueous medium in an amount of about 0.1-500 parts polymer (I) and (II) per million parts of said aqueous medium.
Claim 6
Dependent Claim
208 words
Method of controlling the deposition of scale imparting precipitates on the structural parts of a system exposed to an aqueous medium containing scale imparting precipitates under deposit forming conditions, said scale imparting precipitates being selected from the group consisting of calcium carbonate, calcium phosphate, and calcium sulfate, and mixtures thereof, said method comprising adding to said aqueous medium an effective amount for the purpose of a water soluble polymer (I) comprising a copolymer of acrylic acid or water soluble salt thereof and 2 -hydroxypropylacrylate or hydroxyethylacrylate wherein said polymer (I) has a molecular weight of from about 500 to 1,000,000, and also adding to said aqueous medium an effective amount of a water soluble polymer (II) or water soluble salt or hydrolysate acid form thereof, said polymer (II) comprising a styrene/maleic anhydride copolymer having the formula ##STR11## wherein the molar ratio a:b in said polymer (II) is about 1:1 and wherein the molecular weight of said polymer (II) is about 1600 and wherein the molar ratio of polymer (I) to polymer (II) is about 10:1 to 1:10 and wherein said polymer (I) and (II) are added to said aqueous medium in an amount of about 0.1-500 parts polymer (I) and (II) per million parts of said aqueous medium.
Claim 7
Dependent Claim
14 words
Method as defined in claim 4 wherein said system is a steam generating system.
Claim 8
Dependent Claim
14 words
Method as defined in claim 4 wherein said system is a cooling water system.
Claim 9
Dependent Claim
195 words
Method of controlling the deposition of the scale imparting precipitates on the structural parts of a system exposed to an aqueous medium containing scale imparting precipitates under deposit forming conditions, said scale imparting precipitates being selected from the group consisting of calcium carbonate, calcium phosphate, and calcium sulfate, and mixtures thereof, said method comprising adding to said aqueous medium an effective amount for the purpose of a water soluble polymer (I) comprising a copolymer of acrylic acid or water soluble salt thereof and 2-hydroxypropylacrylate or hydroxyethylacrylate wherein said polymer (I) has a molecular weight of from about 500 to 1,000,000, and also adding to said aqueous medium an effective amount of a water soluble polymer (II) or water soluble salt or hydrolysate acid form thereof, said polymer (II) comprising a sulfonated styrene polymer having the formula ##STR12## wherein the molecular weight of said polymer (II) is about 70,000, and wherein the molar ratio of polymer (I) to polymer (II) is about 10:1 to 1:10 and wherein said polymer (I) and (II) are added to said aqueous medium in an amount of about 0.1-500 parts polymer (I) and (II) per million parts of said aqueous medium.
Claim 10
Dependent Claim
195 words
Method of controlling the deposition of the scale imparting precipitates on the structural parts of a system exposed to an aqueous medium containing scale imparting precipitates under deposit forming conditions, said scale imparting precipitates being selected from the group consisting of calcium carbonate, calcium phosphate, and calcium sulfate, and mixtures thereof, said method comprising adding to said aqueous medium an effective amount for the purpose of a water soluble polymer (I) comprising a copolymer of acrylic acid or water soluble salt thereof and 2-hydroxypropylacrylate or hydroxyethylacrylate wherein said polymer (I) has a molecular weight of from about 500 to 1,000,000, and also adding to said aqueous medium an effective amount of a water soluble polymer (II) or water soluble salt or hydrolysate acid form thereof, said polymer (II) comprising a sulfonated styrene polymer having the formula ##STR12## wherein the molecular weight of said polymer (II) is about 70,000, and wherein the molar ratio of polymer (I) to polymer (II) is about 10:1 to 1:10 and wherein said polymer (I) and (II) are added to said aqueous medium in an amount of about 0.1-500 parts polymer (I) and (II) per million parts of said aqueous medium.
Claim 11
Dependent Claim
14 words
Method as defined in claim 7 wherein said system is a steam generating system.
Claim 12
Dependent Claim
14 words
Method as defined in claim 7 wherein said system is a cooling water system.
Claim 13
Dependent Claim
194 words
Method of controlling the deposition of scale imparting precipitates on the structural parts of a system exposed to an aqueous medium containing scale imparting precipitates under deposit forming conditions, said scale imparting precipitates being selected from the group consisting of calcium carbonate, calcium phosphate, and calcium sulfate, and mixtures thereof, said method comprising adding to said aqueous medium an effective amount for the purpose of a water soluble polymer (I) comprising a copolymer of acrylic acid or water soluble salt thereof and 2-hydroxypropylacrylate or hydroxyethylacrylate wherein said polymer (I) has a molecular weight of from about 500 to 1,000,000, and also adding to said aqueous medium an effective amount of a water soluble polymer (II) or water soluble salt or hydrolysate acid form thereof, said polymer (II) comprising a polymaleic anhydride polymer having the formula ##STR13## wherein the molecular weight of said polymaleic anhydride is about 800-1,000, and wherein the molar ratio of polymer (I) to polymer (II) is about 10:1 to 1:10 and wherein said polymer (I) and (II) are added to said aqueous medium in an amount of about 0.1-500 parts polymer (I) and (II) per million parts of said aqueous medium.
Claim 14
Dependent Claim
194 words
Method of controlling the deposition of scale imparting precipitates on the structural parts of a system exposed to an aqueous medium containing scale imparting precipitates under deposit forming conditions, said scale imparting precipitates being selected from the group consisting of calcium carbonate, calcium phosphate, and calcium sulfate, and mixtures thereof, said method comprising adding to said aqueous medium an effective amount for the purpose of a water soluble polymer (I) comprising a copolymer of acrylic acid or water soluble salt thereof and 2-hydroxypropylacrylate or hydroxyethylacrylate wherein said polymer (I) has a molecular weight of from about 500 to 1,000,000, and also adding to said aqueous medium an effective amount of a water soluble polymer (II) or water soluble salt or hydrolysate acid form thereof, said polymer (II) comprising a polymaleic anhydride polymer having the formula ##STR13## wherein the molecular weight of said polymaleic anhydride is about 800-1,000, and wherein the molar ratio of polymer (I) to polymer (II) is about 10:1 to 1:10 and wherein said polymer (I) and (II) are added to said aqueous medium in an amount of about 0.1-500 parts polymer (I) and (II) per million parts of said aqueous medium.
Claim 15
Dependent Claim
14 words
Method as defined in claim 10 wherein said system is a steam generating system.
Claim 16
Dependent Claim
14 words
Method as defined in claim 10 wherein said system is a cooling water system.
Claim 17
Independent Claim
177 words
A method of dispersing and maintaining dispersed particulate matter in a system having an aqueous medium which contains particulate matter selected from the group consisting of clay and iron oxide and mixtures thereof, said method comprising adding to said aqueous medium an effective amount for the purpose of a water soluble polymer (I) comprising a copolymer of acrylic acid or water soluble salt thereof and 2-hydroxypropylacrylate or hydroxyethylacrylate wherein said polymer (I) has a molecular weight of from about 500 to 1,000,000 and also adding to said aqueous medium an effective amount of a water soluble polymer (II) or water soluble salt or hydrolysate acid form thereof, said polymer (II) comprising a sulfonated styrene polymer having the formula ##STR14## wherein the molecular weight of said polymer (II) is about 70,000, and wherein the molar ratio of polymer (I) to polymer (II) is about 10:1 to 1:10 and wherein said polymer (I) and (II) are added to said aqueous medium in an amount of about 0.1-500 parts polymer (I) and (II) per million parts of said aqueous medium.
Claim 18
Independent Claim
177 words
A method of dispersing and maintaining dispersed particulate matter in a system having an aqueous medium which contains particulate matter selected from the group consisting of clay and iron oxide and mixtures thereof, said method comprising adding to said aqueous medium an effective amount for the purpose of a water soluble polymer (I) comprising a copolymer of acrylic acid or water soluble salt thereof and 2-hydroxypropylacrylate or hydroxyethylacrylate wherein said polymer (I) has a molecular weight of from about 500 to 1,000,000 and also adding to said aqueous medium an effective amount of a water soluble polymer (II) or water soluble salt or hydrolysate acid form thereof, said polymer (II) comprising a sulfonated styrene polymer having the formula ##STR14## wherein the molecular weight of said polymer (II) is about 70,000, and wherein the molar ratio of polymer (I) to polymer (II) is about 10:1 to 1:10 and wherein said polymer (I) and (II) are added to said aqueous medium in an amount of about 0.1-500 parts polymer (I) and (II) per million parts of said aqueous medium.
Claim 19
Dependent Claim
14 words
Method as defined in claim 13 wherein said system is a steam generating system.
Claim 20
Dependent Claim
14 words
Method as defined in claim 13 wherein said system is a cooling water system.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |