US4288327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers for the control of the formation and deposition of materials in aqueous mediums
Assignee: Veolia WTS USA Inc
•
Filing: 1979-01-19
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Granted: 1981-09-08
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Expires: 1999-01-19
Abstract
Abstract The present invention relates to processes for controlling the formation and deposition of scale and sludge and in particular calcium phosphate which would otherwise occur in aqueous mediums containing sludge and the ions capable of forming scale. The invention, more particularly, relates to the control, reduction and/or prevention of scale and sludge deposits in cooling water, scrubber and steam generating systems, evaporators, economizers, and the like by the introduction of a copolymer comprising sulfonated styrene and maleic anhydride moieties to the water used therein. The copolymers discovered to be particularly effective for the purpose are those having a mole ratio of sulfonated styrene moieties to moieties derived from maleic anhydride of from about 2:1 to about 4:1 and preferably 2:1 to 3:1 with certain type deposits.
Inventors
- 👤 Irene T. Godlewski
- 👤 Joseph J. Schuck
- 👤 Andrew S. Chisarik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:17
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10
Claims Analysis
Total Claims: 67
Claim 1
Independent Claim
92 words
A method of controlling the formation and deposition of materials on the structural parts of a system containing an aqueous medium, which in turn contains ions which would otherwise form and deposit as said materials, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 2
Independent Claim
92 words
A method of controlling the formation and deposition of materials on the structural parts of a system containing an aqueous medium, which in turn contains ions which would otherwise form and deposit as said materials, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 3
Dependent Claim
30 words
A method according to claim 1, wherein the amount of polymer introduced is from about 0.5 to about 100 parts of polymer per million parts of water in said system.
Claim 4
Dependent Claim
19 words
A method according to claim 2, wherein the polymer has a molecular weight of from about 500 to 100,000.
Claim 5
Dependent Claim
23 words
A method according to claim 2, wherein the polymer possesses a ratio of said styrene moieties to said anhydride derived moieties of 3:1.
Claim 6
Dependent Claim
27 words
A method according to claim 1, wherein the polymer possesses a ratio of said styrene moieties to said anhydride derived moieties of from about 2:1 to 3:1.
Claim 7
Dependent Claim
27 words
A method according to claim 5, wherein the polymer introduced is in an amount of from about 0.5 to about 100 parts per million parts of water.
Claim 8
Dependent Claim
19 words
A method according to claim 6, wherein the polymer has a molecular weight of from about 500 to 100,000.
Claim 9
Dependent Claim
25 words
A method according to claim 7, wherein the polymer introduced is from about 2.5 to 25 parts per million parts of water in said system.
Claim 10
Dependent Claim
20 words
A method according to claim 8, wherein the polymer is in the form of the sodium salt of said polymer.
Claim 11
Dependent Claim
14 words
A method according to claim 5, wherein the system is a gas scrubbing system.
Claim 12
Independent Claim
123 words
A method of controlling the formation and deposition of at least one compound selected from the group consisting of calcium phosphate, magnesium phosphate, magnesium silicate, calcium silicate, and iron oxide and mixtures thereof on the structural parts of a system containing an aqueous medium which in turn contains the compounds or ions which would otherwise lead to the formation and deposition of said compound or compounds, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 13
Independent Claim
123 words
A method of controlling the formation and deposition of at least one compound selected from the group consisting of calcium phosphate, magnesium phosphate, magnesium silicate, calcium silicate, and iron oxide and mixtures thereof on the structural parts of a system containing an aqueous medium which in turn contains the compounds or ions which would otherwise lead to the formation and deposition of said compound or compounds, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 14
Dependent Claim
30 words
A method according to claim 11, wherein the amount of polymer introduced is from about 0.5 to about 100 parts of polymer per million parts of water in said system.
Claim 15
Dependent Claim
19 words
A method according to claim 12, wherein the polymer has a molecular weight of from about 500 to 100,000.
Claim 16
Dependent Claim
26 words
A method according to claim 13, wherein the polymer possesses a ratio of said styrene moieties to said anhydride derived moieties of about 2:1 to 3:1.
Claim 17
Dependent Claim
23 words
A method according to claim 11, wherein the polymer possesses a ratio of said styrene moieties to said anhydride derived moieties of 3:1.
Claim 18
Dependent Claim
27 words
A method according to claim 15, wherein the polymer introduced is in an amount of from about 0.5 to about 100 parts per million parts of water.
Claim 19
Dependent Claim
19 words
A method according to claim 16, wherein the polymer has a molecular weight of from about 500 to 100,000.
Claim 20
Dependent Claim
25 words
A method according to claim 17, wherein the polymer introduced is from about 2.5 to 25 parts per million parts of water in said system.
Claim 21
Dependent Claim
20 words
A method according to claim 18, wherein the polymer is in the form of the sodium salt of said polymer.
Claim 22
Dependent Claim
21 words
A method according to claim 18, wherein the system is a cooling water system and wherein the compound is calcium phosphate.
Claim 23
Dependent Claim
21 words
A method according to claim 15, wherein the system is a cooling water system and wherein the compound is calcium phosphate.
Claim 24
Dependent Claim
14 words
A method according to claim 15, wherein the system is a gas scrubbing system.
Claim 25
Independent Claim
88 words
A method of dispersing a compound selected from the group of iron oxide, clay and mixtures thereof contained in an aqueous medium which would otherwise deposit on the structural parts containing said medium, which comprises introducing in said medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene to said maleic anhydride derived moieties being from about 1:1 to about 4:1.
Claim 26
Independent Claim
88 words
A method of dispersing a compound selected from the group of iron oxide, clay and mixtures thereof contained in an aqueous medium which would otherwise deposit on the structural parts containing said medium, which comprises introducing in said medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene to said maleic anhydride derived moieties being from about 1:1 to about 4:1.
Claim 27
Dependent Claim
58 words
A method according to claim 23, wherein the aqueous medium is the cooling medium of a cooling water system and where the polymer is added to said aqueous medium in an amount of 0.5 to 100 parts per million parts of aqueous medium, and the mole ratio of styrene to maleic anhydride is from about 1:1 to 3:1.
Claim 28
Dependent Claim
60 words
A method according to claim 23, wherein the aqueous medium is the scrubbing medium for a gaseous system containing iron oxide and where the polymer is added to said aqueous medium in an amount of 0.5 to 100 parts per million parts of aqueous medium, and the mole ratio of styrene to maleic anhydride is from about 1:1 to 3:1.
Claim 29
Dependent Claim
58 words
A method according to claim 23, wherein the aqueous medium is contained in a steam generating system and where the polymer is added to said aqueous medium in an amount of 0.5 to 100 parts per million parts of aqueous medium, and the mole ratio of the styrene to said maleic anhydride is from about 1:1 to 3:1.
Claim 30
Dependent Claim
19 words
A method according to claim 23, wherein the polymer has a molecular weight of from about 500 to 100,000.
Claim 31
Dependent Claim
24 words
A method according to claim 27, wherein the polymer is introduced in an amount of 2.5 to 25 parts per million parts of water.
Claim 32
Dependent Claim
23 words
A method according to claim 28, wherein the polymer possesses a ratio of said styrene moieties to said anhydride derived moieties of 3:1.
Claim 33
Dependent Claim
15 words
A method according to claim 29, wherein the polymer is in the sodium salt form.
Claim 34
Independent Claim
97 words
A method of controlling the formation and deposition of materials on the structural parts of a steam generating system containing an aqueous medium which in turn contains the materials or ions which would otherwise form and deposit as said materials, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 35
Independent Claim
97 words
A method of controlling the formation and deposition of materials on the structural parts of a steam generating system containing an aqueous medium which in turn contains the materials or ions which would otherwise form and deposit as said materials, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 36
Dependent Claim
30 words
A method according to claim 31, wherein the amount of polymer introduced is from about 0.5 to about 100 parts of polymer per million parts of water in said system.
Claim 37
Dependent Claim
19 words
A method according to claim 32, wherein the polymer has a molecular weight of from about 500 to 100,000.
Claim 38
Dependent Claim
23 words
A method according to claim 33, wherein the polymer possesses a ratio of said styrene moieties to said anhydride derived moieties of 3:1.
Claim 39
Dependent Claim
27 words
A method according to claim 31, wherein the polymer possesses a ratio of said styrene moieties to said anhydride derived moieties of from about 2:1 to 3:1.
Claim 40
Dependent Claim
27 words
A method according to claim 35, wherein the polymer introduced is in an amount of from about 0.5 to about 100 parts per million parts of water.
Claim 41
Dependent Claim
19 words
A method according to claim 36, wherein the polymer has a molecular weight of from about 500 to 100,000.
Claim 42
Dependent Claim
25 words
A method according to claim 37, wherein the polymer introduced is from about 2.5 to 25 parts per million parts of water in said system.
Claim 43
Dependent Claim
20 words
A method according to claim 38, wherein the polymer is in the form of the sodium salt of said polymer.
Claim 44
Independent Claim
122 words
A method of controlling the formation and deposition of at least one compound selected from the group consisting of calcium phosphate, magnesium phosphate, calcium silicate, magnesium silicate, and iron oxide and mixtures thereof on the structural parts of a steam generating system containing an aqueous medium which in turn contains ions which would otherwise lead to the formation and deposition of said compound or compounds, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 45
Independent Claim
122 words
A method of controlling the formation and deposition of at least one compound selected from the group consisting of calcium phosphate, magnesium phosphate, calcium silicate, magnesium silicate, and iron oxide and mixtures thereof on the structural parts of a steam generating system containing an aqueous medium which in turn contains ions which would otherwise lead to the formation and deposition of said compound or compounds, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 46
Dependent Claim
30 words
A method according to claim 40, wherein the amount of polymer introduced is from about 0.5 to about 100 parts of polymer per million parts of water in said system.
Claim 47
Dependent Claim
16 words
A method according to claim 41, wherein the amount is from about 2.5 to 25 parts.
Claim 48
Dependent Claim
19 words
A method according to claim 42, wherein the polymer has a molecular weight of from about 500 to 100,000.
Claim 49
Dependent Claim
27 words
A method according to claim 43, wherein the polymer possesses a ratio of said styrene moieties to said anhydride derived moieties of from about 2:1 to 3:1.
Claim 50
Dependent Claim
24 words
A method according to claim 40, wherein the polymer possesses a ratio of said styrene moieties to said anhydride derived moieties of about 3:1.
Claim 51
Dependent Claim
27 words
A method according to claim 45, wherein the polymer introduced is in an amount of from about 0.5 to about 100 parts per million parts of water.
Claim 52
Dependent Claim
19 words
A method according to claim 46, wherein the polymer has a molecular weight of from about 500 to 100,000.
Claim 53
Dependent Claim
20 words
A method according to claim 47, wherein the polymer is in the form of the sodium salt of said polymer.
Claim 54
Dependent Claim
12 words
A method according to claim 48, wherein the compound is calcium phosphate.
Claim 55
Dependent Claim
12 words
A method according to claim 40, wherein the compound is calcium phosphate.
Claim 56
Dependent Claim
16 words
A method according to claim 40, wherein the polymer has a molecular weight of about 4,000.
Claim 57
Dependent Claim
25 words
A method according to claim 51 wherein the amount of polymer introduced is from about 0.5 to about 100 parts per million parts of water.
Claim 58
Dependent Claim
26 words
A method according to claim 52, wherein the polymer possesses a ratio of said styrene moieties to said anhydride moieties of about 2:1 to about 3:1.
Claim 59
Dependent Claim
21 words
A method according to claim 53, wherein the polymer possesses a ratio of said styrene moieties to said anhydride of 3:1.
Claim 60
Dependent Claim
24 words
A method according to claim 54, wherein the polymer is introduced in an amount of 2.5 to 25 parts per million parts of water.
Claim 61
Dependent Claim
15 words
A method according to claim 55, wherein the polymer is in the sodium salt form.
Claim 62
Independent Claim
127 words
A method of controlling the formation and deposition of at least one compound selected from the group consisting of calcium carbonate, calcium sulfate, calcium phosphate, magnesium phosphate, magnesium silicate, calcium silicate, and iron oxide and mixtures thereof on the structural parts of a system containing an aqueous medium which in turn contains the compounds or ions which would otherwise lead to the formation and deposition of said compound or compounds, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 63
Independent Claim
127 words
A method of controlling the formation and deposition of at least one compound selected from the group consisting of calcium carbonate, calcium sulfate, calcium phosphate, magnesium phosphate, magnesium silicate, calcium silicate, and iron oxide and mixtures thereof on the structural parts of a system containing an aqueous medium which in turn contains the compounds or ions which would otherwise lead to the formation and deposition of said compound or compounds, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 64
Independent Claim
126 words
A method of controlling the formation and deposition of at least one compound selected from the group consisting of calcium carbonate, calcium sulfate, calcium phosphate, magnesium phosphate, calcium silicate, magnesium silicate, and iron oxide and mixures thereof on the structural parts of a steam generating system containing an aqueous medium which in turn contains ions which would otherwise lead to the formation and deposition of said compound or compounds, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 65
Independent Claim
126 words
A method of controlling the formation and deposition of at least one compound selected from the group consisting of calcium carbonate, calcium sulfate, calcium phosphate, magnesium phosphate, calcium silicate, magnesium silicate, and iron oxide and mixures thereof on the structural parts of a steam generating system containing an aqueous medium which in turn contains ions which would otherwise lead to the formation and deposition of said compound or compounds, which comprises introducing into the aqueous medium an effective amount for the purpose of a polymer or the water soluble salt of said polymer, which polymer is comprised of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 4:1.
Claim 66
Independent Claim
67 words
A method of inhibiting deposits of scale, sludge and other foulants in aqueous systems, said method consisting essentially of adding to said systems 0.05 to 100 ppm of a composition selected from the group consisting of water-soluble copolymers of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 3:1.
Claim 67
Independent Claim
67 words
A method of inhibiting deposits of scale, sludge and other foulants in aqueous systems, said method consisting essentially of adding to said systems 0.05 to 100 ppm of a composition selected from the group consisting of water-soluble copolymers of sulfonated styrene moieties and moieties derived from maleic anhydride, the ratio of said styrene moieties to said maleic anhydride derived moieties being from about 2:1 to about 3:1.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
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