US4046707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of aqueous systems
Assignee: FMC Technologies Ltd
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Filing: 1975-05-29
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Granted: 1977-09-06
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Expires: 1995-05-29
Abstract
Abstract A method of inhibiting the precipitation of scale-forming salts of calcium, magnesium, barium and strontium from aqueous systems comprising adding to the aqueous system a telomeric compound of the formula: ##STR1## or salts thereof, wherein R 11 is hydrogen, methyl or ethyl, R is hydrogen, 1-18C alkyl, 5-12C cycloalkyl, aryl, aralkyl, a residue of formula: ##STR2## wherein R 11 has its previous significance and the sum of n + m is an integer of at most 100, or a residue --OX wherein X is hydrogen or 1-4C alkyl, and R 1 is a residue --OX wherein X has its previous significance.
Inventors
- 👤 Malcolm John Smith
- 👤 Peter Miles
- 👤 Norman Richardson
- 👤 Michael Anthony Finan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:28
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/167; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
A method of inhibiting the precipitation of the scale forming salts of calcium, magnesium, barium and strontium from aqueous systems comprising adding to the aqueous system a minor but effective scale-inhibiting amount of a product comprising a telomeric compound of the formula: ##STR7## or salts thereof, wherein R 11 is hydrogen of a methyl or ethyl residue, R is a residue of formula: ##STR8## wherein R 11 has its previous significance, and the sum of n + m is an integer of at most 100, and R 1 is OH.
Claim 2
Independent Claim
90 words
A method of inhibiting the precipitation of the scale forming salts of calcium, magnesium, barium and strontium from aqueous systems comprising adding to the aqueous system a minor but effective scale-inhibiting amount of a product comprising a telomeric compound of the formula: ##STR7## or salts thereof, wherein R 11 is hydrogen of a methyl or ethyl residue, R is a residue of formula: ##STR8## wherein R 11 has its previous significance, and the sum of n + m is an integer of at most 100, and R 1 is OH.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein R 11 is hydrogen and the sum of n and m is an integer within the range of 5 to 20.
Claim 4
Dependent Claim
171 words
The method of claim 1, wherein the inhibitor product is used in conjunction with an effective amount of a dispersing or threshold agent selected from the group consisting of polymerized acrylic acid and its salts, hydrolyzed polyacrylonitrile, polymerized methacrylic acid and its salts, polyacrylamide and co-polymers thereof from acrylic and methacrylic acids, lignin sulphonic acid and its salts, tannin, naphthalene sulphonic acid/formaldehyde condensation products, starch and its derivatives, and cellulose; an effective amount of a precipitating agent selected from the group consisting of alkali metal orthophosphates, alkali metal sulphites and alkali metal hydroxides; an oxygen scavenger selected from the group consisting of alkali metal sulphites and hydrazine; a sequestering agent selected from the group consisting of nitrilotriacetic acid and its salts, and ethylene diamine tetraacetic acid and salts thereof; a corrosion inhibitor selected from the group consisting of cyclohexylamine, morpholine, distearylamine/ethylene oxide condensation products and stearylamine and antifoaming agents selected from the group consisting of distearyl sebacamide, distearyl adipamide and ethylene oxide condensates thereof, fatty alcohols and ethylene oxide condensates thereof.
Claim 5
Dependent Claim
34 words
A method according to claim 1, wherein the product comprising the compound of formula I is added to the aqueous system in amounts ranging from 1 part per million to 200 parts per million.
Claim 6
Dependent Claim
25 words
The method according to claim 4, wherein the compound is added to the aqueous system in amounts ranging from 2 to 20 parts per million.
References Cited (Backward Citations)
US2957931A
Cited
US3159537A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |