US4159946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of aqueous systems
Assignee: FMC Technologies Ltd
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Filing: 1978-01-24
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Granted: 1979-07-03
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Expires: 1998-01-24
Abstract
Abstract A method of inhibiting the precipitation of scale-forming salts of calcium, magnesium, barium and strontium from aqueous systems which involves adding to the aqueous system a telomeric compound of the formula: <IMAGE> and the salt forming derivatives thereof, wherein: R11 is H, CH3, C2H5; R1 is -OX wherein X is alkyl of 1-4 carbon atoms or hydrogen; R is hydrogen, alkyl of 1-18 carbon atoms, cycloalkyl of 5-12 carbon atoms, phenyl or benzyl, and n is a positive integer of at most 100.
Inventors
- 👤 Malcolm J. Smith
- 👤 Peter Miles
- 👤 Norman Richardson
- 👤 Michael A. Finan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:26
CPC Classifications
C; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 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 scale inhibiting amount in the range of 1-200 ppm of a product comprising a telomeric compound of the formula: ##STR5## and the salt-forming derivatives thereof, wherein R 11 is H, CH 3 or C 2 H 5 , R 1 is a residue --OX wherein X is an alkyl residue having 1-4 carbon atoms or hydrogen, R is hydrogen, an alkyl residue having 1-18 carbon atoms, a cycloalkyl residue having from 5-12 carbon atoms, a phenyl residue or a benzyl residue, and n is a positive integer of at most 100.
Claim 2
Independent Claim
118 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 scale inhibiting amount in the range of 1-200 ppm of a product comprising a telomeric compound of the formula: ##STR5## and the salt-forming derivatives thereof, wherein R 11 is H, CH 3 or C 2 H 5 , R 1 is a residue --OX wherein X is an alkyl residue having 1-4 carbon atoms or hydrogen, R is hydrogen, an alkyl residue having 1-18 carbon atoms, a cycloalkyl residue having from 5-12 carbon atoms, a phenyl residue or a benzyl residue, and n is a positive integer of at most 100.
Claim 3
Dependent Claim
10 words
The method of claim 1 wherein R 11 is hydrogen.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein n is an integer less than 60.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein R 1 is OH, R 11 is hydrogen and n is an integer within the range of from 5 to 30.
Claim 6
Dependent Claim
26 words
The method of claim 1 wherein there is used a proportion of the inhibitor composition within the range of from 2 to 20 parts per million.
Claim 7
Dependent Claim
15 words
A method according to claim 1 wherein R, R 11 and X are each hydrogen.
Claim 8
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, an 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 anti-foaming agents selected from the group consisting of distearyl sebacamide, distearyl adipamide and ethylene oxide condensates thereof, fatty alcohols and ethylene oxide condensates thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |