US4117214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for reducing the strength of ice
Assignee: Dow Chemical Co
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Filing: 1977-11-28
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Granted: 1978-09-26
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Expires: 1997-11-28
Abstract
Abstract The strength of ice is reduced by dissolving in water prior to freezing a composition of (A) a water-soluble polyhydroxy compound or monoalkylether thereof and (B) a water-soluble organic nonvolatile compound having a hydrophilic group such as amine, carboxyl or carboxylate groups in an amount to provide an effective amount, e.g., on the order of about 0.25-5 weight percent, of (A) plug (B) based on the weight of water. The method is especially useful for application to particulate solids, such as coal and mineral ores, which are shipped and stored in masses exposed to freezing temperatures. Any ice that is formed is physically weak and will not deter the unloading of the thusly conditioned particulate solids.
Inventors
- 👤 Christ F. Parks
- 👤 Kenneth H. Nimerick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:50
CPC Classifications
F; F25; F25C; F25C1/00; C; C10; C10L; C10L9/00; C10L9/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
96 words
A method for reducing the strength of ice wherein (1) an effective amount of a strength reducing composition is dissolved in the water prior to freezing, said composition consisting essentially of water soluble components comprising (A) a water soluble polyhydroxy compound selected from the group consisting of alkylene glycols and (B) from about 0.001 to about 2 parts sodium acetate per part of polyhydroxy compound, said composition being substantially free of corrosion inducing metal halide salts, and (2) the so formed solution is thereafter exposed to a temperature sufficiently low to freeze the so formed solution.
Claim 2
Independent Claim
96 words
A method for reducing the strength of ice wherein (1) an effective amount of a strength reducing composition is dissolved in the water prior to freezing, said composition consisting essentially of water soluble components comprising (A) a water soluble polyhydroxy compound selected from the group consisting of alkylene glycols and (B) from about 0.001 to about 2 parts sodium acetate per part of polyhydroxy compound, said composition being substantially free of corrosion inducing metal halide salts, and (2) the so formed solution is thereafter exposed to a temperature sufficiently low to freeze the so formed solution.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein components (A) and (B) are employed in a combined amount of at least about 0.5 percent by weight of water.
Claim 4
Independent Claim
108 words
A method for reducing the strength of ice wherein (1) an effective amount of a strength reducing composition is dissolved in the water prior to freezing, said composition consisting essentially of water soluble components comprising (A) a water soluble polyhydroxy compound selected from the group consisting of alkylene glycols and (B) polyacrylamide having at least 10 percent hydrolysis, in an amount of from about 0.001 to about 2 parts partially hydrolyzed polyacrylamide per part of polyhydroxy compound, said composition being substantially free of corrosion inducing metal halide salts, and (2) the so formed solution is thereafter exposed to a temperature sufficiently low to freeze the so formed solution.
Claim 5
Independent Claim
108 words
A method for reducing the strength of ice wherein (1) an effective amount of a strength reducing composition is dissolved in the water prior to freezing, said composition consisting essentially of water soluble components comprising (A) a water soluble polyhydroxy compound selected from the group consisting of alkylene glycols and (B) polyacrylamide having at least 10 percent hydrolysis, in an amount of from about 0.001 to about 2 parts partially hydrolyzed polyacrylamide per part of polyhydroxy compound, said composition being substantially free of corrosion inducing metal halide salts, and (2) the so formed solution is thereafter exposed to a temperature sufficiently low to freeze the so formed solution.
Claim 6
Dependent Claim
26 words
The method of claim 3 wherein components (A) and (B) are employed in a combined amount of at least about 0.5 percent by weight of water.
Claim 7
Independent Claim
94 words
A method for treating particulate solids having surface moisture to reduce the cohesive strength of masses of such solids when frozen, said particulate solids being neither water soluble nor water swellable, said method consisting of spraying such solids with an effective amount of a fluid composition consisting essentially of water soluble components comprising (A) a water soluble polyhydroxy compound selected from the group consisting of alkylene glycols and (B) from about 0.001 to about 2 parts sodium acetate per part of polyhydroxy compound, said composition being substantially free of corrosion inducing metal halide salts.
Claim 8
Independent Claim
94 words
A method for treating particulate solids having surface moisture to reduce the cohesive strength of masses of such solids when frozen, said particulate solids being neither water soluble nor water swellable, said method consisting of spraying such solids with an effective amount of a fluid composition consisting essentially of water soluble components comprising (A) a water soluble polyhydroxy compound selected from the group consisting of alkylene glycols and (B) from about 0.001 to about 2 parts sodium acetate per part of polyhydroxy compound, said composition being substantially free of corrosion inducing metal halide salts.
Claim 9
Dependent Claim
35 words
The method claimed in claim 5 wherein said composition is applied to said solids in an amount of at least 0.5 weight percent of (A) plus (B) based on the surface moisture on the solids.
Claim 10
Dependent Claim
22 words
The method claimed in claim 5 wherein said particulate solids are coal having a particle size of less than about 2 inches.
Claim 11
Independent Claim
111 words
A method for treating particulate solids having surface moisture to reduce the cohesive strength of masses of such solids when frozen, said particulate solids being neither water soluble nor water swellable, said method consisting of spraying such solids with an effective amount of a fluid composition consisting essentially of water soluble components comprising (A) a water soluble polyhydroxy compound or monoalkyl ether thereof and (B) polyacrylamide having at least 10 percent hydrolysis, in an amount of from about 0.001 to about 2 parts partially hydrolyzed polyacrylamide per part of component (A), said compound (B) being different from said compound (A), and said composition being substantially free of corrosion-inducing metal halide salts.
Claim 12
Independent Claim
111 words
A method for treating particulate solids having surface moisture to reduce the cohesive strength of masses of such solids when frozen, said particulate solids being neither water soluble nor water swellable, said method consisting of spraying such solids with an effective amount of a fluid composition consisting essentially of water soluble components comprising (A) a water soluble polyhydroxy compound or monoalkyl ether thereof and (B) polyacrylamide having at least 10 percent hydrolysis, in an amount of from about 0.001 to about 2 parts partially hydrolyzed polyacrylamide per part of component (A), said compound (B) being different from said compound (A), and said composition being substantially free of corrosion-inducing metal halide salts.
Claim 13
Dependent Claim
35 words
The method claimed in claim 8 wherein said composition is applied to said solid in an amount of at least 0.5 weight percent of (A) plus (B) based on the surface moisture on the solids.
Claim 14
Dependent Claim
22 words
The method claimed in claim 8 wherein said particulate solids are coal having a particle size of less than about 2 inches.
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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) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |