US4430242A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel road and highway deicer and traction agent, and process for its manufacture
Assignee: Individual
•
Filing: 1982-08-02
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Granted: 1984-02-07
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Expires: 2002-08-02
Abstract
Abstract A process of reacting aqueous acetic acid and crushed raw limestone in such a way as to produce a mixture of calcium acetate, calcium acid-acetate, and unreacted raw limestone devoid of undesirable fine limestone. Such a product is useful in winter highway treatment, where the environmentally safe soluble acetates function to depress the freezing point of water, and the limestone acts as a roadway traction agent. When as much as 3 mols of acetic acid per mol of active calcium carbonate in limestone are used, all the limestone is consumed, with virtually 100% yield of calcium acid-acetate.
Inventors
- 👤 Alan B. Gancy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:34
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18; C09K3/185
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
A process for manufacturing a combined deicing and traction agent comprising the following steps: (a) introducing crushed raw limestone into a rotary kiln or equivalent agitated reaction vessel; (b) adding aqueous acetic acid at a concentration of 50-90% by weight to the crushed raw limestone, with agitation; (c) regulating the total relative amount of acetic acid such that the mole ratio of acid, anhydrous basis, to calcium compounds in the limestone is in the range 0.4-3.0; (d) agitating the reaction batch for a period of time sufficient to achieve substantially complete reaction; and (e) drying the damp intermediate product of said reaction in a conventional manner to produce a dry, free-flowing product.
Claim 2
Dependent Claim
112 words
A process for manufacturing a combined deicing and traction agent comprising the following steps: (a) introducing crushed raw limestone into a rotary kiln or equivalent agitated reaction vessel; (b) adding aqueous acetic acid at a concentration of 50-90% by weight to the crushed raw limestone, with agitation; (c) regulating the total relative amount of acetic acid such that the mole ratio of acid, anhydrous basis, to calcium compounds in the limestone is in the range 0.4-3.0; (d) agitating the reaction batch for a period of time sufficient to achieve substantially complete reaction; and (e) drying the damp intermediate product of said reaction in a conventional manner to produce a dry, free-flowing product.
Claim 3
Dependent Claim
19 words
The process as defined in claim 1 wherein the temperature of the reactants is that of the ambient surroundings.
Claim 4
Dependent Claim
17 words
The process as defined in claim 1 wherein the aqueous acetic acid concentration is 70% by weight.
Claim 5
Dependent Claim
24 words
The process as defined in claim 1 wherein the mole ratio of acetic acid, anhydrous basis, to calcium compounds in the limestone is 3.0.
Claim 6
Dependent Claim
24 words
The process as defined in claim 1 wherein the mole ratio of acetic acid, anhydrous basis, to calcium compounds in the limestone is 1.0.
Claim 7
Dependent Claim
31 words
A method of deicing and providing traction on roads, highways or walkways comprising application, by conventional means, of the required amount of the product prepared by the process of claim 1.
Claim 8
Independent Claim
25 words
A method of deicing and providing traction on roads, highways or walkways comprising application, by conventional means, of the required amount of calcium acid acetate.
Claim 9
Independent Claim
25 words
A method of deicing and providing traction on roads, highways or walkways comprising application, by conventional means, of the required amount of calcium acid acetate.
Claim 10
Independent Claim
27 words
A method of deicing and providing traction on roads, highways or walkways comprising application, by conventional means, of the required amount of calcium acetate/calcium acid acetate mixtures.
Claim 11
Independent Claim
27 words
A method of deicing and providing traction on roads, highways or walkways comprising application, by conventional means, of the required amount of calcium acetate/calcium acid acetate mixtures.
References Cited (Backward Citations)
DE3209128A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |