US5376292A
Expired / Lapsed
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Deicing compositions containing ferrocyanide anticaking agents
Assignee: Cargill Inc
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Filing: 1993-05-19
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Granted: 1994-12-27
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Expires: 2013-05-19
Abstract
Abstract The invention relates to a deicing composition and a method of treating a deicing composition containing a water soluble ferrocyanide or ferricyanide salt, such as yellow prussiate of soda, where the resulting product displays a resistance to photodecomposition and the release of cyanide. The deicing composition comprises NaCl, a ferrocyanide or ferricyanide salt and a base.
Inventors
- 👤 Nancy L. Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:05
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18; C09K3/185
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
113 words
A deicing composition comprising at least about 95 weight percent sodium chloride, a base selected from the group consisting of NaOH, KOH, CaO, Ca(OH) 2 , MgO, Mg (OH) 2 , Na 2 CO 3 , K 2 CO 3 , CaCO 3 , MgCO 3 and mixtures thereof, at least about 35 ppm of a water soluble cyanide salt selected form the group consisting of a ferrocyanide salt and a ferricyanide salt, the composition comprising the base in an amount of at least about 100 ppm and for providing a 5 weight percent water solution of the deicing composition with a pH in the range of from about 9 to about 11.
Claim 2
Dependent Claim
113 words
A deicing composition comprising at least about 95 weight percent sodium chloride, a base selected from the group consisting of NaOH, KOH, CaO, Ca(OH) 2 , MgO, Mg (OH) 2 , Na 2 CO 3 , K 2 CO 3 , CaCO 3 , MgCO 3 and mixtures thereof, at least about 35 ppm of a water soluble cyanide salt selected form the group consisting of a ferrocyanide salt and a ferricyanide salt, the composition comprising the base in an amount of at least about 100 ppm and for providing a 5 weight percent water solution of the deicing composition with a pH in the range of from about 9 to about 11.
Claim 3
Dependent Claim
29 words
The composition of claim 1, wherein the water soluble cyanide salt is selected from the group consisting of sodium ferrocyanide, potassium ferrocyanide, sodium ferricyanide, potassium ferricyanide and mixtures thereof.
Claim 4
Dependent Claim
21 words
The composition of claim 1, wherein the base is selected from the group consisting of NaOH, CaO and Ca(OH) 2 .
Claim 5
Dependent Claim
61 words
The composition of claim 1 wherein the water soluble cyanide salt is selected from the group consisting of K 3 Fe(CN) 6 .y H 2 O, K 4 Fe(CN) 6 .x H 2 O, Na 3 Fe(CN) 6 .y H 2 O, Na 4 Fe(CN) 6 .x H 2 O and mixtures thereof wherein x=0 to 10 and y=0 or 1.
Claim 6
Dependent Claim
29 words
The composition of claim 4, wherein the cyanide salt is sodium ferrocyanide or potassium ferrocyanide and the deicing composition comprises from about 75 to about 125 ppm cyanide salt.
Claim 7
Dependent Claim
24 words
The composition of claim 11, wherein the base is NaOH and the NaOH comprises from about 750 to about 1000 ppm of the composition.
Claim 8
Dependent Claim
24 words
The composition of claim 11, wherein the base is CaO and the CaO comprises from about 50 to about 2000 ppm of the composition.
Claim 9
Independent Claim
138 words
A method of reducing the rate of cyanide being released from a deicing composition containing NaCl and at least about 35 ppm of a water soluble cyanide salt selected form the group consisting of a ferrocyanide salt and ferricyanide salt, wherein the deicing composition is exposed to sunlight, the method comprising blending sodium chloride, at least 35 ppm of the cyanide salt and a base selected from the group consisting of NaOH, KOH, CaO, Ca(OH) 2 , MgO, Mg(OH) 2 , Na 2 CO 3 , K 2 CO 3 , MgCO 3 , CaCO 3 and mixtures thereof, where the base is in an amount of at least about 100 ppm and for providing a 5 weight percent water solution of the deicing composition with a pH in the range of from about 9 to about 11.
Claim 10
Independent Claim
138 words
A method of reducing the rate of cyanide being released from a deicing composition containing NaCl and at least about 35 ppm of a water soluble cyanide salt selected form the group consisting of a ferrocyanide salt and ferricyanide salt, wherein the deicing composition is exposed to sunlight, the method comprising blending sodium chloride, at least 35 ppm of the cyanide salt and a base selected from the group consisting of NaOH, KOH, CaO, Ca(OH) 2 , MgO, Mg(OH) 2 , Na 2 CO 3 , K 2 CO 3 , MgCO 3 , CaCO 3 and mixtures thereof, where the base is in an amount of at least about 100 ppm and for providing a 5 weight percent water solution of the deicing composition with a pH in the range of from about 9 to about 11.
Claim 11
Dependent Claim
46 words
The method of claim 8, wherein the water soluble cyanide salt is selected from the group consisting of sodium ferrocyanide, potassium ferrocyanide, sodium ferricyanide, potassium ferricyanide and mixtures thereof and wherein the deicing composition comprises from about 35 to about 250 ppm water soluble cyanide salt.
Claim 12
Dependent Claim
30 words
The method of claim 9 wherein the deicing composition comprises at least about 95 weight percent NaCl and comprises from about 75 to about 125 ppm water soluble cyanide salt.
Claim 13
Dependent Claim
38 words
The composition of claims 1 or 3, wherein the amount of base in the deicing composition is such that the pH of a 5 weight percent water solution of the deicing composition is between about 10.6 and 11.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |