Patent US4606818A successfully refreshed from Google Patents.
US4606818A
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Modified alcohol frothers for froth flotation of coal
Assignee: Zinkan Enterprises Inc
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Filing: 1985-01-25
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Granted: 1986-08-19
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Expires: 2005-01-25
Abstract
Abstract Disclosed is an improved froth flotation process wherein solid coal particles are selectively separated under coal froth flotation conditions as a froth phase from remaining solid feed particles as an aqueous phase in the presence of a coal particle collector (e.g. a fuel oil), optionally a promoter, and an alcohol frother. The improvement in the present invention is characterized by the alcohol frother comprising the reaction product of a C 4 -C 10 diol and a compound selected from the group consisting of an alkylene oxide and an acrylonitrile. The resulting frothing agent has at least one hydroxyl group and provides greater coal recovery than use of the diol as the frothing agent.
Inventors
- 👤 Robert O. Keys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:32
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/001; B03D1/004; B03D1/006; B03D1/008; B03D1/01; B03D2201/00; B03D2201/02; B03D2201/04; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
121 words
In a froth flotation process wherein solid coal particles are selectively separated under coal froth flotation conditions as a froth phase from remaining solid feed particles as an aqueous phase in the presence of a coal particle collector and an alcohol frother, the improvement characterized by said alcohol frother comprising the reaction product of a C 5 -C 10 diol and a compound selected from the group consisting of: (a) between about 2 and 10 moles of an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, and mixtures thereof, and (b) an acrylonitrile, the resulting frothing agent having at least one hydroxyl group and providing greater coal recovery than use of said diol as the frothing agent.
Claim 2
Dependent Claim
121 words
In a froth flotation process wherein solid coal particles are selectively separated under coal froth flotation conditions as a froth phase from remaining solid feed particles as an aqueous phase in the presence of a coal particle collector and an alcohol frother, the improvement characterized by said alcohol frother comprising the reaction product of a C 5 -C 10 diol and a compound selected from the group consisting of: (a) between about 2 and 10 moles of an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, and mixtures thereof, and (b) an acrylonitrile, the resulting frothing agent having at least one hydroxyl group and providing greater coal recovery than use of said diol as the frothing agent.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said alkylene oxide comprises propylene oxide.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein said frother comprises the reaction product of 2,2,4-trimethyl-1,3-pentanediol and propylene oxide.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein said frother is used in a dosage ranging from between about 0.05 to about 0.50 g/kg of coal.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein said frother comprises the reaction product of a C 5 -C 10 diol and an acrylonitrile.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein said diol is selected from the group consisting of 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, 1,6-hexanediol, neopentyl glycol, and mixtures thereof.
Claim 8
Dependent Claim
22 words
The process of claim 1 wherein said diol is selected from the group of 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, 1,6-hexanediol, neopentyl glycol, and mixtures thereof.
Claim 9
Dependent Claim
10 words
The process of claim 7 wherein said diol comprises 2,2,4-trimethyl-1,3-pentanediol.
Claim 10
Dependent Claim
118 words
In a froth flotation process wherein solid coal particles are selectively separated under coal froth flotation conditions as a froth phase from remaining solid feed particles as an aqueous phase in the presence of a fuel oil collector and an alcohol frother, the improvement characterized by said alcohol frother comprising the reaction product of a C 5 -C 10 diol and a compound selected from: (a) between about 2 and 10 moles of an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, and mixtures thereof; and; (b) an acrylonitrile, the resulting frothing agent having at least one hydroxyl group and providing greater coal recovery than the use of said diol as the frothing agent.
Claim 11
Dependent Claim
118 words
In a froth flotation process wherein solid coal particles are selectively separated under coal froth flotation conditions as a froth phase from remaining solid feed particles as an aqueous phase in the presence of a fuel oil collector and an alcohol frother, the improvement characterized by said alcohol frother comprising the reaction product of a C 5 -C 10 diol and a compound selected from: (a) between about 2 and 10 moles of an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, and mixtures thereof; and; (b) an acrylonitrile, the resulting frothing agent having at least one hydroxyl group and providing greater coal recovery than the use of said diol as the frothing agent.
Claim 12
Dependent Claim
36 words
The process of claim 9 wherein said frother comprises the reaction product of a C 4 -C 10 diol selected from the group of 2,2,4-trimethyl-1,3-pentane diol, 2-ethyl-1,3-hexanediol, 1,6-hexanediol, neopentyl glycol, and mixtures thereof, and an acrylonitrile.
Claim 13
Dependent Claim
12 words
The process of claim 9 wherein said alkylene oxide is propylene oxide.
Claim 14
Dependent Claim
22 words
The process of claim 11 wherein said diol is selected from the group of 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, 1,6-hexanediol, neopentyl glycol, and mixtures thereof.
Claim 15
Dependent Claim
10 words
The process of claim 11 wherein said diol is 2,2,4-trimethyl-1,3-pentanediol.
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) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |