US4732669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conditioner for flotation of coal
Assignee: Dow Chemical Co
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Filing: 1986-07-21
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Granted: 1988-03-22
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Expires: 2006-07-21
Abstract
Abstract The froth flotation of coal is conducted in the presence of a conditioner of the condensate of naphthenic acid and an alkanolamine such as diethanolamine.
Inventors
- 👤 Kenneth H. Nimerick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:04
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/001; B03D1/004; B03D1/006; B03D1/008; B03D1/01; B03D2201/00; B03D2201/04; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
54 words
A method for recovering coal which comprises the steps of floating coal in an aqueous frothing medium containing an amount of a condensation product of an alkanolamine and naphthenic acid. sufficient to increase the recovery of coal as compared to the recovery of coal in an identical proces using none of said condensation product.
Claim 2
Independent Claim
54 words
A method for recovering coal which comprises the steps of floating coal in an aqueous frothing medium containing an amount of a condensation product of an alkanolamine and naphthenic acid. sufficient to increase the recovery of coal as compared to the recovery of coal in an identical proces using none of said condensation product.
Claim 3
Dependent Claim
94 words
The method of claim 1 wherein the alkanolamine comprises an alkanolamine of the formula: (R.sub.3)(R.sub.2)N(R.sub.1) wherein R 1 is a β-hydroxyalkyl group or inertly substituted β-hydroxyalkyl group having from 2 to 5 carbon atoms; and R 2 and R 3 are independently R 1 , hydrogen, an alkyl group of from 1 to 4 carbon atoms or a monovalent group corresponding to the formula: (R.sub.4)(R.sub.5)N(CH.sub.2)y- wherein y is an integer of 2 or 3 and R 4 and R 5 are independently R.sub. 1, hydrogen, or alkyl having from 1 to 4 carbon atoms.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein the alkanolamine(s) bear only hydroxyethyl and ethylene moieties.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein the alkanolamine comprises diethanolamine, triethanolamine or di- tri- or tetra(hydroxyethyl)-ethylenediamine.
Claim 6
Dependent Claim
31 words
The method of claim 1 wherein the naphthenic acid/alkanolamine condensate is prepared by reacting from at least about 1 to about 5 moles of naphthenic acid for each mole of alkanolamine.
Claim 7
Dependent Claim
32 words
The method of claim 5 wherein the alkanolamine comprises diethanolamine and the condensate is prepared from about 1.9 to about 2.25 moles of the naphthenic acids for each mole of the alkanolamine.
Claim 8
Dependent Claim
12 words
The method of claim 1 wherein the coal has an oxidized surface.
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein the aqueous frothing medium contains a fuel oil collector/conditioner.
Claim 10
Dependent Claim
32 words
The method of claim 8 wherein from about 0.02 to about 2.5 kilograms of the fuel oil are employed per ton of coal flotation feed (as calculated on a dry weight basis).
Claim 11
Dependent Claim
25 words
The method of claim 8 wherein the aqueous frothing medium further contains a condensate of an alkanolamine and a fatty acid or fatty acid ester.
Claim 12
Dependent Claim
54 words
The method of claim 10 wherein the naphthenic acid/alkanolamine condensate is employed in an amount of from about 10 to about 70 weight percent and the fatty acid/alkanolamine condensate employed in an amount of from about 30 to about 90 weight percent based on the weight of the naphthenic acid/alkanolamine and fatty acid/alkanolamine condensates.
Claim 13
Dependent Claim
14 words
The method of claim 8 wherein the aqueous frothing medium further comprises a frother.
Claim 14
Dependent Claim
30 words
The method of claim 12 wherein the frother is employed in an amount of from about 0.05 to about 0.5 kilogram frother per ton of coal feed (dry weight basis).
Claim 15
Dependent Claim
40 words
The method of claim 13 wherein the frother is methyl isobutyl carbinol or a polypropylene methyl ether having a weight average molecular weight between about 200 and about 600, or the reaction product of C 4-6 alcohols and propylene oxide.
Claim 16
Dependent Claim
43 words
The method of claim 13 wherein the frother is the reaction product of sucrose; or a monosaccharide, disaccharide, C 1-20 alkane or C 3-20 cycloalkane having three or more hydroxy groups with propylene oxide or a mixture of propylene oxide and ethylene oxide.
Claim 17
Independent Claim
42 words
A method of recovering coal which comprises the steps of floating coal in an aqueous frothing medium containing from about 0.001 to about 1.0 kilogram per ton of a coal flotation feed of a condensation product of an alkanolamine and naphthenic acid.
Claim 18
Independent Claim
42 words
A method of recovering coal which comprises the steps of floating coal in an aqueous frothing medium containing from about 0.001 to about 1.0 kilogram per ton of a coal flotation feed of a condensation product of an alkanolamine and naphthenic acid.
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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) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |