US4474619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conditioner for flotation of coal
Assignee: Dow Chemical Co
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Filing: 1981-10-14
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Granted: 1984-10-02
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Expires: 2001-10-14
Abstract
Abstract The froth flotation of coal in the presence of a condensate of an alkanolamine with at least about 0.8 equivalent of a fatty acid improves the separation of carbonaceous solids possessing relatively high heat value from ash and other inert mineral matter. Flotation in the presence of this condensate is particularly effective to enhance the recovery of oxidized bituminous coal.
Inventors
- 👤 Wilfred C. Meyer
- 👤 Robert D. Hansen
- 👤 Robert E. Hefner, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:06
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/01; B03D1/006; B03D1/008; B03D2201/00; B03D2201/02; B03D2201/04; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
184 words
A froth flotation process for beneficiating coal which comprises the steps of: (a) classifying the coal to separate particles of flotation size; and (b) floating the sized coal in a frothing aqueous medium comprising a fuel oil collector and an effective amount of a condensation product, or an acid derivative of the condensation product, of an alkanolamine corresponding to the formula I ##STR3## wherein R 1 is a β-hydroxyalkyl group or inertly-substituted β-hydroxyalkyl group having 2 to 5 carbon atoms; R 2 is R 1 , hydrogen, or an alkyl group of from 1 to 4 carbon atoms; and R 3 is R 1 , hydrogen, an alkyl group of from 1 to 4 carbon atoms or a monovalent group corresponding to the formula ##STR4## wherein y is an integer 2 or 3; R 4 and R 5 are independently R 1 , hydrogen or an alkyl of from 1 to 4 carbon atoms; condensed with a fatty acid or fatty acid ester in a molar ratio of at least about 0.8 mole fatty acid or fatty acid ester per mole of the alkanolamine.
Claim 2
Dependent Claim
184 words
A froth flotation process for beneficiating coal which comprises the steps of: (a) classifying the coal to separate particles of flotation size; and (b) floating the sized coal in a frothing aqueous medium comprising a fuel oil collector and an effective amount of a condensation product, or an acid derivative of the condensation product, of an alkanolamine corresponding to the formula I ##STR3## wherein R 1 is a β-hydroxyalkyl group or inertly-substituted β-hydroxyalkyl group having 2 to 5 carbon atoms; R 2 is R 1 , hydrogen, or an alkyl group of from 1 to 4 carbon atoms; and R 3 is R 1 , hydrogen, an alkyl group of from 1 to 4 carbon atoms or a monovalent group corresponding to the formula ##STR4## wherein y is an integer 2 or 3; R 4 and R 5 are independently R 1 , hydrogen or an alkyl of from 1 to 4 carbon atoms; condensed with a fatty acid or fatty acid ester in a molar ratio of at least about 0.8 mole fatty acid or fatty acid ester per mole of the alkanolamine.
Claim 3
Dependent Claim
17 words
The process as described in claim 1 wherein the coal to be beneficiated has an oxidized surface.
Claim 4
Dependent Claim
18 words
The process as described in claim 2 wherein the coal is a bituminous coal having an oxidized surface.
Claim 5
Dependent Claim
13 words
The process as described in claim 2 wherein the β-hydroxyalkyl group is β-hydroxyethyl.
Claim 6
Dependent Claim
17 words
The process as described in claim 4 wherein R 2 is hydrogen and R 3 is β-hydroxyethyl.
Claim 7
Dependent Claim
25 words
The process as described in claim 5 wherein the molar ratio of fatty acid and ester to alkanolamine is from about 1.5:1 to about 3:1.
Claim 8
Dependent Claim
33 words
The process as described in claim 4 wherein R 2 is selected from the group consisting of β-hydroxyethyl and hydrogen, and R 3 is a univalent group corresponding to the formula ##STR5## wherein
Claim 9
Dependent Claim
31 words
R 4 and R 5 are individually selected from the group consisting of β-hydroxyethyl and hydrogen, with the proviso that at least one of R 2 and R 4 is β-hydroxyethyl.
Claim 10
Dependent Claim
31 words
R 4 and R 5 are individually selected from the group consisting of β-hydroxyethyl and hydrogen, with the proviso that at least one of R 2 and R 4 is β-hydroxyethyl.
Claim 11
Dependent Claim
24 words
The process as described in claim 7 wherein the molar ratio of fatty acid and ester to alkanolamine is from about 1.5:1 to 4:1.
Claim 12
Dependent Claim
29 words
The process as described in claim 5 or 7 wherein the fatty acid or fatty acid ester is a tall oil fatty acid or a tall oil fatty ester.
Claim 13
Dependent Claim
27 words
The process as described in claim 5 wherein the coal is floated in the presence of a C 1 -C 4 monocarboxylic acid derivative of the condensate.
Claim 14
Dependent Claim
40 words
The process as described in claim 10 wherein the coal is floated in the presence of an acetic or propionic acid complex the condensate in which 0.5 mole of acetic or propionic acid is present for each mole of condensate.
Claim 15
Dependent Claim
28 words
The process as described in claim 11 wherein the fatty acid or fatty acid ester is a tall oil fatty acid or a tall oil fatty acid ester.
Claim 16
Dependent Claim
31 words
The process as described in claim 12 wherein the molar ratio of tall oil fatty acid and ester to diethanolamine in the condensation product is from about 2:1 to about 3:1.
Claim 17
Dependent Claim
22 words
The process as described in claim 2 wherein the frothing aqueous medium further comprises an effective amount of a conventional frothing agent.
Claim 18
Dependent Claim
28 words
The process as described in claim 14 wherein the frothing agent is a monomethylether of a polypropylene glycol of about 200 to about 600 weight average molecular weight.
Claim 19
Dependent Claim
21 words
The process as described in claim 14 wherein the frothing agent is at least one branched C 4 -C 8 alkanol.
Claim 20
Dependent Claim
15 words
The process as described in claim 16 wherein the frothing agent is methyl isobutyl carbinol.
References Cited (Backward Citations)
US1761546A
Cited
US2028742A
Cited
US2074699A
Cited
US2173448A
Cited
US2173909A
Cited
US2389763A
Cited
US2312414A
Cited
US2740522A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |