Patent US4253944A successfully refreshed from Google Patents.
US4253944A
Expired / Lapsed
US
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Conditioner for flotation of oxidized coal
Assignee: Dow Chemical Co
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Filing: 1979-12-28
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Granted: 1981-03-03
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Expires: 1999-12-28
Abstract
Abstract Certain condensation products of a fatty acid or fatty acid ester and a hydroxyalkylated alicyclic nitrogen-containing compound are useful as conditioners to improve the recovery of clean coal in a froth flotation process. The presence of these condensation products in the flotation medium is particularly effective to enhance the recovery of oxidized bituminous coal.
Inventors
- 👤 Robert E. Hefner, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:09
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/01; B03D1/006; B03D1/02; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
A froth flotation process for beneficiating coal which comprises floating coal particles of flotation size in a frothing aqueous medium in the presence of a fuel oil collector and an effective amount of a condensation product of a fatty acid or fatty acid ester and a compound represented by the formula I ##STR7## wherein z is 0 or 1; x is 2 or 3; T at each occurrence is independently hydrogen, ethyl or methyl; Y is hydrogen or ##STR8## R is ##STR9## wherein R' is hydrogen or a C 1 -C 20 aliphatic radical and R" is hydrogen or ##STR10## in which z, x, T and Y have the aforementioned meanings; said condensation product being prepared using a molar ratio of at least about one mole of fatty acid or ester for each mole of the compound of formula I and said condensation product being employed in its free form or as an acid derivative.
Claim 2
Dependent Claim
155 words
A froth flotation process for beneficiating coal which comprises floating coal particles of flotation size in a frothing aqueous medium in the presence of a fuel oil collector and an effective amount of a condensation product of a fatty acid or fatty acid ester and a compound represented by the formula I ##STR7## wherein z is 0 or 1; x is 2 or 3; T at each occurrence is independently hydrogen, ethyl or methyl; Y is hydrogen or ##STR8## R is ##STR9## wherein R' is hydrogen or a C 1 -C 20 aliphatic radical and R" is hydrogen or ##STR10## in which z, x, T and Y have the aforementioned meanings; said condensation product being prepared using a molar ratio of at least about one mole of fatty acid or ester for each mole of the compound of formula I and said condensation product being employed in its free form or as an acid derivative.
Claim 3
Dependent Claim
18 words
The process as described in claim 1 wherein the coal is a bituminous coal having an oxidized surface.
Claim 4
Dependent Claim
21 words
The process as described in claim 1 wherein the compound of formula I, Y at one or more occurrences is ##STR11##
Claim 5
Dependent Claim
11 words
The process as described in claim 3 wherein R is ##STR12##
Claim 6
Dependent Claim
15 words
The process as described in claim 4 wherein R is ##STR13## and R" is ##STR14##
Claim 7
Dependent Claim
39 words
The process as described in claim 1 or 5 wherein in each moiety of the formula ##STR15## in the compound of formula I, T at one occurrence is hydrogen and T at the other occurrence is hydrogen or methyl.
Claim 8
Dependent Claim
17 words
The process as described in claim 1 wherein the condensation product is present in its free form.
Claim 9
Dependent Claim
19 words
The process as described in claim 1 wherein the condensation product is present as an acetic acid neutralized derivative.
Claim 10
Dependent Claim
34 words
The process as described in claim 1 or 5 wherein the fatty acid or ester is a tall oil fatty acid, tall oil heads, a tall oil fatty acid ester or a mixture thereof.
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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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |