US4632750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coal beneficiation by froth flotation employing pretreated water
Assignee: Standard Oil Co
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Filing: 1985-09-20
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Granted: 1986-12-30
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Expires: 2005-09-20
Abstract
Abstract A process for the beneficiation of coal by froth flotation comprising surface treating particulate coal with a polymerizable monomer, a polymerization catalyst and a liquid organic carrier thereby rendering said particulate coal hydrophobic and oleophilic and introducing said surface treated particulate coal to a froth flotation vessel containing a water wash medium thereby resulting in a froth phase and an aqueous phase, the improvement comprising pre-treating said water wash medium prior to introducing said surface treated particulate coal with an organic carboxylic acid.
Inventors
- 👤 Phillip E. McGarry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:50
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03D1/001; B03D1/004; B03D1/008; B03D1/01; B03D1/016; B03D2203/00; B03D2203/02; B03D2203/04; B03D2203/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
In a process for the beneficiation of coal by froth flotation comprising surface treating particulate coal with a polymerizable monomer, a polymerization catalyst and a liquid organic carrier thereby rendering said particulate coal hydrophobic and oleophilic and introducing said surface treated particulate coal to a froth flotation vessel containing a water wash medium thereby resulting in a froth phase and an aqueous phase, the improvement comprising pre-treating said water wash medium prior to introducing said surface treated particulate coal with an organic carboxylic acid or alkalai metal or ammonium salt thereof.
Claim 2
Dependent Claim
91 words
In a process for the beneficiation of coal by froth flotation comprising surface treating particulate coal with a polymerizable monomer, a polymerization catalyst and a liquid organic carrier thereby rendering said particulate coal hydrophobic and oleophilic and introducing said surface treated particulate coal to a froth flotation vessel containing a water wash medium thereby resulting in a froth phase and an aqueous phase, the improvement comprising pre-treating said water wash medium prior to introducing said surface treated particulate coal with an organic carboxylic acid or alkalai metal or ammonium salt thereof.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said organic carboxylic acid is a monocarboxylic acid or a discarboxylic acid or salt thereof.
Claim 4
Dependent Claim
41 words
The process of claim 1 wherein the organic carboxylic acid or salt thereof is employed in the water wash medium in an amount from about 10% excess to about 50% excess of the stoichiometric amount necessary to remove the undesired cations.
Claim 5
Dependent Claim
52 words
The process of claim 1 wherein said organic carboxylic acid or salt thereof has the general formula: ##STR4## wherein R is an organic radical having at least 6 carbon atoms, n is an integer of at least 1 and R' is selected from the group consisting of hydrogen, alkali metal and ammonium.
Claim 6
Dependent Claim
24 words
The process of claim 4 wherein R is a saturated or ethylenically unsaturated hydrocarbyl radical having from about 6 to about 25 carbon atoms.
Claim 7
Dependent Claim
45 words
The process of claim 4 wherein said organic carboxylic acid or salt thereof is selected from the group consisting of oleic acid, palmitic acid, stearic acid, tall oil, linoleic acid, linolenic acid, ricinoleic acid and humic acid or the alkali metal or ammonium salts thereof.
Claim 8
Dependent Claim
16 words
The process of claim 6 wherein said organic carboxylic acid is tall oil or oleic acid.
Claim 9
Dependent Claim
21 words
The process of claim 7 wherein said organic carboxylic acid salt is ammonium oleate or the ammonium salt of tall oil.
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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) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |