US4076505A
Expired / Lapsed
US
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Coal desulfurization process
Assignee: Mobil Oil AS
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Filing: 1976-11-22
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Granted: 1978-02-28
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Expires: 1996-11-22
Abstract
Abstract This invention provides an improved process for reducing the pyritic sulfur content of coal, which process involves (1) contacting finely divided coal under sink-float separation conditions with a heavy organic parting medium which contains dissolved therein a dispersant quantity of a novel type of soluble sulfanilate ionic surfactant; and (2) separating a coal float phase from the liquid medium system, and recovering coal which has a lower sulfur and ash content than the untreated raw coal.
Inventors
- 👤 Ralph M. Dessau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:25
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/005; B03B5/00; B03B5/28
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
84 words
In a process for reducing the pyritic sulfur and ash content of coal under sink-float separation conditions, the improvement which comprises ( 1) contacting finely comminuted coal with a heavy organic liquid medium having a specific gravity of at least 1.1, and having dissolved therein a dispersant quantity of ionic surfactant which is a hydrocarbyl-succinimide derivative of an aminoarylsulfonic acid salt; and (2) separating the coal float phase from the heavy organic liquid medium, and recovering coal with a reduced sulfur and ash content.
Claim 2
Dependent Claim
84 words
In a process for reducing the pyritic sulfur and ash content of coal under sink-float separation conditions, the improvement which comprises ( 1) contacting finely comminuted coal with a heavy organic liquid medium having a specific gravity of at least 1.1, and having dissolved therein a dispersant quantity of ionic surfactant which is a hydrocarbyl-succinimide derivative of an aminoarylsulfonic acid salt; and (2) separating the coal float phase from the heavy organic liquid medium, and recovering coal with a reduced sulfur and ash content.
Claim 3
Dependent Claim
24 words
A process in accordance with claim 1 wherein the finely comminuted coal has an average particle size in the range of about 10-200 mesh.
Claim 4
Dependent Claim
16 words
A process in accordance with claim 1 wherein the heavy organic liquid is a halogenated hydrocarbon.
Claim 5
Dependent Claim
38 words
A process in accordance with claim 1 wherein the quantity of ionic surfactant dissolved in the heavy organic liquid medium is in the range between about 0.01 and 5 weight percent, based on the weight of liquid medium.
Claim 6
Dependent Claim
57 words
A process in accordance with claim 1 wherein the ionic surfactant is a salt containing the following structural elements: ##STR5## wherein R is an acyclic hyrocarbyl group containing between about 5 and 1000 carbon atoms; Ar is a polyvalent aromatic radical; X is a metal or HNR' 3 cation; and R' is hyrogen or a hydrocarbyl substituent.
Claim 7
Dependent Claim
28 words
A process in accordance with claim 5 wherein the hydrocarbyl-succinimido group of the ion surfactant is at least partially in a hydrolyzed form as an acyclic amido/carboxylate structure.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |