Patent US4118200A successfully refreshed from Google Patents.
US4118200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for desulfurizing coal
Assignee: Cato Research Corp
•
Filing: 1977-07-08
•
Granted: 1978-10-03
•
Expires: 1997-07-08
Abstract
Abstract The desulfurization of both inorganic and organic sulfur constituents of coal by treating the coal in a liquid fused salt bath in the presence of chlorine to react the sulfur containing constituents with chlorine to form chlorides and elemental sulfur. The liquid fused salt bath is comprised of the chlorides of ferric iron, alkali metals, alkaline earth metals, ammonia, and zinc.
Inventors
- 👤 Paul R. Kruesi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:30
CPC Classifications
C; C10; C10L; C10L9/00; Y; Y10; Y10S; Y10S423/00; Y10S423/09; Y10S423/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
116 words
A process for desulfurizing coal which comprises: (a) forming a liquid fused salt bath melting below the decomposition temperature of coal comprised of chlorides selected from the group consisting of chlorides of alkali metals, alkaline earth metals, ammonia, ferric iron, and zinc; (b) introducing the coal into said liquid fused salt bath; (c) introducing into said fused salt bath chlorine from a source selected from the group consisting of elemental chlorine, and a chlorine donor selected from the group consisting of sulfur chloride, ferric chloride and cupric chloride to react the sulfur-containing components of the coal with chlorine to form elemental sulfur and chlorides; and (d) recovering the desulfurized coal from the liquid fused salt bath.
Claim 2
Dependent Claim
116 words
A process for desulfurizing coal which comprises: (a) forming a liquid fused salt bath melting below the decomposition temperature of coal comprised of chlorides selected from the group consisting of chlorides of alkali metals, alkaline earth metals, ammonia, ferric iron, and zinc; (b) introducing the coal into said liquid fused salt bath; (c) introducing into said fused salt bath chlorine from a source selected from the group consisting of elemental chlorine, and a chlorine donor selected from the group consisting of sulfur chloride, ferric chloride and cupric chloride to react the sulfur-containing components of the coal with chlorine to form elemental sulfur and chlorides; and (d) recovering the desulfurized coal from the liquid fused salt bath.
Claim 3
Dependent Claim
13 words
The process of claim 1 performed at a temperature below about 500° C.
Claim 4
Dependent Claim
14 words
The process of claim 1 performed at a temperature below about 350° C.-450° C.
Claim 5
Dependent Claim
13 words
The process of claim 1 in which chlorine is introduced as elemental chlorine.
Claim 6
Dependent Claim
13 words
The process of claim 1 in which said chlorine donor is ferric chloride.
Claim 7
Dependent Claim
13 words
The process of claim 1 in which said chlorine donor is sulfur chloride.
Claim 8
Dependent Claim
21 words
The process of claim 1 in which the salts of the liquid fused salt bath comprise ferric chloride and sodium chloride.
Claim 9
Dependent Claim
21 words
The process of claim 7 in which ammonium chloride is added as one of the salts of the liquid fused bath.
Claim 10
Dependent Claim
20 words
The process of claim 1 in which the salts of the liquid fused bath comprise ferric chloride and ammonium chloride.
Claim 11
Dependent Claim
20 words
The process of claim 1 in which the salts of the liquid fused bath comprise ammonium chloride and sodium chloride.
Claim 12
Dependent Claim
20 words
The process of claim 1 in which the salts of the liquid fused bath comprise zinc chloride and potassium chloride.
Claim 13
Dependent Claim
14 words
The process of claim 1 in which inorganic sulfur is removed from the coal.
Claim 14
Dependent Claim
14 words
The process of claim 1 in which organic sulfur is removed from the coal.
Claim 15
Dependent Claim
14 words
The process of claim 1 in which the desulfurized coal is recovered by distillation.
Claim 16
Dependent Claim
48 words
The process of claim 1 in which the salts of the fused bath are so selected that the specific gravity of the liquid fused salt bath they form is greater than the desulfurized coal and less than that of any of the common impurity materials found in coal.
References Cited (Backward Citations)
US887145A
Cited
US1502592A
Cited
US3166483A
Cited
US3226316A
Cited
US3779722A
Cited
US3878051A
Cited
US3909213A
Cited
US3998604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |