US3949684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for oxidation of sulfur-containing substances
Assignee: Copeland Systems Inc
•
Filing: 1975-02-11
•
Granted: 1976-04-13
•
Expires: 1995-02-11
Abstract
Abstract A method for reducing the sulfur oxide content of a gaseous effluent resulting from the oxidation of sulfur-containing materials, such as fuels, which method provides for oxidation of such materials in a fluidized bed reactor in the presence of one or more metallic oxides reactive with sulfur oxides to form metallic sulfates. The method is carried out at temperatures sufficient to effect substantial oxidation of the sulfur in sulfur-containing substances yet insufficient to melt or dissociate appreciable amounts of the metallic sulfate reaction products formed. The method is particularly useful in the oxidation of coal using an alumina bearing non-refractory clay. Gaseous sulfur oxides released in the oxidation of coal under the conditions described in the invention will combine with the alumina content of the clay to form aluminum sulfate which remains in the bed medium along with coal ash and other non-combustible materials.
Inventors
- 👤 George G. Copeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:28
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/68; C01F7/74; C01F7/743; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; C10; C10L; C10L9/00; C10L9/10; F; F23; F23C; F23C10/00; F23C10/002
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A method for oxidation of a sulfur-containing carbonaceous substance wherein the sulfur oxide content of the gaseous effluent of such oxidation is reduced, said method comprising: introducing said sulfur-containing substance to be oxidized into a reactor particle bed fluidized by a gas containing oxygen in stoichiometric excess of that required to oxidize said substance; said particle bed containing particles of an alumina-containing non-refractory clay in a quantity sufficient to provide an amount of alumina in stoichiometric excess of that required to react to form aluminum sulfate from sulfur oxides formed during oxidation of said sulfur-containing substances; and maintaining the temperature in said fluidized particle bed at from about 1200°F. to about 1400°F. whereby said sulfur-containing substances are oxidized and sulfur oxides formed in the course of such oxidation react within the reactor particle bed with the alumina to form aluminum sulfate.
Claim 2
Independent Claim
141 words
A method for oxidation of a sulfur-containing carbonaceous substance wherein the sulfur oxide content of the gaseous effluent of such oxidation is reduced, said method comprising: introducing said sulfur-containing substance to be oxidized into a reactor particle bed fluidized by a gas containing oxygen in stoichiometric excess of that required to oxidize said substance; said particle bed containing particles of an alumina-containing non-refractory clay in a quantity sufficient to provide an amount of alumina in stoichiometric excess of that required to react to form aluminum sulfate from sulfur oxides formed during oxidation of said sulfur-containing substances; and maintaining the temperature in said fluidized particle bed at from about 1200°F. to about 1400°F. whereby said sulfur-containing substances are oxidized and sulfur oxides formed in the course of such oxidation react within the reactor particle bed with the alumina to form aluminum sulfate.
Claim 3
Dependent Claim
16 words
A method according to claim 1 in which the sulfur-containing substance to be oxidized is coal.
Claim 4
Dependent Claim
16 words
A method according to claim 1 in which the sulfur-containing substance to be oxidized is lignite.
Claim 5
Dependent Claim
17 words
A method according to claim 1 in which the sulfur-containing substance to be oxidized is oil shale.
Claim 6
Dependent Claim
17 words
A method according to claim 1 in which the sulfur-containing substance to be oxidized is tar sand.
Claim 7
Dependent Claim
16 words
A method according to claim 1 in which the sulfur-containing substance to be oxidized is peat.
Claim 8
Dependent Claim
26 words
A method according to claim 1 in which aluminum sulfate and ash is withdrawn from the reactor and additional non-refractory clay is supplied to the bed.
Claim 9
Dependent Claim
30 words
A method according to claim 1 in which the sulfur-containing substance is coal and the non-refractory clay is clay commonly or naturally associated with the coal in the coal seam.
Claim 10
Independent Claim
150 words
A method for the oxidation of a sulfur-containing fuel of the group consisting of coal, fuel oil, natural gas, lignite, oil shale, tar sand and peat wherein the sulfur oxide content of the gaseous effluent resulting from such oxidation is reduced, said method comprising: introducing the fuel to be oxidized into a reactor bed of particles fluidized by a gas containing oxygen in stoichiometric excess of that required to effect oxidation of the sulfur of said fuel, said bed of particles comprising particles of alumina containing non-refractory clay in a quantity sufficient to provide a stoichiometric excess of alumina for reaction with sulfur oxides formed during oxidation of sulfur in the fuel; and maintaining the temperature in said bed of particles at from about 1200°F. to about 1400°F., whereby said fuel is oxidized and sulfur oxides formed in the course of such oxidation react with alumina to form aluminum sulfate.
Claim 11
Independent Claim
150 words
A method for the oxidation of a sulfur-containing fuel of the group consisting of coal, fuel oil, natural gas, lignite, oil shale, tar sand and peat wherein the sulfur oxide content of the gaseous effluent resulting from such oxidation is reduced, said method comprising: introducing the fuel to be oxidized into a reactor bed of particles fluidized by a gas containing oxygen in stoichiometric excess of that required to effect oxidation of the sulfur of said fuel, said bed of particles comprising particles of alumina containing non-refractory clay in a quantity sufficient to provide a stoichiometric excess of alumina for reaction with sulfur oxides formed during oxidation of sulfur in the fuel; and maintaining the temperature in said bed of particles at from about 1200°F. to about 1400°F., whereby said fuel is oxidized and sulfur oxides formed in the course of such oxidation react with alumina to form aluminum sulfate.
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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |