US4071606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur dioxide with coal
Assignee: Honeywell International Inc
•
Filing: 1976-12-13
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Granted: 1978-01-31
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Expires: 1996-12-13
Abstract
Abstract A process is described for producing sulfur by the reaction of sulfur dioxide with agglomerating coal. The purity of the product gases is improved and the tendency of the coal to agglomerate is reduced by employing coal particles having a particle size below 500 microns.
Inventors
- 👤 Charles T. Ratcliffe
- 👤 Geza Pap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:16
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0404; C01B17/0456; C01B17/0473; C01B17/0482; Y; Y10; Y10S; Y10S48/00; Y10S48/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
In a process for producing sulfur by the reduction of sulfur dioxide with an agglomerating coal wherein a sulfur dioxide containing gas is passed into a bed of particles of the coal heated to a temperature of between 600° and 900° C and sulfur is recovered from the product gases leaving the bed, the improvement which comprises reducing the amount of tar in the product gases and reducing the tendency of the coal particles to agglomerate by employing coal particles having a particle size less than 500 microns.
Claim 2
Dependent Claim
88 words
In a process for producing sulfur by the reduction of sulfur dioxide with an agglomerating coal wherein a sulfur dioxide containing gas is passed into a bed of particles of the coal heated to a temperature of between 600° and 900° C and sulfur is recovered from the product gases leaving the bed, the improvement which comprises reducing the amount of tar in the product gases and reducing the tendency of the coal particles to agglomerate by employing coal particles having a particle size less than 500 microns.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the sulfur dioxide content of the gas is above 50 percent by volume.
References Cited (Backward Citations)
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Cited
US1917685A
Cited
US1954351A
Cited
US2002860A
Cited
US2884303A
Cited
US3932146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-30 | 1981-08-01 | 1982-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-30 | 1985-08-01 | 1986-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-30 | 1989-08-01 | 1990-01-31 | $7700.00 | Window Closed / Lapsed |