US4147762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of SO2 with coal
Assignee: Foster Wheeler Energy Corp
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Filing: 1975-11-26
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Granted: 1979-04-03
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Expires: 1995-11-26
Abstract
Abstract An improved process for the reduction of SO 2 is provided in which a gas containing SO 2 is contacted with granular coal in the presence of steam.
Inventors
- 👤 Peter Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:42
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/0473; C01B17/0482
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
A continuous process for the reduction of sulfur dioxide to sulfur comprising introducing steam and a sulfur dioxide-containing off-gas in a mole ratio of steam to SO 2 of from 2 to 3 into a reactor containing coal and maintained at a temperature which will convert the sulfur dioxide to sulfur, said temperature being from 1150° F. to 1550° F., contacting said sulfur dioxide-containing off-gas and said steam with said coal in said reactor and withdrawing sulfur from said reactor.
Claim 2
Dependent Claim
80 words
A continuous process for the reduction of sulfur dioxide to sulfur comprising introducing steam and a sulfur dioxide-containing off-gas in a mole ratio of steam to SO 2 of from 2 to 3 into a reactor containing coal and maintained at a temperature which will convert the sulfur dioxide to sulfur, said temperature being from 1150° F. to 1550° F., contacting said sulfur dioxide-containing off-gas and said steam with said coal in said reactor and withdrawing sulfur from said reactor.
Claim 3
Dependent Claim
20 words
A process for the reduction of sulfur dioxide to sulfur according to claim 1 in which said coal is granular.
Claim 4
Dependent Claim
23 words
The process of claim 2 wherein the contact time of the sulfur dioxide-steam mixture with the coal is from 5.1 to 9.1 seconds.
Claim 5
Dependent Claim
52 words
A continuous process for the reduction of a sulfur dioxide containing off-gas to sulfur according to claim 1, in which the input flow of said coal and the effluent flow of ash product are regulated such that a relatively high proportion of said coal is utilized for said reduction of sulfur dioxide.
Claim 6
Dependent Claim
23 words
The process of claim 4 wherein the contact time of the sulfur dioxide-steam mixture with the coal is from 5.1 to 9.1 seconds.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein at least 60 percent of the sulfur dioxide is converted to sulfur.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein the contact time of the sulfur dioxide-steam mixture with the coal is from 5.1 to 9.1 seconds.
Claim 9
Dependent Claim
23 words
The process of claim 1 wherein the contact time of the sulfur dioxide-steam mixture with the coal is from 5.1 to 9.1 seconds.
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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |