Claims
- 1. 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.sub.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.degree. F. to 1550.degree. F., contacting said sulfur dioxide-containing off-gas and said steam with said coal in said reactor and withdrawing sulfur from said reactor.
- 2. A process for the reduction of sulfur dioxide to sulfur according to claim 1 in which said coal is granular.
- 3. 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.
- 4. 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.
- 5. 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.
- 6. The process of claim 1 wherein at least 60 percent of the sulfur dioxide is converted to sulfur.
- 7. 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.
- 8. 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.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of application Ser. No. 489,337, filed on July 17, 1974, and of application Ser. No. 279,410, filed on Aug. 10, 1972 and both now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (2)
Number |
Date |
Country |
139421 |
Oct 1948 |
AU |
775910 |
Jan 1935 |
FR |
Non-Patent Literature Citations (2)
Entry |
Averbukh, J. D., et al., "Zhurnal Prikladnoi Khimii" vol. 43, No. 2, Feb. 1970; pp. 228-236. |
Wagner; Coal & Coke; McGraw-Hill, N.Y., N.Y., 1916, pp. 186 & 258. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
489337 |
Jul 1974 |
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