Claims
- 1. In a process for removing sulfur dioxide from a gas containing oxygen and from about 0.001% to about 5% by weight of sulfur dioxide by contacting said gas with a solid sorbent in an absorption zone at a temperature of from about 300.degree. to about 500.degree. C. to form sulfate-bearing solids and a gas reduced in sulfur dioxide content, the improvement comprising the use of solid ferrous sulfate as the sorbent and maintaining a ratio of oxygen to sulfur oxides in the absorption zone of at least 1.
- 2. The process of claim 1 wherein the temperature within the absorption zone is from about 300.degree. to 400.degree. C.
- 3. The process of claim 1 wherein the gas entering the absorption zone contains sulfur dioxide, and oxygen is introduced separately into the absorption zone.
- 4. The process of claim 1 wherein the ferrous sulfate is sized into particles of maximum size of between 4 and 40 mesh and is utilized in a fluid bed reactor.
- 5. The process of claim 1 wherein the ratio of oxygen to sulfur dioxide is between about 1 to about 2.
- 6. The process of claim 1 wherein the solid ferrous sulfate used in the absorption zone is obtained by dehydrating a ferrous sulfate solution or wet crystals of ferrous sulfate to a hydrated ferrous sulfate containing water at a stoichiometric ratio to iron sulfate of from about 0.3 to about 3.0.
Parent Case Info
This is a continuation of application Ser. No 403,954, filed Oct. 5, 1973, now abandoned.
US Referenced Citations (3)
Continuations (1)
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Number |
Date |
Country |
Parent |
403954 |
Oct 1973 |
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