Claims
- 1. In a contact method under about atmospheric pressure for the manufacture of sulphur trioxide for the production of sulphuric acid from sulphur-dioxide containing gas, particularly furnace gas obtained from metallurgical processes, by oxidation of sulphur dioxide to sulphur trioxide in the presence of a catalyst and recovering the sulphur trioxide, the improvement comprising separating the sulphur dioxide from the gas and oxidizing to sulphur trioxide with oxygen supplied to the sulphur dioxide in a stoichiometric deficiency in at least one catalyst bed, said deficiency being in a molar ratio SO.sub.2 /O.sub.2 of at least 5.
- 2. A method according to claim 1, characterized in that the molar ratio SO.sub.2 /O.sub.2 is about between 9 and 11 when employing a single catalyst bed.
- 3. A method according to claim 1 or 2, characterized in that nonoxidized sulphur dioxide is recirculated.
- 4. A method according to any of claims 1 or 2, characterized in that the sulphur dioxide is separated from the gas by utilizing a process for producing liquid sulphur dioxide.
- 5. A method according to claim 4, characterized in that at least part of the sulphur dioxide is supplied directly to the catalyst in a liquid condition.
- 6. A method according to claim 1, characterized in that the molar ratio SO.sub.2 /O.sub.2 is about between 5-7 when employing multi-beds of catalyst.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8004588 |
Jun 1980 |
SEX |
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Parent Case Info
This is a continuation of application Ser. No. 270,012 filed June 3, 1981, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (7)
Number |
Date |
Country |
469958 |
Dec 1950 |
CAX |
4745 |
Oct 1979 |
EPX |
953583 |
Dec 1949 |
FRX |
22393 |
Oct 1972 |
JPX |
103895 |
Sep 1976 |
JPX |
382967 |
|
SEX |
637585 |
May 1950 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Cathala, J., Chemie-Ing Tech. 25, No. 6, pp. 285-291, Jun. 1953, Direct Production of Sulfuric Anhydride on an Industrial Scale (Translated). |
Continuations (1)
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Number |
Date |
Country |
Parent |
270012 |
Jun 1981 |
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