Method and device for producing sulfuric acid
AssigneesThyssenkrupp Industrial Solutions AG, thyssenkrupp AG
InventorsHolger Thielert, Zion Guetta
Life of this patent
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Abstract
A process for preparing sulfuric acid may involve melting elemental sulfur in a melting stage to give molten sulfur. Sulfuric acid is subsequently produced from the molten sulfur. Further, sulfur-containing offgases formed in the melting stage may be subjected to oxidation in a supplementary oxidation stage in which sulfur-containing components of the offgases are oxidized to sulfur dioxide. The process may further involve processing the sulfur dioxide to give at least one reaction product. The melting stage may be operated without emissions by processing all of the offgases from the melting stage. An apparatus may be employed for carrying out such a process.
Claims14
A process for preparing sulfuric acid, the process comprising:
- melting elemental sulfur in a melting stage to give molten sulfur;
- producing sulfuric acid from the molten sulfur;
- subjecting offgases formed in the melting stage to oxidation in a supplementary oxidation stage in which sulfur-containing components of the offgases are oxidized to sulfur dioxide and the sulfur dioxide is processed to give a reaction product;
- oxidizing the molten sulfur to sulfur dioxide in a first oxidation stage, oxidizing the sulfur dioxide from the first oxidation stage to sulfur trioxide in a second oxidation stage, and converting the sulfur trioxide into sulfuric acid in an absorption stage;
- introducing the offgases after oxidation of the sulfur-containing offgas components together with process gas from the second oxidation stage into an intermediate absorption stage;
- and
- feeding sulfur dioxide from the offgases or from the process gas from the intermediate absorption stage into the second oxidation stage.
An apparatus for preparing sulfuric acid, the apparatus comprising:
- a melting oven for melting elemental sulfur;
- a first oxidation facility that is connected to the melting oven, wherein the first oxidation facility is configured to oxidize molten sulfur to sulfur dioxide;
- a second oxidation facility configured to oxidize the sulfur dioxide from the first oxidation facility to sulfur trioxide;
- and
- a supplementary oxidation facility connected to the melting oven, wherein offgases formed while melting the elemental sulfur are configured to be taken off from the melting oven and at least partly fed to the supplementary oxidation facility, wherein the supplementary oxidation facility is configured to oxidize sulfur-containing components of the offgases to sulfur dioxide,
- wherein the second oxidation facility is configured to oxidize the sulfur dioxide from the supplementary oxidation facility to sulfur trioxide.
Dependencies are inferred from the claim text.