Sulfur dioxide from by-product ammonium sulfate solutions
AssigneeDavy Powergas GmbH
InventorHerbert Furkert
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Abstract
In a process of concentrating an aqueous solution of ammonium sulfate and burning resultant concentrate at 850.degree.-1250.degree.C to form a combustion gas containing SO.sub.2, the improvement which comprises: Conducting said concentrating by passing said combustion gas in direct contact with said aqueous solution of ammonium sulfate to evaporate water from said solution. If the concentrate is a slurry, it can be sent in total to the combustion step or it can be centrifuged with a recycle of mother liquor to the concentrating step. The evaporation can also be conducted so that substantially dry ammonium sulfate is obtained.
Claims8
In a process comprising the steps of concentrating a neutral aqueous solution of ammonium sulfate obtained in the synthesis of organic compounds and burning resultant concentrate at 850.degree.-1250.degree. C to form a combustion gas containing SO.sub.2 and SO.sub.3, the improvement which comprises:
- conducting said concentrating by passing said combustion gas having a temperature of 500.degree.-1100.degree. C in direct contact with said aqueous solution of ammonium sulfate to evaporate sufficient water from said solution to form solid ammonium sulfate having a moisture content of at least 3% by weight from said solution.
Dependencies are inferred from the claim text.