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Utilization of spent petrochemical sulfuric acid in the production of wet-process phosphoric acid

✍ Scribed by Andrzej Chojnacki; Katarzyna Chojnacka; Henryk Górecki

Publisher
Wiley (John Wiley & Sons)
Year
2005
Tongue
English
Weight
380 KB
Volume
80
Category
Article
ISSN
0268-2575

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✦ Synopsis

Abstract

The possibility of the application of spent sulfuric acid from the petrochemical industry in wet‐process phosphoric acid technology was investigated. The effect of organic impurities in sulfuric acid from benzol acidic refining on the solubility of calcium sulfate hydrates is discussed. Solubility isotherms and regression equations for CaSO~4~–H~3~PO~4~–H~2~SO~4~–H~2~O (pure and containing impurities) systems are presented. Phase transition temperatures between dihydrate and hemihydrate calcium sulfate were determined. The difference between pure and polluted sulfuric acid systems observed is negligible over the range of typical wet‐process phosphoric acid technology parameters. It is concluded that the application of spent sulfuric acid from benzol acidic refining does not have a negative influence on the crystallization process of dihydrate calcium sulfate and therefore can be applied in wet‐process phosphoric acid technology. Copyright © 2005 Society of Chemical Industry

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