Process for the brightening of sodium hydrogensulfate
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United States of America Patent
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Jun 27, 2006
Grant Date -
Apr 28, 2005
app pub date -
Aug 30, 2004
filing date -
Sep 9, 2003
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Abstract
The process for the brightening of continuously produced sodium hydrogensulfate obtained in the reaction of sodium chloride and concentrated sulfuric acid in molten sodium hydrogensulfate in a circulation reactor, wherein evolved hydrogen chloride and heating gases generated by an immersion burner are withdrawn at various sites and seed crystals are added for a faster conversion of initially formed metastable phases, is that from 0.01 to 0.05% by weight of aluminium oxide and/or from 0.5 to 1.5% by weight of magnesium oxide and/or magnesium sulfate and, optionally, additionally calcium sulfate are added as seed crystals.
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