Process for the brightening of sodium hydrogensulfate

Details Process for the brightening of sodium hydrogensulfate Process for the brightening of sodium hydrogensulfate

2006-06-27

2006-06-27

Silverman, Stanley S. (Department: 1754)

Chemistry of inorganic compounds

Changing color characteristic of impurity

C423S520000, C423S552000

Reexamination Certificate

active

07067094

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in a circulation reactor, wherein evolved hydrogen chloride and heating gases generated by an immersion burner are withdrawn at various sites and seed crystals are added for a faster conversion of initially formed metastable phases, is that from 0.01 to 0.05% by weight of aluminium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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DERWENT Abstract accession No. 1977-67005Y, for DE 2619811, published Sep. 1977.

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