Sulfuric Acid → Sodium Sulfate

HRID 275242

Reaction equation

[Cr:1]([O-:5])([O-:4])(=[O:3])=[O:2].[Na+:6].[Na+].[S:8](=[O:12])(=[O:11])([OH:10])[OH:9]>>[O-:2][Cr:1]([O:5][Cr:1]([O-:4])(=[O:3])=[O:2])(=[O:4])=[O:3].[Na+:6].[Na+:6].[S:8]([O-:12])([O-:11])(=[O:10])=[O:9].[Na+:6].[Na+:6]

Participants

Reactant 2

HCID 1118Sulfuric Acid

HCID 24488Sodium Chromate

Product 2

HCID 24436Sodium Sulfate

HCID 25408Sodium Dichromate

Procedure

In a first process wherein sodium chromate is reacted with aqueous sulfuric acid to produce an aqueous solution of sodium bichromate and solid sodium sulfate contaminated with hexavalent chromium, and said solid sodium sulfate is separated from said solution, and in a second process wherein said sodium bichromate is reacted with aqueous sulfuric acid to produce chromic acid, which precipitates, and an aqueous solution of sodium bisulfate contaminated with hexavalent chromium, the improvement comprising

Sources & evidence

ORD record: ord-b12c629039444b3dabbfa548830ce306
Source dataset: uspto-grants-1995_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US05393503

Linked notes

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