Method for purifying sulfuric acid solutions

Details Method for purifying sulfuric acid solutions Method for purifying sulfuric acid solutions

1990-04-04

1991-05-14

Hruskoci, Peter

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423 54, 423138, 423DIG2, 210668, 210669, 210688, 210694, 210758, 210759, 210912, C01B 1790

Patent

active

050154583

ABSTRACT:
A method is disclosed for removing iron from iron-contaminated sulfuric acid to render the sulfuric acid suitable for ion membrane processing which comprises contacting the iron-contaminated sulfuric acid with an oxidizing agent to oxidize essentially all of the iron to the +3 oxidation state, contacting the resulting iron-contaminated sulfuric acid containing oxidized iron with a complexing agent which can be citric acid, oxalic acid, and tartaric acid, with the amount of the complexing agent being sufficient to complex essentially all of the oxidized iron, and contacting the resulting iron-contaminated sulfuric acid containing the complexed iron with activated carbon to remove essentially all of the iron and produce a purified sulfuric acid solution.

REFERENCES:
patent: 3145080 (1964-08-01), Jockers et al.
patent: 4741831 (1988-05-01), Grinstead

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