Treatment of effluents

Details Treatment of effluents Treatment of effluents

1981-03-12

1982-11-23

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423226, 423551, 423567R, 423573G, C01B 1704, C01B 1716, C01D 502

Patent

active

043605087

ABSTRACT:
Soluble thiosulphates present in aqueous redox systems comprising at least one salt of an anthraquinone di-sulphonic acid and at least one water soluble compound of metal having at least two stable oxidation states, for example a vanadate, are converted to sulphates by introducing oleum or sulphuric acid into the lower half of a vessel containing said thiosulphate containing redox solution, wherein the sulphuric acid has a concentration of from 10-98% w/w H.sub.2 SO.sub.4 and the amount of said sulphuric acid is such that the gram molecular weight ratio of sulphuric acid to thiosulphate is from 1:2 to 1:3, and thereafter separating the sulphate formed for example by using a solubility lowering technique. The process is carried out at ambient temperature and at a temperature of from 70.degree. C. up to the boiling temperature of the acidic mixture.

REFERENCES:
patent: 1102911 (1914-07-01), Hansen
patent: 2046880 (1936-07-01), Miller
patent: 3959452 (1976-05-01), Espenscheid et al.

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