C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/84
C01B 17/96 (2006.01) B01D 53/14 (2006.01) B01D 53/52 (2006.01) C01B 17/05 (2006.01) C10G 17/06 (2006.01) C10G 17/085 (2006.01) C10K 1/08 (2006.01) C10K 1/12 (2006.01)
Patent
CA 1112423
ABSTRACT , Soluble thiosulphates present in aqueous redox systems comprising at least one salt Or 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 f of a vessel containing said thiosulphate containing redox solution wherein the sulphuric acid has a concentration of from 10 - 98% w/w H2SO4 and the amount of said sulphuric acid to 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°C up to the boiling temperature of the acidic mixture.
313187
Clough Peter S.
Farrington Frederick
British Gas Corporation
Gowling Lafleur Henderson Llp
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