Treatment of effluents

Patent · Tue Nov 23 04:00:00 EST 1982

OSTI ID:6797644

Clough, P S; Farrington, F

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 h2so4 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* C. Up to the boiling temperature of the acidic mixture.

• Assignee: British Gas Corp (United Kingdom)
• Patent Number(s): US 4360508
• OSTI ID: 6797644
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
ANTHRAQUINONES
AROMATICS
CHEMICAL REACTIONS
DESULFURIZATION
GASEOUS WASTES
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PURIFICATION
QUINONES
REDOX REACTIONS
SOLUBILITY
SULFATES
SULFUR COMPOUNDS
SULFURIC ACID
THIOSULFATES
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
WASTES