C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
C25B 1/26 (2006.01) B01D 53/32 (2006.01)
Patent
CA 2579364
A process and apparatus for reducing the concentration of chlorine gas in a first gaseous mixture further comprising at least one inert gas, said process comprising (a) treating said gaseous mixture with a first aqueous solution comprising a mediator compound in a first oxidation state operably substantially reducible by said chlorine to a higher and second oxidation state mediator compound to produce (i) a second aqueous solution comprising said mediator compound in said second oxidation state and chloride anion, and (ii) a second gaseous mixture of lower chlorine concentration than said first gaseous mixture; (b) treating said second solution in an electrochemical cell having an anode, cathode, and anion exchange membrane between said anode and cathode to provide an anolyte chamber and a catholyte chamber, to effect (i) substantial reduction of said mediator compound in said second oxidation state to said first oxidation state at said cathode in said catholyte chamber; (ii) passage of said chloride anion from said catholyte chamber through said anion exchange membrane into said anolyte chamber; and (iii) oxidizing said chloride anion at said anode to produce chlorine gas; and recovery of said chlorine gas. Preferably, the mediator is a metal ionic species, particularly of iron or copper. The process provides an efficacious and effective recovery of chlorine from chlorine-- contaminated gaseous mixtures, particularly, vent or tail gas from chlor-alkali production plants.
Drackett Thomas
Twardowski Zbigniew
Aker Kvaerner Canada Inc.
Chemetics Inc.
Gowan Intellectual Property
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