Black liquor oxidation with pure oxygen increases productivity and reduces air pollution
Black liquors can be treated with pure oxygen to oxidise sodium sulphide up to the stable compound sodium thiosulphate. This way, it reduces emissions of total reduced sulphur (TRS) in the recovery boiler. This application can also reduce the liquor heating value and increase the recovery boiler capacity.
Oxidation
Oxidation of sulphur coumpound (mercaptans/ H2S).
TRS
TRS reduction.
Exothermic reaction
A better use of heat generated in the exothermic reaction.
Shorter reaction
Saved steam evaporators; Shorter reaction and less foam generation than with
air.
Productivity
Increased productivity 2 to 4%.
S and Na recovering
Increases S and Na recovering in the green liquor.
Slide to learn about Nippon Gases over time
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