Pulp and paper industry

Black Liquor Oxidation

Increase productivity with pure oxygen.

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.

How black liquor oxidation works

Application of pure oxigen converts sulphide sodium

Thiosulphate sodium and decrease calorific liquor value leading to an increased productivity in the bottleneck production recovery boilers (indirect concentrators).

S and Na recovering

Increases S and Na recovering in the green liquor.

Slide to learn about Nippon Gases over time