A new White Liquor Oxidation Technology: Experience from a recent start up at Metsa-Botnia, Kaskinen, 2006 Engineering, Pulping, & Environmental Conference

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Since the early 70’s, oxidized white liquor has been the preferred source of alkali for the O₂ delignification processes, as it is less expensive than caustic soda. The white liquor stream requires however, that the sodium sulphide be pre-oxidized into sodium thiosulfate prior to its introduction in the pulp. Commonly, air has been used as the oxidant but progressively, more sophisticated processes based on oxygen have emerged. Higher efficiency, smaller footprint, less sulphur emissions and especially lower investment & maintenance costs explain this gradual change. Today more than 40 oxygen-based systems are operating worldwide.