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Hydrogen peroxide

In the bleaching of kraft pulp, hydrogen peroxide is one of the chemicals applied in multi-stage processes. Alkaline conditions are required to generate the active bleaching species from H2O2, the per-hydroxyl anion. Consequently, extraction stages can be used for peroxide addition to boost the effects on extraction and brightness.

The application of H2O2 allows:
*Top brightness levels with improved brightness stability
*Optimized economy through savings in the total chemicals required
*Low residual of halogenated compounds, both in pulp (OX) and in effluent (AOX)
*Low effluent color

Hydrogen peroxide is applied as the exclusive bleaching agent in sulfite pulp brightening. In single or two-stage processes it allows bleaching to full brightness.