Polymer-Based Peroxide Stabilizer for Recycle Fiber Bleaching, 2008 Engineering, Pulping and Environmental Conference

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Silicate is a widely used peroxide bleaching enhancing agent in the pulp and paper industry. In some cases this additive can also contribute to process issues such as impacts on the wet-end of the paper machine (anionic trash), sheet properties (picking, linting, etc.), and at times scaling in the system. Thus there is industry interest in complementary stabilizers in the bleaching of recycled fiber (RCF).

Kemira has developed a novel polymer based peroxide stabilizer technology to address this need. Originally developed for use in virgin pulp bleaching, the polymer stabilizer has been adapted for use in RCF processing. In this work, research was conducted with 100% recovered old newspapers. The results show a clear synergistic effect when these polymers are introduced in the presence of silicate into the RCF bleaching system. Specifically, when The polymer was added without reducing silicate dosage the ISO brightness significantly improved. These improvements were further observed and enhanced under a variety of other conditions in which silicate was also present during the RCF processing. Extensive developmental work continues to optimize this potentially beneficial concept as it applies to RCF processing.