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C. Chirat, D. Lachenal
Addition of Fe2+ and Cu2+ cations in the Z and P stages of a ZP bleaching process causes a dramatic decrease in the viscosity of a kraft pulp. This fact is correlated with the formation of hydroxyl radicals which has been measured by E.S.R. spectroscopy and chemiluminescence. On the contrary, the addition of Mn2+ has no negative effect on viscosity and even in some cases a positive effect in Z. No hydroxyl radicals are formed with Mn2+. Large quantities of H2O2 are produced during Z. This H2O2 is readily decomposed into radical species by the metal ions present in the pulp and would be responsible for part of the viscosity loss during a high consistency Z stage.
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Beneficial and Adverse Effect of Metal Ions in ZP Bleaching Sequences, 1994 Pulping Conference Proce