Bleaching of bisulfite pulp with high fraction of residual lignin was studied. Bleaching was performed using two oxidants: hydrogen peroxide in acid medium in the delignification stage and sodium chlorite in the final bleaching. Oxidative degradation of the pulp and chemical loss of the fiber are quite moderate in the process, and changes in the fiber size and mechanical properties of the pulp are insignificant. This technology ensures high degree of deresinification with respect to total and “harmful” resins, i.e., it eliminates “resin problems” in production of paper and cardboard.
Russian Journal of Applied Chemistry – Springer Journals
Published: Dec 30, 2014
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