Title
Susceptibility of selected non-wood fibrous raw materials for processing into unbleached and bleached kraft pulps
Authors
DARIUSZ DANIELEWICZ BARBARA SURMA-SLUSARSKA MAGDALENA KMIOTEK and KATARZYNA DYBKA-STEPIEN

Received February, 2, 2017
Published Volume 52 Issue 3-4 March-April
Keywords Miscanthus × giganteus, wheat straw, hemp, birch, pine, delignification, susceptibility

Abstract
The susceptibility of Miscanthus × giganteus, wheat straw and industrial hemp to delignification during the kraft pulping process was compared with that of birch and pine. The obtained pulps were then used to evaluate the susceptibility of their residual lignin to degradation during oxygen delignification and hydrogen peroxide bleaching processes. In the final part of work, the content of chromophoric moieties in the selected raw materials and in the produced unbleached pulps, as well as their susceptibility to degradation during oxygen delignification and hydrogen peroxide bleaching, was indirectly compared. The research shows that native lignin of Miscanthus × giganteus and wheat straw, as well as residual lignin and chromophoric groups in the pulps from these raw materials, is easier to degrade in typical delignification processes in comparison to those of hemp, birch and pine.