TCF bleaching for the low-Kappa-number kraft pulp of wheat straw

This study have investigated the TCF bleaching for low-kappa-number kraft pulp of wheat straw by two different bleaching sequences, and the low-kappa-number kraft pulp was produced by the one stage extending deliglification technology. The results indicated that the brightness of bleached pulp could be achieved 86.2%, and/or 86.9% (SBD), the viscosity of the pulp could be 938, and/or 851 mL/g after the AQ(P-N)P, and/or QZEYP bleaching sequences, respectively. The viscosity and brightness stability were better than those of bleached pulp by CEH. The pretreatment is quite important stage for keeping high viscosity. The higher pressure and higher temperature are necessary for delignification and brightness during hydrogen peroxide bleaching. The Ozone delignification is important and benefit for TCF bleaching.