Ozone based TCF bleaching of non- wood organosolv pulps

摘要

Three alkali-based organosolv pulps (alkali-sulfite-AQ-methanol (ASAM), alkali-methanol-AQ (Organocell) and Ethanol-soda) from agrofibre crop giant reed were bleached by an AZE_RQP bleaching sequence without oxygen pre-bleaching and compared with kraft pulp, as a reference. The different response on bleaching conditions was revealed for all tested pulps. The pulp bleachability in terms of brightness improvement and lignin removal was higher for Organocell pulp. The ASAM and Ethanol-soda pulps showed the higher bleaching selectivity, expressed by viscosity loss per unit of lignin removed. The overall bleaching results of organosolv pulps were superior to kraft.