LIMITS OF THE EXTENDED COOKING CONCEPT AND BLEACHABILITY OF RESULTING PULPS, 2002 Kraft Pulp Yield Anthology

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The principles of extended delignification were applied using a continuous flow reactor and the resulting pulps were compared to conventional batch pulps of a 30 kappa number for softwoods and a 20 kappa number for hardwoods. For softwoods, a kappa number 10 was achieved while maintaining a comparable viscosity of the conventional batch pulp and a kappa number 9 with a comparable pulp strength. For hardwoods, a kappa number of 6 was achieved with the continuous flow reactor while maintaining a comparable viscosity of a conventional hardwood batch pulp and a kappa number 4 with a comparable pulp strength.