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Figure 7: Yields of unbleached and bleached reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips

Figure 7 Yields of unbleached and bleached reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips

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Experimental conditions of two-stage oxygen delignification ISO 5269-2, and were tested for tensile index (ISO 1924-2), burst index (ISO 2758) and tear index (ISO 1974). Analyses
Experimental conditions of two-stage oxygen delignification ISO 5269-2, and were tested for tensile index (ISO 1924-2), burst index (ISO 2758) and tear index (ISO 1974). Analyses
Figure 1: Delignification degree versus NaOH charge in OO stage of reference kraft pulp and of pulps prepared from chips pre-extracted with green liquor, hot water and dilute oxalic acid pu In oxygen delignification experiments, kraft p from original beech chips (Reference), pulps from pre-extracted chips with green liquor (GLE), ho ex water (WE) and d ilute oxalic acid pre- racted chips (OAE) with 10% wood weight loss and with approximate kappa number of 17 were used. The d de de prior to oxygen d NaOH charge (Fig. increased more in and OA _pre-ex effectiveness of oxygen d eligni ded b eligni ignification divi racted fication degree (in %) fined as the kappa number drop during oxygen y initial kappa number fication increased with 1). The delignification degree the case of the pulps from W chips. The same elignification of these pulps was achieved at lower NaOH charge in comparison delignification degree in t with the reference pulp, the his case was higher at the same NaOH charge. A delignification degree of 50% was reached for t OA pre-extracted chips wit he pulp prepared from h 0.9% NaOH charge,
Figure 1: Delignification degree versus NaOH charge in OO stage of reference kraft pulp and of pulps prepared from chips pre-extracted with green liquor, hot water and dilute oxalic acid pu In oxygen delignification experiments, kraft p from original beech chips (Reference), pulps from pre-extracted chips with green liquor (GLE), ho ex water (WE) and d ilute oxalic acid pre- racted chips (OAE) with 10% wood weight loss and with approximate kappa number of 17 were used. The d de de prior to oxygen d NaOH charge (Fig. increased more in and OA _pre-ex effectiveness of oxygen d eligni ded b eligni ignification divi racted fication degree (in %) fined as the kappa number drop during oxygen y initial kappa number fication increased with 1). The delignification degree the case of the pulps from W chips. The same elignification of these pulps was achieved at lower NaOH charge in comparison delignification degree in t with the reference pulp, the his case was higher at the same NaOH charge. A delignification degree of 50% was reached for t OA pre-extracted chips wit he pulp prepared from h 0.9% NaOH charge,
Figure 2: Hexenuronic acids content of reference kraft pulp and of pulps from chips pre-extracted with green liquor, hot water and dilute oxalic acid versus NaOH charge in OO stage
Figure 2: Hexenuronic acids content of reference kraft pulp and of pulps from chips pre-extracted with green liquor, hot water and dilute oxalic acid versus NaOH charge in OO stage
Figure 3: Brightness of reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips versus kappa factor in D)(EO)D, sequence
Figure 3: Brightness of reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips versus kappa factor in D)(EO)D, sequence
Figure 5: Hexenuronic acids content versus brightness of reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips bleached with the Dp((EO)D,D» sequence
Figure 5: Hexenuronic acids content versus brightness of reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips bleached with the Dp((EO)D,D» sequence
Figure 4: Brightness of reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips versus kappa factor in Do(EO)D,D, sequence
Figure 4: Brightness of reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips versus kappa factor in Do(EO)D,D, sequence
Figure 6: Brightness reversion versus brightness of reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips bleached with the Do(EO)D,D, sequence
Figure 6: Brightness reversion versus brightness of reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips bleached with the Do(EO)D,D, sequence
Figure 8: Drainage resistance versus beating time of bleached reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre- extracted chips
Figure 8: Drainage resistance versus beating time of bleached reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre- extracted chips
Figure 9: Tensile index versus drainage resistance of bleached reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre- extracted chips
Figure 9: Tensile index versus drainage resistance of bleached reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre- extracted chips
Figure 11: Tear index versus drainage resistance of bleached reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips Figure 10: Burst index versus drainage resistance of bleached reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre- extracted chips
Figure 11: Tear index versus drainage resistance of bleached reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre-extracted chips Figure 10: Burst index versus drainage resistance of bleached reference kraft pulp and of pulps prepared from green liquor, hot water and dilute oxalic acid pre- extracted chips
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