The data presented in Figure 1 show that all hemp pulps (Hs3-6, Hw-r, Hw-nr) are delignified with oxygen in a manner characteristic of this process, i.e. with a relatively large amount of lignin removed from the pulp in the initial stage and sig- nificantly lower amounts removed in the second. The pattern of the delignification of pulps obtained from hemp stalks (Hs3- 6) and wood (Hw) is similar to that of the delignification of birch pulp (B).
Figure 2 shows comparative yields of oxygen-delignified pulps obtained from hemp and tree wood pulps.
Analysis of Figure 2 reveals that pulps derived from hemp wood (Hw-nr, Hw-r) have a yield comparable to that of birch pulp, i.e. approximately 96%, when del- ignified to a kappa number of 10 - 12. A slightly higher yield (approx. 1%) was obtained from hemp stalks (Hs3-6) of similar kappa numbers.
The data presented in Figure 1 show that all hemp pulps (Hs3-6, Hw-r, Hw-nr) are delignified with oxygen in a manner characteristic of this process, i.e. with a relatively large amount of lignin removed from the pulp in the initial stage and sig- nificantly lower amounts removed in the second. The pattern of the delignification of pulps obtained from hemp stalks (Hs3- 6) and wood (Hw) is similar to that of the delignification of birch pulp (B).
Figure 2 shows comparative yields of oxygen-delignified pulps obtained from hemp and tree wood pulps.
Analysis of Figure 2 reveals that pulps derived from hemp wood (Hw-nr, Hw-r) have a yield comparable to that of birch pulp, i.e. approximately 96%, when del- ignified to a kappa number of 10 - 12. A slightly higher yield (approx. 1%) was obtained from hemp stalks (Hs3-6) of similar kappa numbers.
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