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ABSTRACT
In order to explain the behavior of soda pulp in the following next oxygen stage, the molecular characteristics of the residual lignins isolated from spruce and pine wood pulps cooked to yieldB between 71.8 and 49.8% in the soda pretreatment step were examined. The revealed differences in the cross-linking density and degree of condensation correlated with the effectiveness of lignin removal from soda pulps in the oxygen stage.