EFFECTS OF LIGNIN CHEMISTRY OXYGEN BLEACHING PERFORMANCE, 2017PEERS

The present work is focused on understanding the chemical and structural properties of isolated lignin from wood and kraft pulp in attempt to better understand the relationship between lignin’s chemical properties and resultant oxygen delignification performance. Several hardwood samples were cooked under the same conditions with varying alkali charges to obtain unbleached pulps with kappa numbers between 19-20.  These pulps were next subjected to an oxygen stage. Both processes were evaluated for pulp quality, residual lignin, and O-stage efficiency. The oxygen bleaching stage was carried out under fixed conditions and evaluated with a HexA-corrected kappa number.  Results revealed that different hardwood species demonstrated varying oxygen delignification efficiency. A high correlation with O-stage efficiency and the content of phenolic hydroxyl groups was found, verifying that free phenolic hydroxyl groups are the reactive site for oxygen delignification reactions. When different hardwood species were compared, HexA content was found not to influence oxygen bleaching efficiency. 

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