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Recent advances in kraft pulping have improved the selectivity of this process and extended the degree of practical delignification. Despite these improvements, little is known of the nature of residual lignin for low kappa number kraft pulps. This paper examines the structure of residual lignin for seven conventional kraft (CK:kappa number 33-13) and six Lo-Solids â kraft pulps (LS:kappa number 29-11). The residual lignin in each of these pulps was isolated and characterized by 1 H NMR . The results of these analyses demonstrate that both the extent of delignification and the process employed influence the overall structure of residual lignin.
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