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® kraft pulps (LS:kappa number 29-11). The residual lignin in each of these pulps was isolated and characterized by 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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机译：牛皮纸制浆的最新进展提高了该方法的选择性，并扩大了实际脱木素的程度。尽管有这些改进，但对于低卡伯牛皮纸浆的残余木质素的性质知之甚少。本文研究了七个常规牛皮纸（CK：kappa编号33-13）和六个Lo-Solids®牛皮纸浆（LS：kappa编号29-11）的残留木质素结构。分离出每个纸浆中的残留木质素，并通过1 H NMR进行表征。这些分析的结果表明，去木质素的程度和所采用的方法都会影响残留木质素的整体结构。
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