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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Chemical Study of Kraft Lignin during Alkaline Delignification of E. urophylla x E. grandis Hybrid in Low and High Residual Effective Alkali
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Chemical Study of Kraft Lignin during Alkaline Delignification of E. urophylla x E. grandis Hybrid in Low and High Residual Effective Alkali

机译：牛皮油在碱性脱野期间牛皮油的化学研究，尿道X X E. Grandis杂种中的低残留有效碱

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摘要

Chips from E. urophylla x E. grandis hybrid were subjected to kraft cooking using two different approaches: low and high residual effective alkali. The lignin remaining in the pulps were analyzed for hydroxyl and carboxyl functional groups. For both pulping cases, the kappa number varied between 14 and 26. Significant yield gains were observed when kraft cooking was terminated with low residual effective alkali (L-REA) in contrast to those with high residual effective alkali (H-REA) at a given kappa number. The L-REA pulps also tended to contain higher lignin and lower HexA contents than the H-REA pulps at a given kappa number. Cellulolytic enzyme lignin (CEL) was isolated from the studied pulp’s residual lignins, and their hydroxyl functional group distributions were quantified using a method involving ~(31)P NMR. Analysis of residual lignins isolated from L-REA and H-REA cooking indicated that L-REA had high contents of phenolic hydroxyl groups and carboxylic acid groups in relation to the H-REA pulps. This work demonstrates the varied lignin chemistry one can expect when residual effective alkali levels are varied during kraft pulping and how this parameter can influence downstream unit operations and overall process performance.
机译：来自 e的芯片。 Urophylla x e。使用两种不同的方法对Grandis杂交进行牛皮纸烹饪：低残留有效碱。对纸浆中剩余的木质素用于羟基和羧基官能团。对于制浆案例，Kappa数在14和26之间变化。当与具有高残余有效碱（H-REA）的低残留有效碱（L-REA）呈现牛皮纸蒸煮时，观察到显着的产量增益。给予kappa号码。 L-Rea纸浆还倾向于含有较高的木质素和低于给定Kappa号的H-Rea纸浆的木质素和较低的六藻含量。从研究的纸浆的残留木质素中分离出纤维素溶解酶木质素（CEL），并使用涉及〜（31）P NMR的方法定量其羟官能团分布。从L-REA和H-REA烹饪中分离的残留木质素分析表明，L-REA与H-Rea纸浆有关的酚羟基和羧酸基团的高含量。这项工作证明了各种木质素化学，当牛皮纸制浆过程中残留有效碱度水平变化时，这种参数如何影响下游单元操作和整体过程性能。

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