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首页> 外文期刊>Journal of Wood Chemistry and Technology >CHARACTERIZATION OF LIGNIN DISSOLVED DURING ALKALINE PRETREATMENT OF SOFTWOOD AND HARDWOOD
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CHARACTERIZATION OF LIGNIN DISSOLVED DURING ALKALINE PRETREATMENT OF SOFTWOOD AND HARDWOOD

机译：碱预处理软木和硬木过程中溶解的木质素的表征

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摘要

Various alkaline pretreatments were applied to Scots pine (Pinus sylvestris) and silver/white birch (Betula pendula/pubescens) wood chips and the characterization of sulfur-free lignin dissolved was performed. The behavior of lignin during these pretreatments (alkali charge 1-8% NaOH, time 30-120 minutes, and temperature 130-150 degrees C) was studied mainly in terms of lignin removal efficiency and molar mass distribution of dissolved lignin. The amount of lignin in pretreatment liquors increased along with an increase in the alkali charge of 0.8-4.4% and 0.6-3.4% of o.d. pine and birch wood, respectively. The most significant parameter affecting the molar mass of the dissolved lignin was shown to be the alkali charge, since an increase in this parameter clearly increased the (M) over bar (w)-values of dissolved lignin, varying from 2,260 g/mol to 7,050 g/mol and from 2,200 g/mol to 5,550 g/mol for pine and birch lignin, respectively.
机译：对苏格兰松树（Pinus sylvestris）和白桦木（Betula pendula / pubescens）的木片进行了各种碱性预处理，并对溶解的无硫木质素进行了表征。主要在木质素去除效率和溶解的木质素的摩尔质量分布方面研究了木质素在这些预处理过程中的行为（碱加料为8％的NaOH，时间为30-120分钟，温度为130-150摄氏度）。预处理液中木质素的含量增加，碱度增加o.d的0.8-4.4％和0.6-3.4％。松木和桦木。影响溶解的木质素摩尔质量的最重要参数显示为碱电荷，因为此参数的增加明显增加了溶解的木质素的（M）超过bar（w）值，范围从2,260 g / mol至松木和桦木木质素分别为7,050 g / mol和2,200 g / mol至5,550 g / mol。

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