Preparation and Characterization of a Water‐Soluble Kraft Lignin,Advanced Sustainable Systems

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Preparation and Characterization of a Water‐Soluble Kraft Lignin
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2020-05-14 , DOI: 10.1002/adsu.202000052
Silvia Maitz ₁ , Werner Schlemmer ₂ , Mathias Andreas Hobisch ₂ , Josefine Hobisch ₃ , Marlene Kienberger ₁

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Kraft lignin can be extracted from black liquor generated during wood digestion. At present, water soluble kraft lignin is prepared chemically. Here, a method for the preparation of a purified form of CO₂‐precipitated softwood kraft lignin, which forms a stable aqueous solution at a pH value of 8.9 is described. The lignin samples are characterized by thermogravimetric analysis, IR spectroscopy, nuclear magnetic resonance spectroscopy, and gel permeation chromatography. The comparison of water‐washed lignin with reference samples of unwashed‐ and acid‐washed lignin shows that the water‐washed lignin has a higher molecular weight compared to the reference samples, while the content of hydroxyl and methoxyl groups is similar. Solubility studies show that drying of washed lignin has a significant effect on its dissolution in water. Charge titration and dynamic light scattering experiments show that water‐washed lignin forms a stable colloid in aqueous solution.

中文翻译：

水溶性牛皮纸木质素的制备与表征

可以从木材消化过程中产生的黑液中提取硫酸盐木质素。目前，水溶性牛皮纸木质素是化学制备的。在这里，一种制备纯化形式的CO _2的方法描述了沉淀的针叶木硫酸盐木质素，它在pH值为8.9时形成稳定的水溶液。木质素样品通过热重分析，红外光谱，核磁共振光谱和凝胶渗透色谱进行表征。将水洗木质素与未洗涤和酸洗木质素的参考样品进行比较表明，水洗木质素具有比参考样品更高的分子量，而羟基和甲氧基的含量相似。溶解度研究表明，洗涤过的木质素的干燥对其在水中的溶解有显着影响。电荷滴定和动态光散射实验表明，水洗木质素在水溶液中形成稳定的胶体。

更新日期：2020-05-14

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