A practicable process for lignin color reduction: fractionation of lignin using methanol/water as a solvent,Green Chemistry

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A practicable process for lignin color reduction: fractionation of lignin using methanol/water as a solvent
Green Chemistry ( IF 9.3 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1039/c7gc01974b
Hui Zhang _{1,

2,

3,

4} , Youcan Bai _{1,

2,

3,

4} , Boming Yu _{1,

2,

3,

4} , Xinxin Liu _{1,

2,

3,

4} , Fangeng Chen _{1,

2,

3,

4}

Affiliation

In order to expand the application scope of industrial lignin, a nonchemical-reaction color reduction method was carried out. Eucalyptus kraft lignin was fractionated using methanol/water as a solvent and two fractions were obtained. The fraction with lower molecular weight was named L which presents an obvious color advantage compared with the high-molecular fraction named H. The two fractions were characterized by GPC, FTIR, TG-DTG, visible light spectrum, HSQC and ¹³C NMR spectroscopy and relative mechanisms regarding color distinction were proposed. The H fraction contains numerous condensed structures which resulted in high molecular weight and less reactivity. Besides, abundance in conjugated double bonds and quinoid structures determined the darker color of H. The two fractions were sulfonated to prepare lignosulfonate and the product was evaluated as a dye dispersant. The SL fraction shows an obvious advantage regarding color performance compared with the SH fraction and commercial lignosulfonate. Moreover, the SL fraction presents favorable dispersibility and high temperature stability.

中文翻译：

降低木质素颜色的可行方法：使用甲醇/水作为溶剂分馏木质素

为了扩大工业木质素的应用范围，进行了非化学反应减色法。使用甲醇/水作为溶剂对桉树牛皮纸木质素进行分馏，得到两个馏分。分子量较低的馏分命名为L，与分子量较高的馏分H相比，具有明显的颜色优势。这两个馏分的特征在于GPC，FTIR，TG-DTG，可见光谱，HSQC和¹³提出了13 C NMR光谱学和有关色差的相关机理。H馏分包含许多稠合的结构，这导致高分子量和较低的反应性。此外，共轭双键和醌结构的丰度决定了H的颜色较深。将这两个馏分磺化制备木质素磺酸盐，并将其作为染料分散剂进行评估。与SH馏分和市售木质素磺酸盐相比，SL馏分在色彩性能方面显示出明显的优势。此外，SL级分具有良好的分散性和高温稳定性。

更新日期：2017-10-31

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