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Improving the homogeneity of sugarcane bagasse kraft lignin through sequential solvents

机译：通过顺序溶剂改善甘蔗蔗渣硫酸盐木质素的均质性

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The heterogeneous features of lignin, especially the wide distribution of its molecular weight, limit its high value-added application. To improve the homogeneity of lignin, sugarcane bagasse kraft lignin (KL) dissolved in methanol/acetone (7?:?3, v/v) was successively fractionated into four fractions ( i.e. ., F 1, F 2, F 3, and F 4) with various organic solvents of decreasing dissolving capacity ( i.e. ., ethyl acetate, ethyl acetate/petroleum ether 1?:?1 v/v, and petroleum ether). The yields of the four fractions ( F 1, F 2, F 3, and F 4) were 59.6, 28.4, 10.8, and 1.2% that of KL, respectively. Gel permeation chromatography (GPC) analysis indicated the molecular weight of each fraction decreased from F 1 to F 4. All fractions had a lower polydispersity than KL. KL and the fractions were comprehensively characterized by chemical composition analysis, elemental composition analysis (EA), methoxyl group analysis, Fourier transform infrared spectroscopy (FT-IR), nitrobenzene oxidation analysis (NBO), and nuclear magnetic resonance (NMR) including ~(31) P and ~(1) H– ~(13) C HSQC NMR. The results showed that the methoxyl group, hydroxyl group, interunit linkages, and thermal properties of the fractions varied with the molecular weight. The homogeneity of lignin was improved through solvent fractionation.
机译：木质素的异质性，特别是其分子量的广泛分布，限制了其高附加值的应用。为了提高木质素的均质性，将溶于甲醇/丙酮（7？：？3，v / v）的甘蔗渣硫酸盐木质素（KL）依次分馏成四个部分（即F 1，F 2，F 3和F 4），其中各种有机溶剂具有降低的溶解能力（例如，乙酸乙酯，乙酸乙酯/石油醚1？：？1 v / v和石油醚）。四个馏分（F 1，F 2，F 3和F 4）的产率分别为KL的59.6、28.4、10.8和1.2％。凝胶渗透色谱法（GPC）分析表明，每个馏分的分子量从F 1降低到F4。所有馏分的多分散性均低于KL。通过化学成分分析，元素成分分析（EA），甲氧基基团分析，傅里叶变换红外光谱（FT-IR），硝基苯氧化分析（NBO）和核磁共振（NMR）等对KL及其馏分进行了全面表征。 31）P和〜（1）H〜〜（13）C HSQC NMR。结果表明，各部分的甲氧基，羟基，单元间键和热性质随分子量变化。木质素的均质性通过溶剂分馏得到改善。

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