College of Energy, Xiamen University, Xiamen 361102, PR China; Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass, Xiamen Key Laboratory of Clean and High-valued Applications of Biomass, Xiamen University, Xiamen 361102, PR China.
College of Energy, Xiamen University, Xiamen 361102, PR China; Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass, Xiamen Key Laboratory of Clean and High-valued Applications of Biomass, Xiamen University, Xiamen 361102, PR China.
Int J Biol Macromol. 2022 Nov 30;221:986-993. doi: 10.1016/j.ijbiomac.2022.09.002. Epub 2022 Sep 6.
Maleic acid (MA) is an effective solvent for lignin extraction from raw biomass under mild conditions through acidolysis and hydrophobic interaction. To improve the valorization of lignin, the lignin extracted with MA was subjected to successive organic solvent fractionation to make the narrow M and M distribution and the homogeneity structure of lignin fragments. After successive organic solvent fractionation, the dispersity index (Đ) of lignin reduced from 2.86 to 1.25, and the purity and homogeneity were greatly improved. The phenolic hydroxyl content of lignin extracted by ethyl acetate was the highest (2.45 mmol/g), and the aliphatic-OH concentration was the lowest (0.65 mmol/g). While the βO4 bonds were partially cleaved, more hydrophobic substrates with CC linkages were recovered by ethyl acetate. Lignin fragments with a variety of main structures and functional groups were obtained effectively with successive fractionation. This method supplied broad prospects for the preparation of lignin and its applications in epoxy resin, rubber, thermoplastic additives and polymer raw materials.
顺丁烯二酸（MA）是一种有效的溶剂，可通过酸解和疏水性相互作用，在温和条件下从原料生物量中提取木质素。为了提高木质素的附加值，用 MA 提取的木质素进行了连续有机溶剂分级，以获得窄的 M 和 M 分布以及木质素片段的均相结构。经过连续有机溶剂分级，木质素的分散指数（Đ）从 2.86 降低到 1.25，纯度和均一性得到了极大的提高。乙酸乙酯提取的木质素的酚羟基含量最高（2.45 mmol/g），脂肪醇-OH 浓度最低（0.65 mmol/g）。虽然βO4 键部分断裂，但通过乙酸乙酯回收了更多具有 CC 键的疏水性底物。通过连续分级，有效地获得了具有多种主要结构和官能团的木质素片段。该方法为木质素的制备及其在环氧树脂、橡胶、热塑性添加剂和聚合物原料中的应用提供了广阔的前景。
