蔗渣硫酸盐木质素的分级分离与表征

doi:10.3969/j.issn.0253-2417.2018.05.015

Abstract

Abstract: Kraft lignin(KL) of sugarcane bagasse extracted from bagasse pulping black liquor was successively fractionated into four fractions (e.g. F1, F2, F3 and F4) by various organic solvents (ethyl acetate, ethyl acetate/petroleum ether, and petroleum ether) according to their solubility. Kraft lignin and its three fractions(F1, F2 and F3) were comprehensively characterized by elemental composition analysis, gel permeation chromatography, Fourier transform infrared spectroscopy, and nuclear magnetic resonance including ³¹P, ¹³C, and ¹H-¹³C HSQC NMR, respectively. The results indicated that F1, F2, F3 and F4 were respectively accounting for 59.6%, 28.4%, 10.8% and 1.2% of kraft lignin. Compared with the original kraft lignin, the molecular weight of F1 was higher and the homogeneity was better. The molecular weight and dispersity of lignin fractions F2 to F4 were smaller than those of original kraft lignin. Furthermore, the contents of methoxyl group, hydroxyl group, and inter-unit linkages, as well as the thermal properties of fractions (F1, F2, and F3), were varied with their molecular weights. The proportion of β-O-4' structure decreases with the decrease of molecular weight, and the proportion of β-5' increases with the decrease of molecular weight.

Key words: sugarcane bagasse, kraft lignin, fractionation

CLC Number:

TQ35

JIA Zhuan, WAN Guangcong, LI Mingfu, LUO Bin, WANG Shuangfei, MIN Douyong. Fractionation and Characterization of Sugarcane Bagasse Kraft Lignin[J]. Chemistry and Industry of Forest Products, 2018, 38(5): 107-114.

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Fractionation and Characterization of Sugarcane Bagasse Kraft Lignin

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