SOLVENT EFFECTS ON ORGANOSOLV LIGNIN FROM PINUS-CARIBAEA-HONDURENSIS
SOLVENT EFFECTS ON ORGANOSOLV LIGNIN FROM PINUS-CARIBAEA-HONDURENSIS
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DOI：
10.1515/hfsg.1992.46.4.343
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发表时间：
1992-01-01
期刊：
影响因子：
2.4
通讯作者：
DEGROOTE, RAMC
中科院分区：
文献类型：
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作者：
BALOGH, DT;CURVELO, AAS;DEGROOTE, RAMC
用9种不同的有机溶剂(9：1的混合溶剂和2.0N的盐酸水溶液)在不锈钢反应器中于125℃下制浆6h，从红松木屑中提取木质素(苯/甲醇1：1预提取)。用化学分析(元素分析、甲氧基和酚羟基)和红外光谱对所得木素进行了表征。此外，用气相渗透法和高效尺寸排阻色谱测定了平均分子质量(MnBAR、MwBAR和MWD)，并根据所用溶剂的不同呈现出三种不同的模式。木质素的产率取决于溶剂的可及性和亲核性以及木质素的溶解度，并与混合溶剂的希尔德布兰德溶解度参数(德尔塔)有关。木质素产率与三角洲的关系曲线呈“钟形”特征，最大值为23MPa1/2，对应于木质素的溶解度参数。
Lignin from Pinus caribaea hondurensis sawdust (pre-extracted with benzene/methanol 1:1) was obtained by pulping using nine different organic solvents (in 9:1 mixtures with 2.0 N HCI aqueous solutions) in a stainless steel reactor at 125-degrees-C for six hours. The obtained lignins were characterized by chemical analysis (elemental analysis, methoxyl and phenolic hydroxyl groups) and by infrared spectroscopy. Moreover, the average molecular weights (MnBAR, MwBAR and MWD) were determined by vapor phase osmometry and high performance-size exclusion chromatography and shown three different patterns according to the solvent mixtures employed. The yields of lignin depend on the accessibility and nucleophilicity of the solvents as well as on the lignin solubility, and are related to the Hildebrand's solubility parameters (delta) of the solvent mixtures. The plot of lignin yields against delta show a characteristic "Bell shape" curve with maximum at 23 MPa1/2 corresponding to the lignin solubility parameter.