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| Extraction and Characterization of Lignin from Kraft Pulping Black Liquor of Eucalyptus |
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| DOI：10.11980/j.issn.0254-508X.2017.10.004 |
| Key Words:SL CSL extraction FT-IR 1HNMR |
| Fund Project:林业公益性行业科研专项——造纸黑液蒸发与分离特性研究（201504610 2)。 |
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| Abstract:The lignins were extracted from kraft pulping black liquor of Eucalyptus by ethanol sulfuric acid and sulfuric acid respectively. These lignins were analysed and characterized by elemental analysis、 FT-IR、 UV spectrum and 1HNMR.The results showed that the lignin separated by ethanol sulfuric acid （CSL） presented typical characteristics of lignin of hardwood, which included syringyl（S） and guaiacyl（G）units, and the amount of S units was higher than the G units; CSL main linkage bonds were β-O-4、 β-1、 β-5、 β-β, and it contained many more free carbonyl, methoxy and hydroxyl groups and other active groups; CSL composition elements were mainly C,H,O,N, and the contents were 62.55%、 5.57%、 29.54%、 0.15%, respectively,its theoretical molecular formula was C10H10.68O3.54N0.02 . Compared with the lignin extracted directly from the black liquor(SL), CSL had less complex functional groups and molecular． |
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