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| Fractionation and Characterization of Lignin from Soybean Stalk and Bamboo Pulping Black Liquor |
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| DOI：10.11981/j.issn.1000-6842.2016.01.37 |
| Key Words:alkali lignin； fractionation； molecular weight； particle size |
| Fund Project:2014年大学生实践创新计划项目(省级一般项目)；南京林业大学高层次人才引进科研启动基金(163105017)及青年拔尖人才基金(163105071)；2014江苏省高校“青蓝工程优秀青年骨干教师”项目。 |
| Author Name | Affiliation | | 刘 波 | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 陈 飞 | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 裔 力 | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 任 浩* | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 |
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| Abstract: |
| In this thesis, acid precipitation method was used to separate alkali lignin from soybean stalk and bamboo kraft pulping stalk liquor. The molecular weights of alkali lignin separated under different pH values were compared. The dissolving characters of lignin under acidic condition were studied. Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatography (GPC) and dynamic light scattering (DLS) were used to analysis structure and molecular weight of alkali lignin samples. It was found that after being fractionated, the molecular weight distribution of alkali lignin became narrower. The molecular weight and particle size of alkali lignin which was precipitated decreased continuously with decreasing of pH value. It indicated that acid precipitation process was an effective method for fractionation of alkali lignin with different molecular weights. |
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