The Analyses of Lignin Structure and Molecular Distribution of pH6 from Dissolved Kraft Lignin

Chun Jing Zhang; Yu Liu; Li Bin Dong

doi:10.4028/www.scientific.net/AMR.550-553.3311

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 550-553The Analyses of Lignin Structure and Molecular...

The Analyses of Lignin Structure and Molecular Distribution of pH6 from Dissolved Kraft Lignin

Abstract:

The Chinese poplar was used as the raw material in this study. Conversational Kraft cooking was carried out. The acid-precipitating method was used to separate the dissolved lignin from the black liquor. The FT-IR spectra was quantitatively analyzed and compared in order to discover the change of lignin structures. The lignin 31P—NMR spectra of pH6 lignin samples was obtained and the functional groups of the lignin was quantitatively analyzed and compared in order to discover the change of lignin structures during Kraft cooking. Syrinl-OH was 50~60 percent, Guaiacyl-OH was 40~50 percent. The pH6 lignin samples of 31P-NMR spectra aliphatic OH was 2.75 m mol/g, COOH was 1.75 m mol/g, total phenolic OH 5.66 m mol/g. The molecular weight distribution curves of lignin samples obtained from gel permeation chromatography analysis system was shown that Mw was 1375g/mol, Mn was 2426 g/mol and polydispersity was 4424 g/mol.

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Periodical:

Advanced Materials Research (Volumes 550-553)

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3311-3315

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.550-553.3311

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Online since:

July 2012

Authors:

Chun Jing Zhang, Yu Liu, Li Bin Dong

Keywords:

Acid-Precipitating, Dissolved Lignin, pH6

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