Structural characterization of birch lignin isolated from a pressurized hot water extraction and mild alkali pulped biorefinery process

L. Lagerquist, A. Pranovich, A. Smeds, S. von Schoultz, L. Vähäsalo, J. Rahkila, I. Kilpeläinen, T. Tamminen, S. Willför, P. Eklund

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11 Citations (Scopus)

Abstract

In this work we have characterized a mild soda pulped birch (betula pendula) lignin after a novel pressurized hot water extraction pilot process. In the process hemicelluloses are first isolated from woods chips with hot water at oxygen-starved conditions, followed by mild alkali pulping at oxygen-starved conditions to remove lignin from the cellulose. Lignin was precipitated, washed and fractionated from the black liquor and characterized by quantitative 13C NMR, 13C DEPT experiments, 31P NMR, 2D HSQC, FTIR, size exclusion chromatography (SEC), elemental analysis, pyrolysis-gas chromatography-mass spectrometry (py-GC–MS), methoxyl group quantification and residual carbohydrate analysis after methanolysis. The structure was compared to a MWL of birch obtained from the same wood chips and the differences were an increase in phenolic hydroxyl groups, carboxylic groups, polydispersity index, and reduction of aliphatic hydroxyl groups. The process resulted in β-O-4 cleavage and condensation of the structure. This lignin is therefore suitable to be used in its polymeric form, rather than for degradation of the structure to small building blocks.

Original languageEnglish
Pages (from-to)306-316
Number of pages11
JournalIndustrial Crops and Products
Volume111
Early online date2018
DOIs
Publication statusPublished - 1 Jan 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Aryl glycerol
  • Birch lignin
  • Condensed structures
  • Lignin characterization
  • Milled wood lignin
  • Pressurized hot water extraction

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    Lagerquist, L., Pranovich, A., Smeds, A., von Schoultz, S., Vähäsalo, L., Rahkila, J., Kilpeläinen, I., Tamminen, T., Willför, S., & Eklund, P. (2018). Structural characterization of birch lignin isolated from a pressurized hot water extraction and mild alkali pulped biorefinery process. Industrial Crops and Products, 111, 306-316. https://doi.org/10.1016/j.indcrop.2017.10.040