Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Structural Analysis of Open-Column Fractionation of Peracetic Acid-Treated Kraft Lignin

  • PARK, Se-Yeong (Department of Forest Biomaterials Engineering, College of Forest and Environmental Science, Kangwon National University) ;
  • CHOI, June-Ho (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • CHO, Seong-Min (Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University) ;
  • CHOI, Joon Weon (Institute of Green-Bio Science and Technology, Seoul National University) ;
  • CHOI, In-Gyu (Department of Agriculture, Forestry and Bioresources, College of Agriculture and Life Sciences, Seoul National University)
  • Received : 2020.07.05
  • Accepted : 2020.08.10
  • Published : 2020.11.25
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Abstract

This study investigates the selective fractionation of lignin with uniform structures and lower molecular weight. Lignin solubilization was first performed using a solution of acetic acid (AA) and hydrogen peroxide (HP) (4:1, (v/v)) to form peracetic acid (PAA), which is a strong oxidant. After the PAA-induced solubilization that occurred at 80℃, totally soluble lignin was extracted by ethyl acetate (EA) and divided into organic- and water-soluble fractions. The EA fraction was then fractionated by open-column using three solutions (chloroform-ethyl acetate, methanol, and water) sequentially. With an increase in the solvent polarity during the fractionation step, the molecular weight of the lignin-derived compounds in the fraction increased. Remarkably, some lignin fractions did not have aromatic structures. These fractions were identified as carboxylic acid-containing polymers like poly-carboxylates. These results conclude that the selective production of lignin-derived polymers with specific molecular weight and structural characteristics could be possible through open-column fractionation.

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References

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