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http://dx.doi.org/10.5658/WOOD.2020.48.6.769

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)
Publication Information
Journal of the Korean Wood Science and Technology / v.48, no.6, 2020 , pp. 769-779 More about this Journal
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.
Keywords
lignin solubilization; peracetic acid treatment; column fractionation; lignin application;
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