Membrane and Water Treatment

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Lignin fractionation from waste wood using organosolv treatment combined with membrane filtration

  • Cho, Hyun Uk (Department of Marine Environmental Engineering and Institute of Marine Industry, Gyeongsang National University) ;
  • Lee, Minjeong (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology) ;
  • Shin, Jingyeong (Department of Civil and Environmental Engineering, Hanyang University) ;
  • Kim, Eun-Sik (Department of Environmental System Engineering, Chonnam National University) ;
  • Kim, Young Mo (Department of Civil and Environmental Engineering, Hanyang University)
  • Received : 2019.10.10
  • Accepted : 2019.11.07
  • Published : 2020.01.25
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Abstract

The purpose of this study was to investigate the characteristics of lignin fractionated from waste wood (WW) using a two-step process of ethanol organosolv pretreatment followed by ultrafiltration with membranes of different molecular weight cut-offs (1, 5 and 20 kDa). The different permeates obtained were characterized by fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA) and gel permeation chromatography (GPC). The analysis by FT-IR and NMR of these lignins showed that the lignin core was successfully separated from WW. TGA curves confirmed that the thermal properties of lignin fractionated by ultrafiltration were almost identical to each other. The results from GPC confirmed that fractionating of lignin was achieved by ultrafiltration. For the membrane fractionation process, values of molecular weight decreased as the cut-offs used to obtain the fractions became smaller. As a result, fractionating lignin by a two-step process allowed separating different fractions of lignin of different molecular weights yielded high purity without interference from existing pollutants in WW. The two-step process offers the possibility of using fractionated WW as an untapped source of lignin.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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