Structural features of lignin macromolecules extracted with ionic liquid from poplar wood

Jae Young Kim, Eun Jin Shin, In Yong Eom, Keehoon Won, Yong Hwan Kim, Donha Choi, In Gyu Choi, Joon Weon Choi

Research output: Contribution to journalArticlepeer-review

150 Scopus citations

Abstract

1-Ethyl-3-methylimidazolium acetate ([Emim][CH 3COO]) was used for the extraction of lignin from poplar wood (Populus albaglandulosa), which was called to ionic liquid lignin (ILL) and structural features of ILL were compared with the corresponding milled wood lignin (MWL). Yields of ILL and MWL were 5.8±0.3% and 4.4±0.4%, respectively. The maximum decomposition rate (V M) and temperature (T M) corresponding to V M were 0.25%/°C and 308.2°C for ILL and 0.30%/°C and 381.3°C for MWL. The amounts of functional groups (OMe and phenolic OH) appeared to be similar for both lignins; approximately 15.5% and 6.7% for ILL and 14.4% and 6.3% for MWL. However, the weight average molecular weight (M w) of ILL (6347Da) was determined to be 2/3-fold of that of MWL (10,002Da) and polydispersity index (PDI: M w/M n) suggested that the lignin fragments were more uniform in the ILL (PDI 1.62) than in the MWL (PDI 2.64).

Original languageEnglish
Pages (from-to)9020-9025
Number of pages6
JournalBioresource Technology
Volume102
Issue number19
DOIs
StatePublished - Oct 2011

Keywords

  • β-O-4 linkage
  • 1-Ethyl-3-methylimidazolium acetate
  • Ionic liquid lignin
  • Milled wood lignin
  • Thermogravimetric analysis

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