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Official Journal of the Japan Wood Research Society

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Reaction behavior of wood in an ionic liquid, 1-ethyl-3-methylimidazolium chloride


Reaction of Japanese beech (Fagus crenata) in an ionic liquid, 1-ethyl-3-methylimidazolium chloride ([C2mim][Cl]), which can dissolve cellulose, was investigated. Although both lignin and polysaccharides such as cellulose and hemicelluloses can be liquefied at a treatment temperature of around 100°C, the liquefaction of polysaccharides mainly occurs at the beginning of the treatment with [C2mim][Cl]. Cellulose crystallinity in the wood was gradually broken down as the treatment continued. The solubilized polymers were depolymerized to low molecular weight compounds. The results indicate that [C2mim][Cl] is an effective solvent and reagent for the liquefaction of wood components and subsequent depolymerization of them.


  1. 1.

    Goldstein IS (1980) The hydrolysis of wood. TAPPI 63:141–143

    CAS  Google Scholar 

  2. 2.

    Chang VS, Holtzapple MT (2000) Fundamental factors affecting biomass enzymatic reactivity. Appl Biochem Eng Biotechnol 38:53–87

    Google Scholar 

  3. 3.

    Mok WS, Antal MJ Jr (1992) Uncatalyzed solvolysis of whole biomass hemicelluloses by hot compressed liquid water. Ind Eng Chem Res 31:1157–1161

    CAS  Article  Google Scholar 

  4. 4.

    Saka S, Konishi R (2001) Chemical conversion of biomass resources to useful chemicals and fuels by supercritical water treatment. In: Bridgewater AV (ed) Progress in thermochemical biomass conversion. Blackwell, Oxford, pp 1338–1348

    Google Scholar 

  5. 5.

    Yamazaki J, Minami E, Saka S (2006) Liquefaction of beech wood in various supercritical alcohols. J Wood Sci 52:527–532

    CAS  Article  Google Scholar 

  6. 6.

    Kwon GJ, Kuga S, Hori K, Yatagai M, Ando K, Hattori N (2006) Saccharification of cellulose by dry pyrolysis. J Wood Sci 52:461–465

    CAS  Article  Google Scholar 

  7. 7.

    Hosoya T, Kawamoto H, Saka S (2007) Influence of inorganic matter on wood pyrolysis at gasification temperature. J Wood Sci 53:351–357

    CAS  Article  Google Scholar 

  8. 8.

    Sheldon R (2001) Catalytic reaction in ionic liquids. Chem Commun 2399–2407

  9. 9.

    Zulfiqar F, Kitazume T (2000) One-pot aza-Diels-Alder reaction in ionic liquids. Green Chem 2:137–139

    CAS  Article  Google Scholar 

  10. 10.

    Swatloski RP, Spear SK, Hobrey JD, Rogers RD (2002) Dissolution of cellulose with ionic liquids. J Am Chem Soc 124:4947–4975

    Article  Google Scholar 

  11. 11.

    Turner MB, Spear SK, Hobrey JD, Rogers RD (2004) Production of bioactive cellulose films reconstituted from ionic liquids. Biomacromolecules 5:1379–1384

    CAS  Article  PubMed  Google Scholar 

  12. 12.

    Heinze T, Schwikal K, Barthel S (2005) Ionic liquids as reaction medium in cellulose functionalization. Macromol Biosci 5:520–525

    CAS  Article  PubMed  Google Scholar 

  13. 13.

    Wu J, Zhang J, He J, Ren Q, Guo M (2004) Homogeneous acetylation of cellulose in a new ionic liquid. Biomacromolecules 5:266–268

    CAS  Article  PubMed  Google Scholar 

  14. 14.

    Cao Y, Wu J, Meng T, Zhang J, He J, Li H, Zhang Y (2007) Acetone-soluble cellulose acetates prepared by one-step homogeneous acetylation of cornhusk cellulose in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl). Carbohydr Polym 69:665–672

    CAS  Article  Google Scholar 

  15. 15.

    Schlufter K, Schmauder H-P, Dorn S, Heinze T (2006) Efficient homogeneous chemical modification of bacterial cellulose in the ionic liquid 1-n-butylimidazolium chloride. Macromol Rapid Commun 27:1670–1676

    CAS  Article  Google Scholar 

  16. 16.

    Barthel S, Heinze T (2006) Acylation and carbanilation of cellulose in ionic liquids. Green Chem 8:301–306

    CAS  Article  Google Scholar 

  17. 17.

    Liu CF, Sun RC, Zhang AP, Ren JL, Wang XA, Qin MH, Chao ZN, Luo W (2007) Homogeneous modification of sugarcane bagasse cellulose with succinic anhydride using an ionic liquid as reaction medium. Carbohydr Res 342:919–926

    CAS  Article  PubMed  Google Scholar 

  18. 18.

    Liu CF, Sun RC, Zhang AP, Qin MH, Ren JL, Wang XA (2007) Preparation and characterization of phthalated cellulose derivatives in room-temperature ionic liquid without catalysts. J Agr Food Chem 55:2399–2406

    CAS  Article  Google Scholar 

  19. 19.

    Xie H, Shi T (2006) Wood liquefaction by ionic liquid. Holzforschung 60:509–512

    Google Scholar 

  20. 20.

    Kilpeläinen I, Xie H, King A, Granstrom M, Heikkinen S, Argyropoulos DS (2007) Dissolution of wood in ionic liquids. J Agr Food Chem 55:9142–9148

    Article  Google Scholar 

  21. 21.

    Pu Y, Jiang N, Ragauskas AJ (2007) Ionic liquid as a green solvent for lignin. J Wood Chem Technol 27:23–33

    CAS  Article  Google Scholar 

  22. 22.

    Dence CW (1992) The determination of lignin. In: Lin SY, Dence CW (eds) Methods in lignin chemistry. Springer, Berlin Heidelberg New York, pp 33–39

    Google Scholar 

  23. 23.

    Kubo S, Hashida K, Hosoya S, Yamada T, Magara K, Kishino M, Ohno H (2007) Solubility of wood and stability of lignin model compounds in ionic liquid (in Japanese). Proceedings of 52nd Lignin Symposium, Utsunomiya, pp 134–137

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Correspondence to Hisashi Miyafuji.

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Miyafuji, H., Miyata, K., Saka, S. et al. Reaction behavior of wood in an ionic liquid, 1-ethyl-3-methylimidazolium chloride. J Wood Sci 55, 215–219 (2009).

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Key words

  • Wood
  • Ionic liquid
  • 1-Ethyl-3-methylimidazolium chloride
  • Reaction behavior
  • Depolymerization