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Chemistry and Industry of Forest Products ›› 2014, Vol. 34 ›› Issue (5): 41-46.doi: 10.3969/j.issn.0253-2417.2014.05.007

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Solubility of Lignin in Ionic Liquid by Assistance of Microwave Energy

LIU Shi-wei, ZHOU Hong-xia, LI Lu, YU Shi-tao, XIE Cong-xia, LIU Fu-sheng   

  1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
  • Received:2013-08-02 Online:2014-10-25 Published:2015-08-18
  • Contact: 于世涛,男,教授,博士生导师,主要从事催化、精细化工及林产化工方面的研究;E-mail:yushitaoqust@126.com E-mail:yushitaoqust@126.com

Abstract: Five phosphite-based ionic liquids were synthesized, characterized, and used to dissolve lignin under oil bath and microwave heating. It was found that ionic liquid 1,3-dimethylimidazolium phosphate [Mmim] DMP had good solubility performance, and the solubility of lignin was 60.0g at 55℃for 30 min. The chemical structure, morphology and crystalline of re-generated lignin from microwave treatment were characterized by FT-IR, SEM, and XRD. The results indicated that the structure of re-generated lignin was unchanged, and the particle had good dispersity and strong diffractive feature. On the other hand, ionic liquid [Mmim] DMP had good reusability. When 100 g[Mmim] DMP was reused for five times, its recovery capacity and lignin solubility were 97.0 g and 57.8g, respectively.

Key words: microwave, ionic liquid, dissolve, lignin

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