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Chemistry and Industry of Forest Products ›› 2016, Vol. 36 ›› Issue (5): 45-52.doi: 10.3969/j.issn.0253-2417.2016.05.007

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Dissolution Performance of Lignin in Triazole-bazed Ionic Liquids

WANG Ya-nan, LIU Shi-wei, LI Lu, YU Shi-tao   

  1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
  • Received:2015-11-30 Online:2016-10-25 Published:2016-11-05

Abstract: Three triazolyl ionic liquids, i.e., 1-butyl-3-methylimidazolium triazole([Bmim] tr), N-methyl-N-n-butylmorpholinium triazole([Bmmo] tr), N-n-butylpyridinium triazole([Bpy] tr), were synthesized. It was found that ionic liquid[Bmim] tr had good solubility performance for lignin dissolution,and the solubility was 58.61 g at 55℃ under microwave heating. The chemical structure, molecular weight, crystalline and morphology of regenerated lignin from microwave treatment were characterized by HSQC, FT-IR, GPC, XRD and SEM. The results indicated that microwave heating trends to cleavage hydrogen bonds and β-O-4' linkages, which accelerated the dissolution of lignin. And the basic structural unit of lignin was not destroyed in the dissolution process. The analysis showed that the dissolution mechanism of lignin in ionic liquid was the hydrogen bond damage and fracture of β-O-4' connection structure.

Key words: triazole, ionic liquids, lignin, dissolution

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