Welcome to Chemistry and Industry of Forest Products,

Chemistry and Industry of Forest Products ›› 2016, Vol. 36 ›› Issue (4): 1-6.doi: 10.3969/j.issn.0253-2417.2016.04.001

    Next Articles

Application of Ionic Liquid [Hmim] [CF3SO3] in Biodegradation of Lignin & Lignin Model Compounds

CUI Jing-jing1, LI Yun-hua2, CHEN Bing-hui1,2   

  1. 1. School of Energy, Xiamen University, Xiamen 361005, China;
    2. School of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
  • Received:2015-04-17 Online:2016-08-25 Published:2016-09-01

Abstract: The ternary liquid-liquid equilibrium system composed of ionic liquid [Hmim] [CF3SO3] which dissolved lignin with enzyme solution and the organic acid was investigated in present study. The enzymatic reactions in the system were also studied. The transformation from water-ionic two phase system to homogeneous system should be attributed to the function of carboxylic acid groups in small molecule organic acids. [Hmim] [CF3SO3] with dissolved lignin could also compose the ternary system with water and organic acid. In the degradation reaction, formic acid played two roles in balancing the hydrophobic phase ([Hmim] [CF3SO3] with dissolved lignin), and aqueous phase (enzyme solution), and acting as radical stabilizer for lignin degrading enzymatic reaction. The degradation rates of alkali lignin and dehydrogenation polymers of lignin (DHPs) were 56.5% and 66.5%, and the content of methoxyl group decreased by 46.7% and 45.3%, respectively. The generated phenolic compounds were 204.7 and 207.0 mg/L, and the formic acid consumption were 0.57 and 0.76 g, respectively. In the DHPs degradation process, the ternary equilibrium was disintegrated due to the excessive consumption of formic acid.

Key words: ternary liquid-liquid system, ionic liquid, lignin degradation, phenols

CLC Number: