SCI和EI收录∣中国化工学会会刊

›› 2017, Vol. 25 ›› Issue (3): 324-329.DOI: 10.1016/j.cjche.2016.06.015

• Energy, Resources and Environmental Technology • 上一篇    下一篇

Characterization of pyrolytic lignins with different activities obtained from bio-oil

Furong Leng, Yurong Wang, Junhao Chen, Shurong Wang, Jinsong Zhou, Zhongyang Luo   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
  • 收稿日期:2016-05-05 修回日期:2016-06-29 出版日期:2017-03-28 发布日期:2017-04-15
  • 通讯作者: Shurong Wang
  • 基金资助:
    Supported by the National Science and Technology Supporting Plan Through Contract (2015BAD15B06), the National Natural Science Foundation of China (51276166), the National Basic Research Program of China (2013CB228101), and Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization (2013A061401005).

Characterization of pyrolytic lignins with different activities obtained from bio-oil

Furong Leng, Yurong Wang, Junhao Chen, Shurong Wang, Jinsong Zhou, Zhongyang Luo   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
  • Received:2016-05-05 Revised:2016-06-29 Online:2017-03-28 Published:2017-04-15
  • Supported by:
    Supported by the National Science and Technology Supporting Plan Through Contract (2015BAD15B06), the National Natural Science Foundation of China (51276166), the National Basic Research Program of China (2013CB228101), and Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization (2013A061401005).

摘要: Pyrolytic lignin, the water-insoluble fraction in bio-oil, often shows a high content and has strong intermolecular interactions with other compounds in bio-oil. In order to obtain pure pyrolytic lignin and facilitate the utilization of aqueous phase obtained fromwater extraction of bio-oil,methanol-water extraction method was employed to further separate the bio-oil water-insoluble phase in this paper. Different technologies, including Fourier transform infrared spectroscopy, gel permeation chromatography, and nuclear magnetic resonance, were adopted to characterize the structures of pyrolytic lignins with different activities obtained through this method. Both the heating value and the polymerization degree of high-molecular-weight pyrolytic lignin were higher than those of low-molecular-weight pyrolytic lignin. The molecularweight distribution of high-molecular-weight pyrolytic ligninwas relatively wider, among which the contents of dimers to pentamers all accounted for 12%-18%, while the low-molecular-weight pyrolytic lignin mainly consisted of trimers (75.38%). The pyrolytic lignins had similar basic structures, both ofwhich contained syringyl and guaiacyl units,whereas the low-molecular-weight pyrolytic lignin had more abundant syringyl units, reactive carbonyl groups and hydroxyl groups. Meanwhile, thermogravimetric study revealed that the final char residue yield of low-molecular-weight pyrolytic lignin was lower than that of high-molecular-weight pyrolytic lignin.

关键词: Bio-oil, Pyrolytic lignin, Separation, Characterization

Abstract: Pyrolytic lignin, the water-insoluble fraction in bio-oil, often shows a high content and has strong intermolecular interactions with other compounds in bio-oil. In order to obtain pure pyrolytic lignin and facilitate the utilization of aqueous phase obtained fromwater extraction of bio-oil,methanol-water extraction method was employed to further separate the bio-oil water-insoluble phase in this paper. Different technologies, including Fourier transform infrared spectroscopy, gel permeation chromatography, and nuclear magnetic resonance, were adopted to characterize the structures of pyrolytic lignins with different activities obtained through this method. Both the heating value and the polymerization degree of high-molecular-weight pyrolytic lignin were higher than those of low-molecular-weight pyrolytic lignin. The molecularweight distribution of high-molecular-weight pyrolytic ligninwas relatively wider, among which the contents of dimers to pentamers all accounted for 12%-18%, while the low-molecular-weight pyrolytic lignin mainly consisted of trimers (75.38%). The pyrolytic lignins had similar basic structures, both ofwhich contained syringyl and guaiacyl units,whereas the low-molecular-weight pyrolytic lignin had more abundant syringyl units, reactive carbonyl groups and hydroxyl groups. Meanwhile, thermogravimetric study revealed that the final char residue yield of low-molecular-weight pyrolytic lignin was lower than that of high-molecular-weight pyrolytic lignin.

Key words: Bio-oil, Pyrolytic lignin, Separation, Characterization