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

doi:10.1016/j.cjche.2016.06.015

Abstract

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

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

Furong Leng, Yurong Wang, Junhao Chen, Shurong Wang, Jinsong Zhou, Zhongyang Luo. Characterization of pyrolytic lignins with different activities obtained from bio-oil[J]. , 2017, 25(3): 324-329.

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