Citation: OUYANG Xin-ping, HUANG Xiang-zhen, QIU Xue-qing. Liquefaction of wheat straw alkali lignin under microwave irradiation[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(10): 1212-1217. shu

Liquefaction of wheat straw alkali lignin under microwave irradiation

1.
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Corresponding author: QIU Xue-qing,
Received Date: 5 June 2014
Available Online: 4 July 2014
Fund Project: 国家重点基础研究发展规划(973计划, 2012CB215302)。 (973计划, 2012CB215302)

The effects of liquefying agent, catalyst, reaction temperature and time on the yield of bio-oil in microwave assisted liquefaction of wheat straw alkali lignin were investigated. And the liquefaction products were characterized by FT-IR, GC-MS and ¹H-NMR. It is found that microwave irradiation greatly shortens liquefaction time with methanol as liquefying agent and ferric sulfate as catalyst, where the yield of bio-oil is up to 55.22% at the relatively low liquefaction temperature of 160 ℃ for 5 min. The structure of residual lignin after liquefaction exhibits very limited variation, indicating that the degraded lignin fragments have lower probability of recondensation, and residual lignin can be reused to improve the utilization rate of lignin. The identified liquefaction products are mainly monophenolic compounds, in which S, G and H type compounds account for 57.72%, 25.28% and 8.98%, respectively. The existence of the signals for β-O-4 and C-C bonds in the ¹H-NMR spectra suggests that the bio-oils include a small amount of dimers and oligomers except for monophenolic compounds.
- wheat straw alkali lignin,
- microwave irradiation,
- liquefaction,
- liquefying agent,
- bio-oil
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