麦草碱木质素的微波辅助液化降解

欧阳新平; 黄相振; 邱学青

麦草碱木质素的微波辅助液化降解

华南理工大学化学与化工学院, 广东广州 510640

基金项目: 国家重点基础研究发展规划(973计划, 2012CB215302)。

详细信息

通讯作者:
邱学青,Tel:020-87114968,E-mail:xueqingqiu66@163.com。

中图分类号: TK6
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- 被引次数: 0
出版历程
- 收稿日期: 2014-06-05
- 修回日期: 2014-07-04
- 刊出日期: 2014-10-30

Liquefaction of wheat straw alkali lignin under microwave irradiation

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

摘要

摘要: 研究了微波辅助条件下液化剂、催化剂、反应温度和反应时间对麦草碱木质素进行液化降解制备生物油收率的影响,并利用红外光谱(FT-IR)、气相色谱质谱联用仪(GC-MS)和核磁共振氢谱(¹H-NMR)对产物进行表征。结果表明,微波辅助下以甲醇为液化剂,硫酸铁为催化剂液化降解碱木质素可以显著缩短液化反应时间,在160 ℃相对较低液化温度下反应5 min,生物油的收率达到55.22%。液化降解后的木质素残渣结构变化少,表明木质素降解产物的重新聚合的几率低,碱木质素反应原料可以回收再利用以提高原料利用率。生物油主要为单酚类物质,其中,S型、G型和H型单体的含量分别为57.72%、25.28%和8.98%。核磁共振氢谱中β-O-4键和C-C键质子峰的存在说明生物油中含有部分的二聚体和低聚体酚类化合物。
- 麦草碱木质素 /
- 微波辅助 /
- 液化 /
- 液化剂 /
- 生物油
Abstract: 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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参考文献(19)

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