Supercritical Water-induced Lignin Decomposition Reactions: A Structural and Quantitative Study

Supercritical Water-induced Lignin Decomposition Reactions: A Structural and Quantitative Study
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超临界水诱导的木质素分解反应:结构和定量研究

DOI:
10.15376/biores.11.3.5660-5675
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发表时间:
2016-05
期刊:
影响因子:
1.5
通讯作者:
Yu Liu
Yu Liu
中科院分区:
材料科学4区
文献类型:
--
作者:
Weikun Jiang;Gaojin Lyu;Shubin Wu;Lucian A. Lucia;Guihua Yang;Yu Liu

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利用超临界水分解木质素,并评价其对木质素分解和转化为各种产物的影响是当前研究的重点。白杨碱木质素(AL)、玉米芯-木糖醇残渣木质素(XRL)和玉米杆-乙醇残渣木质素(ERL)是所研究的木质素种类,因为它们构成了生物质精炼工业中可用的主要残余木质素。采用元素分析、傅里叶变换红外光谱(FT-IR)、磷核磁共振(31 P-NMR)、X射线衍射(XRD)等方法对木质素进行了表征,并采用气相色谱-质谱(GC-MS)联用仪对木质素的水热解聚产物进行了分析。结果表明,木质素是一种潜在的有价值的芳烃来源。总酚得率最高的是XRL,为140 mg/g,最低的是AL,为90 mg/g。苯酚的最大产率(28.94 mg/g)和4-乙基苯酚在375 °C下XRL解聚30 min,得到愈创木酚的最佳产率为36.21 mg/g,(14.34 mg/g)和2,6-二甲氧基苯酚(15.67 mg/g)。这里的信息提供了一些见解,对发展选择性生物炼制方法,木质素到-有机产品转化过程。
The use of supercritical water for the decomposition of lignin and evaluation of its influence on lignin decomposition and conversion to various products was the thrust of the current study. Poplar alkali lignin (AL), corncob-to-xylitol residue lignin (XRL), and cornstalk-to-ethanol residue lignin (ERL) were the lignin species studied because they constitute the main residual lignins available in the biomass refinery industry. The lignins were characterized by elementary analysis, Fourier transform infrared spectrometry (FT-IR), phosphorus nuclear magnetic resonance (31P-NMR), and X-ray diffraction (XRD), and their hydrothermal depolymerization products were analyzed by gas chromatography-mass spectrometer (GC–MS). The results showed that the residual lignin is a potential source for valuable aromatics. The XRL had the best total phenolics yield, 140 mg/g, while AL had the lowest, 90 mg/g. The maximum yields of phenol (28.94 mg/g) and 4-ethylphenol (36.21 mg/g) were obtained from XRL depolymerization at 375 °C for 30 min, and the optimal yields of guaiacol (14.34 mg/g) and 2,6-dimethoxyphenol (15.67 mg/g) were achieved by AL at 375 °C for 30 min. The information here provides some insights toward developing selective biorefinery methods for lignin-to-organic products conversion processes.
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