Thermochemical properties of lignin extracted from willow by deep eutectic solvents (DES)
Thermochemical properties of lignin extracted from willow by deep eutectic solvents (DES)
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低共熔溶剂（DES）从柳树中提取木质素的热化学性质
DOI：
10.1007/s10570-019-02489-8
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发表时间：
2019-10
期刊：
影响因子：
5.7
通讯作者：
Yang Guihua
中科院分区：
文献类型：
--
作者：
Lyu Gaojin;Wu Qin;Li Tengfei;Jiang Weikun;Ji Xingxiang;Yang Guihua
在本研究中，采用热重分析仪、原位漫反射红外热解（in situ-FTIR）和热解-气相色谱/质谱联用技术研究了经过不同时间的低共熔溶剂（DES）处理从柳树（Salix matsudanacv. Zhuliu）中提取的木质素（DES-木质素）的热化学行为。结果表明，DES-木质素的热降解主要发生在185~470℃，并在265℃和380℃分别出现两个最大失重峰，在800℃终止时固体残留率为40%。原位 FTIR 检测到的芳香族化合物簇比小分子气体更早且更强，表明木质素分子间键的断裂主导了初始热解过程。 DES-木质素对热解产生芳烃很敏感。 DES-木质素热解的总酚收率在450℃时达到最大值95.1%，其中苯酚和愈创木酚所占比例最大，分别为20.8%和24.2%。此外，产品分布受到热解温度和用于木质素分离的 DES 处理时间的显着影响。
In the present examination, the thermochemical behavior of the lignin extracted from willow (Salix matsudanacv. Zhuliu) by deep eutectic solvents (DES) treatment (DES-lignin) with varied times were investigated with the techniques of thermogravimetric analyzer, in situ diffuse reflectance infrared pyrolysis (in situ-FTIR), and pyrolysis–gas chromatography/mass spectrometry. The results showed that thermal degradation of DES-lignin mainly occurred at 185–470 °C with two maximum weight loss peaks at 265 °C and 380 °C respectively, and the solid residue was 40% when terminated at 800 °C. The identified cluster of aromatics from in situ-FTIR was detected earlier and stronger than those of small molecular gases, suggesting cleavage of lignin intermolecular linkages dominated the initial pyrolysis process. The DES-lignin was sensitive to pyrolysis to produce aromatics. The total phenols yield from DES-lignin pyrolysis reached a maxima of 95.1% at 450 °C, among which phenol and guaiacol accounted for the largest proportion, i.e. 20.8% and 24.2% respectively. In addition, product distribution was remarkably affected by pyrolysis temperature and the DES treatment time used for lignin isolation.
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通讯作者：
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