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科技导报  2015 

沙柳在混合供氢溶剂中的液化工艺及产物特性

DOI: 10.3981/j.issn.1000-7857.2015.09.003, PP. 25-30

Keywords: 沙柳,苯酚和四氢萘混合供氢溶剂,液化产物,固体残渣

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Abstract:

采用单因素和正交实验,考察了沙生灌木沙柳在苯酚和四氢萘混合供氢溶剂中液化的反应时间、反应温度、催化剂用量、苯酚用量和四氢萘用量等工艺参数对液化产物残渣率的影响,得到沙柳在混合溶剂中的最优化工艺是反应温度120℃,反应时间2h,催化剂(98%的浓硫酸)1mL,苯酚15g,四氢萘5mL,此条件下的液化率可达97.51%。各因素影响次序为反应温度>反应时间>催化剂用量>四氢萘用量>苯酚用量。不同反应时间下的沙柳液化液体产物红外谱图表明,在反应时间30min前产生新峰,在30min后谱图特征相同;固体残渣红外谱图表明,沙柳组分中的木质素和半纤维素首先发生了降解,木质素结构单元中的酚醚键断裂先于木质素芳香核之间的碳碳键的断裂,且液化反应的最终固体残渣中含有吡喃糖环和缔合羟基;液化固体残渣热重分析表明,产物中的有机质随液化的进行逐步减少,且热分解反应分为2个阶段,表现出明显的阶段性。

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