OALib Journal期刊
木质素超临界溶剂降解反应及其在酚醛树脂合成中的应用
DOI: 10.3724/SP.J.1105.2011.11001
Keywords: 木质素 ,降解 ,还原 ,酚类 ,酚醛树脂
Abstract:
天然大分子木质素在超临界乙醇-甲酸介质中可以有效地降解为酚类化合物.超临界乙醇为木质素提供了理想的反应介质,甲酸热分解原位产生的氢作为木质素裂解自由基封端剂有效促进了降解向小分子转化;过渡金属盐可以催化降解反应.木质素超临界降解机理为自由基反应,在还原状态下氢可以对木质素自由基封端从而得到小分子化合物.木质素理想的超临界液化降解条件是乙醇∶甲酸=1∶1(W/W);木质素浓度10wt%;反应温度350℃;时间4h.木质素液化产物为小分子酚类衍生物,相比于木质素其溶解性和反应活性大幅提高.
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