Evolution Process and Controlled Synthesis of Humins with 5‐Hydroxymethylfurfural (HMF) as Model Molecule
作者:Haiyan Shen、Haozhe Shan、Li Liu
DOI:10.1002/cssc.201902799
日期:2020.2.7
of 5-hydroxymethylfurfural (HMF)-derived humins were captured, revealing multiple elementary reactions such as etherification, esterification, aldol condensation, and acetalization. Through humin characterization, it was found out that the aldol condensation moiety between aldehyde group and levulinic acid is critical to justify the characteristic IR peaks (1620 and 1710 cm-1 ) and aromatic fragments
阐明腐殖质的化学结构和形成机理是进一步提高酸催化生物质转化效率的必要条件。通过低温方法,捕获了导致形成5-羟甲基糠醛(HMF)腐殖质的关键中间体,从而揭示了多种基本反应,例如醚化,酯化,羟醛缩合和缩醛化。通过腐殖质表征,发现醛基和乙酰丙酸之间的醛醇缩合部分对于证明热解GC-MS的特征IR峰(1620和1710 cm-1)和芳族碎片至关重要。基于HPLC-MS / MS,IR,热解GC-MS和SEM等方面的研究,提出了不同温度下腐殖质的结构模型,由关键中间体确定的基本反应类型组成。可以在不同的反应条件(温度和时间)下可控地合成具有不同羟醛缩合含量的腐殖质结构,证明了HMF衍生的腐殖质的演化过程。