生物油蒸馏残渣理化性质及热失重研究

利用傅里叶变换红外光谱仪、激光共焦显微拉曼光谱仪和TGA Q500热分析仪对生物油蒸馏残渣及其在不同温度处理后的热解焦炭理化性质进行表征,并对其热失重特性进行分析。结果表明,生物油蒸馏残渣主要是由脂肪族、芳香族和低聚糖类等有机化合物组成;在氮气氛围下热解主要分为三个阶段:30-145℃为小分子物质挥发析出阶段145-550℃为大分子物质裂解和氧化阶段,550-750℃为焦炭产生阶段;热处理过程中各类物质逐步有序热解析出,同时固体产物石墨化程度随着热处理终止温度的升高而升高。

Physicochemical characteristics and TGA of distillation residues from bio-oil

The distillation residues from bio-oil and the pyrolysis char obtained at different temperatures were investigated with FT-IR, Raman spectra and TGA. The results show that the distillation residues from bio-oil consist of aliphatic, aromatic and oligosaccharides. The process of thermal weight loss of distillation residues from bio-oil in nitrogen can be separated into three stages. The first is the volatilization of low-boiling point compounds from ambient temperature to 145℃. The second is the pyrolysis, oxidation and polymerization of the heavy compounds at higher temperature and the last is the formation and combustion of coke. The graphitic carbon fraction increases with increasing the carbonization temperature while the disordered carbon amount decreases.