Pyrolytic characteristics of acid hydrolysis residue from corncob
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摘要: 在热重分析仪和管式炉热解装置上对玉米芯酸水解残渣（简称残渣）的热解过程进行了研究，并利用气相色谱（GC），气相色谱-质谱联用(GC-MS)和扫描电镜(SEM)对热解产物进行了分析。热重分析结果表明，残渣的热裂解主要发生在280℃~ 450℃，仅在340.7℃有一个明显的失重峰。管式炉热解实验表明， 随着热解终温的升高，残渣的气相产物产率明显增加，而固相和液相产物产率均有所下降。GC分析结果表明，H2和CH4的产率随着热解终温的升高而升高，CO2产率呈现下降趋势; 与玉米芯热解气相产物相比，残渣热解CO、H2和CH4的产率较高，CO2产率较低。GC-MS结果表明，残渣热解焦油的主要成分为酚类物质和多环芳烃。SEM结果表明，随着热解终温的升高，残渣热解焦炭的表面结构趋于有序化。Abstract: Pyrolytic characteristics of acid hydrolysis residue from corncob (residue in short), were studied using thermal analyzer, tube furnace, gas chromatogram (GC), gas chromatogram-mass spectrometry (GC-MS) and scanning electronic microscopy (SEM). The thermogravimetric analysis shows that pyrolysis of the residue mainly occurs in 280℃~450℃ with only one obvious mass loss peak. The tube furnace test indicates that with increase of temperature gas yield increases greatly, while char and tar yield show decreasing trend. Among the gaseous products, with increase in temperature, H2 and CH4 increase, CO2 decreases; compared with corncob, the residue releases more CO, H2 and CH4, and less CO2 during pyrolysis. The main compounds identified through GC-MS are phenol and polycyclic aromatic hydrocarbons. SEM images show that char prepared at higher temperature is more uniformly crystallized.
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Key words:
- corncob /
- acid hydrolysis /
- residue /
- pyrolysis
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