Two-step pyrolysis of corncob for value-added chemicals and high quality bio-oil: Effects of pyrolysis temperature and residence time

被引:52
|
作者
Zhang, Liqiang [1 ]
Li, Shanshan [1 ]
Li, Kai [1 ]
Zhu, Xifeng [1 ]
机构
[1] Univ Sci & Technol China, Dept Thermal Sci & Energy Engn, 96 Jinzhai Rd, Hefei 230026, Anhui, Peoples R China
基金
中国国家自然科学基金;
关键词
Two-step pyrolysis; Pyrolysistemperature; Residence time; Value-added chemicals; Py-GC/MS; GAS CHROMATOGRAPHY/MASS SPECTROMETRY; FLUIDIZED-BED REACTOR; PY-GC/MS; TG-FTIR; CATALYTIC PYROLYSIS; LIGNOCELLULOSIC BIOMASS; FURFURAL PRODUCTION; CO-PYROLYSIS; ACETIC-ACID; RICE STRAW;
D O I
10.1016/j.enconman.2018.04.002
中图分类号
O414.1 [热力学];
学科分类号
摘要
The effects of the first step pyrolysis temperature (T1) and residence time (RT1) on the two-step pyrolysis (TSP) were investigated by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS), and thermogravimetric analyzer coupled with FTIR spectrophotometer (TG-FTIR) was used to analyze the pyrolysis characteristics of corncob. T1 was classified into low temperature (T1-L: 250 degrees C, 300 degrees C and 350 degrees C), medium temperature (T1-M: 400 degrees C and 450 degrees C) and high temperature (T1-H: 500 degrees C and 550 degrees C). Compared with one-step pyrolysis (OSP), T1 -M was the optimal condition in TSP to increase the selectivities of value-added chemicals such as acetic acid, furfural, 4-vinylphenol, 2-methoxy-4-vinylphenol and guaiacol, etc. Few acids and more hydrocarbons with content of 10.54% were acquired in the second step at T1-M, which was conducive to improving the quality of bio-oil. Different RT1 at T1-M could further increase the selectivities of specific products such as furfural at T1 of 450 degrees C with 10 s, toluene at T1 of 450 degrees C with 20 s, and acetic acid, 4-vinylphenol, 2-methoxy-4-vinylphenol and vanillin at T1 of 450 degrees C with 5 s, etc. Based on the results, a new polygeneration approach of TSP for efficient utilization of biomass was proposed.
引用
收藏
页码:260 / 267
页数:8
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