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Study on the thermal degradation behaviors and kinetics of alkali lignin for production of phenolic-rich bio-oil using TGA-FTIR and Py-GC/MS

机译:TGA-FTIR和Py-GC / MS研究碱性木质素在富酚生物油生产中的热降解行为和动力学

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摘要

Alkali lignin, an aromatic polymer extracted from soda pulping black liquor, is considered to be a potential source of phenolic-rich bio-oil using pyrolysis technology. This paper investigated the pyrolysis behaviors and kinetics of alkali lignin using thermogravimetric analyzer coupled with Fourier transform infrared spectrometry (TGA-FTIR) and pyrolyzer coupled with gas chromatography/mass spectrometer (Py-GC/MS). Results showed that the pyrolysis process of alkali lignin consisted of the three stages: drying stage, fast degradation stage and slow degradation stage. The weight loss rate reached its maximum value of 0.2448 mass%/degrees C at the temperature of 327 degrees C. The aromatics (at 1512 cm(-1)) and phenols (at 1261 cm(-1)) were the dominant volatile components according the FTIR spectrum. As the conversion rate increased from 0.05 to 0.9, the activation energy estimated from Flynn-Wall-Ozawa (FWO) method, was raised from 124 to 721 kJ mol(-1). The phenolic compounds, namely guaiacol type (G-), the phenol type (P-), the syringol type (S-), and the catechol type (C-) were the main products from Py-GC/MS experiment. The total phenols and the G-type phenols reached their maximum contents of 78% and 63.43% at 500 degrees C, respectively. The content of S-type phenols decreased from 17.63% to 10.2% as the temperature increasing from 400 degrees C to 700 degrees C, while the contents of P-type and C-type phenols increased from 0.81% to 8.16% and 0.12% to 3.11%, respectively. (C) 2015 Elsevier B.V. All rights reserved.
机译:从碱法制浆黑液中提取的芳香族聚合物碱木质素被认为是利用热解技术富含酚类生物油的潜在来源。本文利用热重分析仪结合傅里叶变换红外光谱法(TGA-FTIR)和热解仪结合气相色谱/质谱仪(Py-GC / MS)研究了碱木质素的热解行为和动力学。结果表明,碱木质素的热解过程包括三个阶段:干燥阶段,快速降解阶段和缓慢降解阶段。失重率在327摄氏度时达到0.2448质量%/摄氏度的最大值。芳族化合物(在1512 cm(-1)处)和苯酚(在1261 cm(-1)处)是主要的挥发性成分根据FTIR光谱。随着转化率从0.05增加到0.9,根据Flynn-Wall-Ozawa(FWO)方法估算的活化能从124 kJ mol(-1)升高。 Py-GC / MS实验的主要产物是愈创木酚型(G-),苯酚型(P-),丁香酚型(S-)和邻苯二酚型(C-)。在500℃下,总酚和G-型酚的最大含量分别达到78%和63.43%。随着温度从400摄氏度增加到700摄氏度,S型酚的含量从17.63%下降到10.2%,而P型和C型酚的含量从0.81%上升到8.16%和0.12%。分别为3.11%。 (C)2015 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Journal of Analytical & Applied Pyrolysis》 |2016年第1期|116-124|共9页
  • 作者单位

    Zhejiang Agr & Forestry Univ, Sch Engn, Linan 311300, Zhejiang, Peoples R China|Key Lab Wood Sci & Technol Zhejiang Prov, Linan 311300, Zhejiang, Peoples R China;

    Zhejiang Agr & Forestry Univ, Sch Engn, Linan 311300, Zhejiang, Peoples R China|Key Lab Wood Sci & Technol Zhejiang Prov, Linan 311300, Zhejiang, Peoples R China;

    Zhejiang Agr & Forestry Univ, Sch Engn, Linan 311300, Zhejiang, Peoples R China|Key Lab Wood Sci & Technol Zhejiang Prov, Linan 311300, Zhejiang, Peoples R China;

    Zhejiang Agr & Forestry Univ, Sch Engn, Linan 311300, Zhejiang, Peoples R China|Key Lab Wood Sci & Technol Zhejiang Prov, Linan 311300, Zhejiang, Peoples R China;

    Zhejiang Agr & Forestry Univ, Sch Engn, Linan 311300, Zhejiang, Peoples R China|Key Lab Wood Sci & Technol Zhejiang Prov, Linan 311300, Zhejiang, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Alkali lignin; Pyrolysis; Bio-oil; Kinetics; TGA-FTIR; Py-GC/MS;

    机译:碱木质素;热解;生物油;动力学;TGA-FTIR;Py-GC / MS;
  • 入库时间 2022-08-18 03:01:48

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