fevereiro 2015 vol. 1 num. 2 - XX Congresso Brasileiro de Engenharia Química

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DETERMINATION OF THE GIANT-BAMBOO PYROLYSIS KINETIC PARAMETERS

HOMRICH, P. O. B.; TOSS, D.; GODINHO, M.; PERONDI, D.; BROETTO, C.; FERRARINI, F.;

Artigo:

The kinetics involved in giant bamboo thermal degradation under N2 atmosphere was investigated through non-isothermal thermogravimetric analyses (TGA) and derivative thermogravimetry (DTG) applying three isoconversional methods: Coats and Redfern (CR), MacCallum and Tanner (MT), and van Krevelen (VK). Besides that, samples characterization was conducted by van Soest’s method and by proximate analysis. The TGA experiments were performed with a N2 rate of 50 mL/min and five different heating rates were used: 5, 10, 15, 25 and 50 °C/min, for a samples aged 5.5 years. The van Soest’s test indicated that the giant bamboo is composed of up to 73% of cellulose and the proximate analysis showed up to 84% of volatile matter. The highest weight loss region evaluated by the DTG was between 200-450°C, corresponding to a weight loss range of 10-85% in mass. The Coats-Redfern’s fitting-model indicated that two-dimensional diffusion was the mechanism which best describes the pyrolysis process in the highest weight loss region. The kinetic parameters determined by CR’s, MT’s, and MT’s methods, respectively, varied between 136 and 150 kJ/mol for the activation energy and between 2.75×1010 and 3.6×1011 s-1 for the pre-exponential factor. Comparing the calculated and experimental weight loss, was verified that the CR’s and MT’s average deviations were lower than the evaluated by VK’s method, indicating that the CR’s and MT’s describe better the giant bamboo pyrolysis.

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DOI: 10.5151/chemeng-cobeq2014-0888-22805-182639

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Como citar:

HOMRICH, P. O. B.; TOSS, D.; GODINHO, M.; PERONDI, D.; BROETTO, C.; FERRARINI, F.; "DETERMINATION OF THE GIANT-BAMBOO PYROLYSIS KINETIC PARAMETERS", p. 10260-10267 . In: Anais do XX Congresso Brasileiro de Engenharia Química - COBEQ 2014 [= Blucher Chemical Engineering Proceedings, v.1, n.2]. São Paulo: Blucher, 2015.
ISSN 2359-1757, DOI 10.5151/chemeng-cobeq2014-0888-22805-182639

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