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Kinetics of the pyrolytic and hydrothermal decomposition of water hyacinth

Luo, Guang’en, James Strong, P., Wang, Hailong, Ni, Wuzhong, Shi, Weiyong
Bioresource technology 2011 v.102 no.13 pp. 6990-6994
Eichhornia crassipes, activation energy, biomass, cellulose, hemicellulose, hot water treatment, pyrolysis, solubilization, temperature, thermogravimetry, volatilization
The kinetics of water hyacinth decomposition using pyrolysis and hydrothermal treatment was compared. With pyrolysis, initial vaporization occurred at 453K as determined by thermogravimetric analysis, while initial solubilisation occurred at 433K with subcritical hydrothermal treatment. The “kinetic triplet” was determined for the ranges of 423–483K (range I) and 473–553K (range II) using the Coats–Redfern method for both treatments. The calculated activation energies for ranges I and II were 110 and 116kJ/mol for conventional pyrolysis and 145 and 90kJ/mol for hydrothermal treatment. The similar activation energies for the two temperature ranges observed for pyrolysis implied that only hemicellulose decomposition occurred. For hydrothermal treatment, both hemicellulose and cellulose decomposition occurred in temperature range II, in which a notable lower activation energy was observed. This implied hydrothermal treatment was more suitable for conversion lignocellulosic biomass under these conditions.