Fluid Behavior of Woody Biomass Slurry during Hydrothermal Treatment

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• 作者：Nobusuke Kobayashi ; Nobuhiko Okada ; Yasuhiro Tanabe ; Yoshinori Itaya
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：April 6, 2011
• 年：2011
• 卷：50
• 期：7
• 页码：4133-4139
• 全文大小：888K
• 年卷期：v.50,no.7(April 6, 2011)
• ISSN：1520-5045

文摘

Hydrothermal experiment of woody biomass was carried out in an autoclave, and a property change of the woody slurry associated with hydrothermal reaction was analyzed. The reaction conditions, such as reaction temperature, reaction period, and slurry concentration, were varied in this experiment, and the effect of the hydrothermal conditions on the slurry characteristics was evaluated. To evaluate the property change of the woody slurry, apparent viscosity, particle size, pH, and 味 potential measurements of the hydrothermally influenced slurry were conducted. The fluid resistance of the slurry during hydrothermal experiment was also measured with an autoclave reactor. With application of hydrothermal treatment on a woody slurry, significant change of the slurry property was observed. The particle size decreased during hydrothermal experiment with increasing reaction temperature, and this particle size change influenced the slurry behavior. Due to the particle size reduction, the apparent viscosity of the treated slurry became smaller, and the treated slurry showed strong pseudoplastic fluid behavior. With a longer reaction period, the particle size was getting smaller by the hydrolysis reaction; however, particle size enlargement caused by a swelling and/or agglomeration occurred when the reactor鈥檚 temperature started to increase. This particle size enlargement behavior at the beginning of the hydrothermal experiment increased the fluid resistance of the slurry significantly. pH value and the 味 potential value were also influenced by the hydrothermal treatment. pH and absolute 味 potential values dropped with increasing reaction temperature; however, the absolute 味 potential value of the slurry reversely increased when the reaction temperature was over 523 K. The increment of carboxyl radical on the surface of the reacted particle changed particle鈭抪article and particle鈭抯olvent interactions.