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Browsing by Author "Demirbas, A"

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    Biomass Conversion Processes
    (Pergamon-elsevier Science Ltd, 1997) Kucuk, MM; Demirbas, A
    Three different biomass conversion processes, thermochemical, chemical and biochemical, are reviewed based on the results of some investigations. The important parameters for thermochemical processes are temperature, pressure, time at reaction conditions and added reactants or catalysts, for chemical processes are acid concentration, prehydrolysis, temperature, time at reaction conditions and kind and moisture of used material and for biochemical processes are reaction temperature, pH, moisture and time at reaction conditions. Copyright (C) 1996 Elsevier Science Ltd
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    Article
    Kinetic Study on Hydrolysis of Biomass (Ailanthus Altissima Chips) by Using Alkaline-Glycerol Solution
    (Pergamon-elsevier Science Ltd, 1999) Küçük, MM; Demirbas, A
    This paper is about the kinetics of hydrolysis of biomass (Ailanthus altissima) using an aqueous alkaline-glycerol solution. The study was performed at four temperature levels (438, 458, 478 and 498 K) and for different times (1, 2, 3, 4, 5, 6, 7 and 8 hours). The solution concentration was constant (75 g glycerol, 25.0 g water, 10% NaOH and 10.0 g wood chips). After conversion has been determined, the fractional weight loss (-1/W-0 dW/dt) was found to be a function of the amount of wood residue (f(W)) and the reaction rate constant (k). The order of reaction (n) and activation energy (E-a) were calculated. The results were, respectively, 1.32 x 10(-2) s(-1), 1.16, and 19.5 kJ mol(-1) (C) 1999 Elsevier Science Ltd. All rights reserved.