Journal
CHEMICAL ENGINEERING JOURNAL
Volume 335, Issue -, Pages 221-230Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.10.112
Keywords
Glucose decomposition; 5-Hydroxymethyl furfural; Levulinic acid; Acidic functionalized ionic liquid; Kinetics and thermodynamic parameters
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Funding
- Universiti Teknologi Malaysia [02E54]
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Decomposition of biomass feedstock is a promising technique for producing versatile chemicals such as 5-hydroxymethyl furfural (5-HMF) and levulinic acid (LA). Glucose, the model compound of cellulose, is one of the most important starting components for bio-based chemical synthesis. Herein, the kinetics of glucose decomposition catalyzed by an acidic functionalized ionic liquid, 1-sulfonic acid-3-methyl imidazolium tetrachloroferrate ([SMIM][FeCl4]) was studied in the temperature range of 110-170 degrees C. A simplified kinetic model was developed based on pseudo-homogeneous first-order reactions. The kinetic model consists of four main key steps: (1) dehydration of glucose to 5-HMF; (2) degradation of glucose to humins; (3) rehydration of 5-HMF to LA; and (4) degradation of 5-HMF to humins. The proposed model was in a good agreement with the experimental results. The evaluated activation energies for glucose decomposition to 5-HMF and 5-HMF decomposition to LA were 37 and 30 kJ center dot mol-1, respectively. The first-order rate constants were also used to calculate the thermodynamic activation parameters. The kinetic and thermodynamic parameters obtained can be applied to provide insights on the biomass decomposition to 5-HMF and LA using acidic ionic liquid.
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