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Experimental and Kinetic Modeling Studies on the Conversion of Sucrose to Levulinic Acid and 5-Hydroxymethylfurfural using Sulfuric Acid in Water
We here report experimental and kinetic modeling studies on the conversion of
sucrose to levulinic acid (LA) and 5-hydroxymethylfurfural (HMF) in water using sulfuric acid
as the catalyst. Both compounds are versatile building blocks for the synthesis of various
biobased (bulk) chemicals. A total of 24 experiments were performed in a temperature
window of 80 - 180°C, a sulfuric acid concentration between 0.005 and 0.5 M, and an initial
sucrose concentration between 0.05 and 0.5 M. Glucose, fructose and HMF were detected
as the intermediate products. The maximum LA yield was 61 mol%, obtained at 160°C, an
initial sucrose concentration of 0.05 M and an acid concentration of 0.2 M. The maximum
HMF yield (22 mol%) was found for an acid concentration of 0.05 M, an initial sucrose
concentration of 0.05 M and a temperature of 140°C. The experimental data were modeled
using a number of possible reaction networks. The best model was obtained when using a
first order approach in substrates (except for the reversion of glucose) and agreement
between experiment and model was satisfactorily. The implication of the model regarding
batch optimization is also discussed.
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