Kinetic study of 5-Hydroxymethylfurfural synthesis from fructose in high pressure CO2–Water two-phase system

Abstract : In this work, synthesis of 5-hydroxymethylfurfural (5-HMF) from lignocellulosic biomass derived hexoses, fructose in our case, was developed in two-phase supercritical CO2–water systems. Conditions of reactions were above 10 MPa and 120 °C, i.e., the two-phase reacting mixture can be regarded as a subcritical water–supercritical CO2 system. From kinetic experiments and their modeling, it was possible to assess the effect of CO2 as a potential reversible acid catalyst. The kinetic model developed in this study considers also the catalytic contribution of acid byproducts, as proton providers, for the reaction of dehydration of fructose into 5-HMF. Selectivity toward 5-HMF was improved with increasing pressure to reach a maximum of 80 mol % after 3 h of reaction at 150 °C and under 25 MPa of CO2, as only 60% was achieved without the use of pressurized CO2.
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Hélène Labauze, Séverine Camy, Pascal Floquet, Bouchra Benjelloun-Mlayah, Jean-Stéphane Condoret. Kinetic study of 5-Hydroxymethylfurfural synthesis from fructose in high pressure CO2–Water two-phase system. Industrial and engineering chemistry research, American Chemical Society, 2019, 58 (1), pp.92-100. ⟨10.1021/acs.iecr.8b04694⟩. ⟨hal-02135793⟩

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