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 CO 2 −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 CO 2 system. From kinetic experiments and their modeling, it was possible to assess the effect of CO 2 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 CO 2 , as only 60% was achieved without the use of pressurized CO 2 .

Synthesis and Characterization of Phenol Furfural Resin from Moringa Oleifera Gum and Biophenol and Its Application in Styrene Butadiene Rubber

“…Cellulose and hemicelluloses are abundant in nature and they are the main components of biowastages . Acid hydrolysis of these biowastes forms sugars. − Polysaccharides are one of the constituents of natural gums like exudates of the Moringa oleifera tree .…”

“…25 Yuan et al noted the conversion of HMF in the presence of CrCl 2 /CrCl 3 /tetraethylammonium chloride as catalyst. 20 Cellulose and hemicelluloses are abundant in nature 26 and they are the main components of biowastages. 27 Acid hydrolysis of these biowastes forms sugars.…”

Recent Advances in the Catalytic Upgrading of Biomass Platform Chemicals Via Hydrotalcite-Derived Metal Catalysts

“…HMF is one of the key platform chemicals given its convenient preparation and unique structure with different functional groups [35,36]. HMF can be produced via acid (e.g., H 2 SO 4 [37], H 3 BO 3 [38], and CO 2 [39])-catalyzed dehydration of fructose. However, considering its high cost, more studies shifted to the direct conversion of glucose [40] in recent years.…”

Determination of mass transfer coefficients in high-pressure CO2-H2O flows in microcapillaries using a colorimetric method

“…The use of supercritical fluids (fluids under temperature and pressure conditions above those of their critical point) in liquidfluid extraction (Conde-Hernández et al, 2017;Yousefi et al, 2019), multiphase reaction (Ou et al, 2019;Labauze et al, 2018), particle generation processes (Abuzar et al, 2018;Cheng et al, 2017) or even in analytical chemistry (DaSilva et al, 2020;Roy et al, 2020) is more and more widespread. Indeed, supercritical fluids have specific properties (i.e.…”