Microwave effects in the dilute acid hydrolysis of cellulose to 5-hydroxymethylfurfural

Scientific Reports
Nick SweygersLise Appels

Abstract

In this study, the effect of microwaves on the production of 5-hydroxymethylfurfural (HMF) in a biphasic system was evaluated via a kinetic analysis. The reaction system consisted of an acidified aqueous phase and methyl isobutyl ketone (MIBK) as an organic phase, in which HMF is extracted directly upon formation during the reaction. Two identically shaped reactors were used to assess the influence of microwaves on the production of HMF. A borosilicate glass reactor was used to heat the reaction mixture via microwaves directly, whereas the silicon carbide (SiC) wall of the second reactor absorbed all microwaves and hence the reactor content was heated via convective heat transfer. An identical temperature profile was imposed on both reactors. Cellulose, glucose and fructose were chosen as feedstocks for the conversion to HMF. It was observed that microwaves have a significant effect on the reactions. The hydrolysis of cellulose to glucose was a 2.3 folds faster in the presence of microwaves at the process conditions (0.046 M HCl, 177 °C). The isomerization of glucose to fructose showed a similar increase (factor 2.5). The required energy input for the reaction was systematically higher for the SiC reactor.

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Citations

May 16, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Yang ZhouKai Fang
Aug 9, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Frederic Delbecq, Christophe Len
Aug 2, 2019·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Michela SignorettoFederica Menegazzo
Mar 8, 2021·The Science of the Total Environment·Jianglong LiuXiming Zhang

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