posted on 2021-07-13, 12:37authored byIvan Kristianto, Brian S. Haynes, Alejandro Montoya
The
hydrothermal decomposition of glucose in the presence of ammonium
is investigated under a subcritical water condition between 220 and
280 °C using a microtubular flow reactor at short residence times
(0.5–2 s) to evaluate the evolution of primary and secondary
products. The consumed ammonium is mainly transformed into pyrazines,
while other typical products of glucose such as fructose, glyceraldehyde,
dihydroxyacetone, formic acid, acetic acid, 5-hydroxymethylfurfural
(5-HMF), and furfural are also generated. For the first time, the
effect of the reactant concentration, residence time, and reaction
temperature on the formation of pyrazines is investigated. The kinetics
of glucose decomposition was evaluated through a self-decomposition
path and through interaction with ammonium, resulting in activation
energies of 85.6 ± 6.7 and 97.4 ± 20.5 kJ mol–1, respectively.