01965nas a2200169   4500008004100000022001400041245010400055210006900159260000900228300001400237490000600251520132700257100002901584700002401613700002601637856013201663       2023                        eng d  a2058-988300aReaction pathways and kinetics of N-acetyl-d-glucosamine hydrolysis in sub- and supercritical water0 aReaction pathways and kinetics of Nacetyldglucosamine hydrolysis  cMAY   a1097-11080 v83 a<p>
	Subcritical and supercritical water hydrolysis of N-acetyl-d-glucosamine (NAG) to value-added chemicals has been studied in detail. Experiments were carried out using a continuous flow reactor by varying temperature (250-400 degrees C), pressure (5-25 MPa) and residence time (2-60 s). A wide product distribution was obtained during the reactions, including solid, liquid and gaseous compounds, sensitive to the state of water: sub- or supercritical. Subcritical conditions promoted the formation of solid compounds, whereas gasification was favored in supercritical water. The prominent products present in the liquid fraction were glycolic acid, acetic acid, formic acid, 5-HMF and acetamide. The formation of a few distinct nitrogen-containing heterocyclic compounds was observed only in supercritical water. Following instantaneous deacetylation of NAG, several oxidation, reduction and secondary reactions occur during hydrolysis of NAG in subcritical and supercritical water. A kinetic model for the prediction of yields of acetic acid, glycolic acid and formic acid is developed. The network of reactions showed specifc deviations from conventional understanding. The current findings show that it is possible to develop a suitable process to make a set of value-added chemicals from chitinous biomass.</p>
1 aKulkarni, Sphurti, P. P.1 aJoshi, Sunil, S. S.1 aKulkarni, Amol, A. A.  uhttps://library.ncl.res.in/content/reaction-pathways-and-kinetics-n-acetyl-d-glucosamine-hydrolysis-sub-and-supercritical-water