Kinetic characterization for pretreatment of timber varieties and switchgrass using diluted acid hydrolysis

Acid hydrolysis of hemicellulose from Ipomoea arborescens: kinetics of xylose production

“…The experimental conditions in this study were established based on the review of published work related to acid hydrolysis of lignocellulosic materials (Brennan, 2004;Yat, 2006;Morinelly, 2009). Results from literature agree on the fact that the degradation of products increases at higher temperature and acid concentrations; given the experimental conditions of this work, these effects are going to be presented.…”

“…The combination of the study of the composition of Ipomoea arborescens particles, the experimental data obtained in acid hydrolysis and the comparison of the calculated data from the solution of the pseudo-homogeneous kinetic model for the acid hydrolysis allowed to correlate adequately the acid hydrolysis under controlled laboratory conditions. From the composition, the stoichiometric factor for the hemicellulose was obtained, which is included in the acid hydrolysis reaction as well as the values of the apparent rate constants for the formation Ea 1 =65.9∼167.9, Ea 2 =165.59 basswood γ Ea 1 =102.6∼179.13 "Tilia americana" Ea 2 =165.59 º (Canettieri E. V., 2007) * (Yat, 2006) γ and degradation of xylose. The mathematical model adequately predicted the experimental concentrations, presenting mainly an adequate correlation with the study temperature.…”

“…In order to neglect the mass transfer and ensure perfect mixing, the stirring speed of the reactor was set at 600 rpm. The overall reaction time was established as a function of the xylose, the main product of the hydrolysis, at 60 minutes because after this time a degradation process begins (Yat, 2006).…”

“…Acid hydrolysis allows accessing the cellulose that is covered with hemicellulose, thus recovering xylose as the main product of hemicellulose hydrolysis (Sun, 2002;Neureiter, 2004;Saha B. C., 2005;Yang, 2009;Ashutosh Mittal, 2019). In the literature, research work has focused on describing the kinetics of xylose production using homogeneous models for the hydrolysis reaction with sulfuric acid (Jacobsen, 2000;Neureiter, 2004;Yat, 2006;Yang, 2009;Morinelly, 2009;Jeong, 2010;Sediawan, 2010;Hu, 2010;Riansa-Ngawong, 2011). Previous studies of lignocellulosic materials include grass, forest and agricultural residues, and soft and hard woods have shown a real possibility of replacing the current raw materials such as sugar cane and corn Mousdale, 2008;Bessou, 2011;Saucedo-Luna J. C.-M.-P.-A.-G., 2011;Sánchez, 2011;Komolwanich, 2014;Fernandes, 2021).…”

“…This paper presents Ipomoea arborescens as a potential raw material to produce ethanol. Ipomoea arborescens is a wild tree that grows in the Sonoran desert in Northwest Mexico and in the north of Sinaloa; it is also known as morning-glory tree, and for its Spanish names: palo blanco, palo santo and casahuate (Meyer, Bertelsen, & Devender, 2003-2006. During extreme dry seasons, local farmers feed their cattle with Ipomoea arborescens.…”