46E-3 |
Hydrolysis of sugar cane bagasse with sulphuric acid at atmospheric pressure |
R. Aguilar1, J. A. Ramírez2, and M. VÁZQUEZ2. (1) Dept. of Food Science, Univ. Autónoma de Tamaulipas, UAM Mante, Ciudad Mante, Tamaulipas, 89840, Mexico, (2) Dept. of Food Science & Technology, Univ. Autónoma de Tamaulipas, UAM Reynosa-Aztlán, Reynosa, Tamaulipas, 88700, Mexico Sugar cane bagasse is a renewable and cheap waste generated in Mexico. This material has a high content in xylose. It is interesting the bioconversion from xylose to xylitol, a polyol with important applications as sweetener. The economic interest in the xylitol production can be enhanced if the needed xylose solutions can be obtained from the hydrolysis of low-cost lignocellulosic wastes, such as sugar cane bagasse. The objective of this work was to study the xylose production from sugar cane bagasse with sulphuric acid hydrolysis at atmospheric pressure (100 ºC) to obtain solutions with a maximum xylose concentration and minimum concentration of furfural and acetic acid (growth inhibitors). The effect of several sulphuric acid concentrations (2,4 and 6%) and several time reaction (0-300 min) were evaluated in the hydrolysis of sugar cane bagasse. Kinetic models were developed to explain the time course of xylose, acetic acid and furfural generated in the hydrolysis. Sugar cane bagasse was collected in a local industry (Ingenio Azucarero de Mante, Tamaulipas, México). The sugar cane bagasse were air dried, milled, screened to select the fraction of particles with a size lower than 0.5 mm, homogenized in a single lot and stored until needed. Moisture was determined gravimetrically, xylose, and acetic acid were determined by HPLC with IR detector, and furfural was determined by UV-Vis spectrometry. The concentration of xylose increased with sulphuric acid concentration and reaction time. The model used to determine the kinetic parameters of the hydrolysis was the Saeman´s model. Hydrolysates with up to 20.7 g xylose/L, 4.14 g acetic acid/L and 1.97 furfural/L were obtained using the severe conditions (6% sulphuric acid and 300 min),. The results showed that it is possible to obtain xylose solutions from sugar cane bagasse with low concentrations of growth inhibitors for its use as fermentation media.
Session 46E, International
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