46E-2 |
Xylose from hydrolysis of sugar cane bagasse using hydrochloric acid at autoclave pressure |
J. A. RAMÍREZ, G. Bustos, and M. Vázquez. Dept. of Food Science & Technology, Univ. Autonoma de Tamaulipas, UAM Reynosa-Aztlán, Calle 16 y Lago de Chapala. Col Aztlán, Reynosa, Tamaulipas, 88740, Mexico Xylose obtained from the hemicellulosic hydrolysis of sugar cane bagasse can be used for its conversion to xylitol or single cell protein. The product of the hydrolysis is a solution containing mainly sugars such as xylose, glucose, but also furfural and acetic acid as degradation products. The objective of this work was evaluated the hydrolysis of sugar cane bagasse using hydrochloric acid at 122 şC to obtain solutions with a maximum xylose concentration and minimum concentration of microbial growth inhibitor (acetic acid and furfural). The raw material used in experiments was sugar cane bagasse collected in a local industry. Sugar cane bagasse was 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 and furfural was determined by UV-Vis spectrometry. Analyses of the main fractions (cellulose, hemicelluloses and Klason lignin) were carried out using a quantitative acid hydrolysis under standard conditions. Treatments were performed at 122 şC in media containing 2, 4 or 6 % HCl. Kinetic models were developed to explain the time course of xylose, glucose, acetic acid and furfural generated A maximum xylose concentration (18.9±4.0 g/L) was obtained after 3 hour of reaction time using 2% of hydrochloric acid. In this condition, 2.0±0.1 g furfural/l and 4.8±0.9 g acetic acid/L was also obtained. The models predicted a maximum xylose concentration (22.6 g/L) using 6% HCl after 107 min. In these conditions, it was also predicted 6.04 g glucose/L, 5.93 g acetic acid/L and 4.55 g furfural/L. The results showed that it is possible obtain xylose solutions from sugar cane bagasse using hydrochloric acid.
Session 46E, International
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