Collect. Czech. Chem. Commun. 2008, 73, 637-648

Acid Hydrolysis of Olive-Pruning Debris for D-Xylose Production

Juan F. Garcíaa,*, Sebastián Sáncheza, Vicente Bravob, Luc Rigalc and Manuel Cuevasa

a Department of Chemical, Environmental and Materials Engineering, University of Jaén, Campus Las Lagunillas, 23071 Jaén, Spain
b Department of Chemical Engineering, University of Granada, Campus Universitario de Fuentenueva, 18071 Granada, Spain
c Laboratoire de Chimie Agro-Industrielle, Ecole Nationale Supérieure d'Ingénieurs en Arts Chimiques et Technologiques (Unité Mixte de Recherche 1010), 118 route de Narbonne, 31077 Toulouse Cedex 4, France


Selective hydrolysis of the hemicellulose fraction of olive-pruning debris was attempted in order to achieve a maximum yield of fermentable D-xylose without degrading the cellulose fraction. To this end, hydrolysis with a dilute acid was conducted in a heterogeneous stirred tank reactor at mild temperature (70-90 °C) and sulfuric acid concentration (0.0-0.5 mol l-1) for 300 min. Temperature was the determining factor in sugar formation and fiber conversion. The highest hemicellulose and cellulose conversion at 90 °C were 92.9 and 16.0%, respectively. From 100 g of the raw material, 35.8 g of sugars were recovered. At this temperature, using 0.5 M H2SO4 for 4.5 h, D-glucose and D-xylose yields of 13.1 and 10.4%, respectively, were obtained.

Keywords: Dilute acid hydrolysis; Hemicellulose; Olive-pruning debris; D-Xylose.

References: 18 live references.