RT journal article
T1 Sequential Acid/Alkali Pretreatment for an Olive Tree Pruning Biorefinery
A1 Díaz Villanueva, Manuel Jesús
A1 Ferrero, Pedro M.
A1 Moya, Manuel
A2 Ingeniería Química y Tecnología de Alimentos
K1 alkaline
K1 bioethanol
K1 dilute acid
K1 Escherichia coli SL100
K1 olive tree pruning
K1 severity factor
AB Olive tree pruning is an abundant and renewable lignocellulosic residue, which is generally burned in the fields, causing economic costs and environmental problems. This lignocellulosic residue can be considered a suitable raw material for the production of a wide range of byproducts in a biorefinery context due to its high content of potentially fermentable carbohydrates. To take advantage of its sugar content, pretreatment is necessary to enhance the accessibility of the enzymes to the cellulosic fraction. The aim of this work is to obtain sugars contained in olive tree pruning as a substrate for the production of bioethanol by fermentation. Specifically, the production of fermentable sugars by sequential pretreatment with sulfuric acid and sodium hydroxide is studied. A two-factor rotatable composite central design temperature and catalyst concentration (H2SO4 and NaOH) has been generated, and response surface methodology has been used to discuss and optimize the responses. This work shows that under optimal pretreatment conditions (130 °C, 1.90% w/v H2SO4 and 130 °C, 1.49% w/v NaOH) of 1 kg of olive tree pruning, a solution rich in sugars (102 g of glucose and 61 g of xylose) and a solid residue generating 99 g of glucose by enzymatic hydrolysis is obtained. Moreover, applying the combined severity to the acid pretreatment, it has been determined that 20% of the olive tree pruning is fast solubilization, and it was also found that the apparent activation energy of the acid hydrolysis reaction is 85.07 kJ/mol.
PB Multidisciplinary Digital Publishing Institute (MDPI)
SN 2073-4395
YR 2023
FD 2023
LK http://hdl.handle.net/10498/31482
UL http://hdl.handle.net/10498/31482
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026