title: Improving bioethanol production from olive pruning biomass by deacetylation step prior acid hydrolysis and fermentation processes.
abstract: In order to produce bioethanol from olive tree pruning biomass, deacetylation was performed employing sodium hydroxide. Optimal conditions were determined using experimental design techniques. The highest acetic acid removal (3.8g/dm(3)), obtained by response surface methodology, was at optimum pretreatment conditions of temperature 60°C, 0.8% NaOH and residence time 60min. After oxalic acid hydrolysis of pretreated biomass, the hydrolysates were directly used for ethanol production without further detoxification process. Ethanol yields ranged from 0.19 to 0.45g/g, reaching the maximum yield value when pretreatment was carried out at 130°C with 100mM oxalic acid, involving a combined severity factor (CSF) of 1.05. The highest ethanol concentration obtained from pretreated biomass was 6.2g/dm(3) at 150°C, using 75mM of oxalic acid (CSF=1.53).
authors: Department of Chemical, Environmental and Materials Engineering, University of Jaén, 23071 Jaén, Spain. Electronic address: ajmoya@ujaen.es.
authors: Alberto J
authors: AJ
authors: Moya
authors: Department of Chemical, Environmental and Materials Engineering, University of Jaén, 23071 Jaén, Spain.
authors: Silvia
authors: S
authors: Peinado
authors: Department of Chemical, Environmental and Materials Engineering, University of Jaén, 23071 Jaén, Spain.
authors: Soledad
authors: S
authors: Mateo
authors: Departamento de Farmácia, Faculdades Integradas Teresa DÁvila (FATEA), 12.606-580 Lorena, Brazil.
authors: Bruno G
authors: BG
authors: Fonseca
authors: Department of Chemical, Environmental and Materials Engineering, University of Jaén, 23071 Jaén, Spain.
authors: Sebastián
authors: S
authors: Sánchez
mesh_terms: D019342:Acetic Acid / Q000737:chemistry / Q000302:isolation & purification; D000107:Acetylation; D000383:Agriculture / Q000379:methods*; D056804:Biofuels; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D000431:Ethanol / Q000737:chemistry / Q000378:metabolism*; D005285:Fermentation; D006868:Hydrolysis; D031658:Olea / Q000737:chemistry*; D019815:Oxalic Acid / Q000737:chemistry; D010843:Pichia / Q000378:metabolism; D018520:Plant Shoots / Q000737:chemistry; D012972:Sodium Hydroxide; D013696:Temperature
chemical_list: D056804:Biofuels; D000431:Ethanol; D012972:Sodium Hydroxide; D019815:Oxalic Acid; D019342:Acetic Acid
keywords: Deacetylation; Ethanol; Fermentation; Oxalic acid; Pretreatment