title: Acidic processing of hemicellulosic saccharides from pine wood: product distribution and kinetic modeling.
abstract: Water soluble compounds were removed from Pinus pinaster wood by a mild aqueous extraction, and the treated wood was subjected to hydrothermal processing to convert most hemicelluloses into soluble saccharides (including low molecular weight polymers, oligomers and monosaccharides). The liquid phase containing hemicellulose-derived saccharides was acidified with sulfuric acid and heated up to 130-250°C to obtain furans and levulinic acid as major products. The concentration profiles of the major compounds participating in the reactions were interpreted by a kinetic model. A maximum conversion of pentoses into furfural near 80% was predicted at high temperature and short time, conditions leading to 24% conversion of hexoses into HMF. Production of levulinic acid was favored at low temperatures. Maximum molar conversion of hexoses into levulinic acid (66.7% at 130°C) needed a long reaction time (235 h). A value of 53.0% can be achieved at 170°C after 5 h.
authors.affiliation: Chemical Engineering Department, University of Vigo, Polytechnical Building (Campus Ourense), As Lagoas, 32004 Ourense, Spain; CITI-University of Vigo, Tecnopole, San Cibrao das Viñas, 32901 Ourense, Spain.
authors.forename: Sandra
authors.initials: S
authors.lastname: Rivas
authors.affiliation: Chemical Engineering Department, University of Vigo, Polytechnical Building (Campus Ourense), As Lagoas, 32004 Ourense, Spain; CITI-University of Vigo, Tecnopole, San Cibrao das Viñas, 32901 Ourense, Spain.
authors.forename: María Jesús
authors.initials: MJ
authors.lastname: González-Muñoz
authors.affiliation: Chemical Engineering Department, University of Vigo, Polytechnical Building (Campus Ourense), As Lagoas, 32004 Ourense, Spain; CITI-University of Vigo, Tecnopole, San Cibrao das Viñas, 32901 Ourense, Spain. Electronic address: vsantos@uvigo.es.
authors.forename: Valentín
authors.initials: V
authors.lastname: Santos
authors.affiliation: Chemical Engineering Department, University of Vigo, Polytechnical Building (Campus Ourense), As Lagoas, 32004 Ourense, Spain; CITI-University of Vigo, Tecnopole, San Cibrao das Viñas, 32901 Ourense, Spain.
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Parajó
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D005662:Furaldehyde / Q000031:analogs & derivatives / Q000032:analysis; D006601:Hexoses / Q000032:analysis; D006868:Hydrolysis; D007700:Kinetics; D007982:Levulinic Acids / Q000032:analysis; D008962:Models, Theoretical; D009844:Oligosaccharides / Q000737:chemistry*; D028223:Pinus / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry*; D013696:Temperature; D014934:Wood / Q000737:chemistry*
chemical_list: D006601:Hexoses; D007982:Levulinic Acids; D009844:Oligosaccharides; D011134:Polysaccharides; D013464:Sulfuric Acids; C008046:5-hydroxymethylfurfural; C007916:hemicellulose; D005662:Furaldehyde; C033158:sulfuric acid; D019342:Acetic Acid; C032246:levulinic acid
keywords: Furans; High-temperature reaction; Kinetics; Levulinic acid; Pinus pinaster wood