title: Exploitation of hemicellulose, cellulose and lignin from Hesperaloe funifera.
abstract: This work seeks the integral use of all major components of Hesperaloe funifera, separating hemicelluose by hydrothermal treatments; cellulose by pulping processes; and exploitation of lignin of pulping liquor by pyrolysis and gasification processes. By using sulfuric acid in the hydrothermal treatment (150-190 °C, 0-20 min after reaching operating temperature, 6-10 liquid/solid ratio, 0.1-0.5% sulfuric acid), the glucose and xylose of liquid fraction increase from 1.5% to 5.9%, and 4.0% to 12.4%, respectively; the yields of solid fraction decrease from 91.6% to 79.5%, and the lignin content increase from 23% to 32%. Pulps and paper sheets obtained from solid fractions hydrothermal treatments and from raw material pulped with diethanolamine, are worse than those obtained with soda-anthraquinone (Yield 57.8%; kappa number 24.9; Viscosity 711 mL/g; Brightness 54.8%; Tensile index 73.6 Nm/g; Stretch 2.84%; Burst index 6.13 kN/g and Tear index 1.69 mNm2/g). By acidification (pH 6) of soda pulping liquor it separate lignin-rich solids, which by pyrolysis gave a gas containing 1.13% H2, 31.79% CO and 1.86% CH4 by weight. Gasification of the same sample provided a gas containing 0.18% H2, 24.50% CO and 17.75% CH4.
authors.affiliation: Chemical Engineering Department, University of Córdoba, Córdoba, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Sánchez
authors.forename: A
authors.initials: A
authors.lastname: Rodríguez
authors.forename: J C
authors.initials: JC
authors.lastname: García
authors.forename: A
authors.initials: A
authors.lastname: Rosal
authors.forename: L
authors.initials: L
authors.lastname: Jiménez
mesh_terms: D000070357:Asparagaceae / Q000737:chemistry*; D001272:Atmosphere; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry*; D008031:Lignin / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D010209:Paper; D011134:Polysaccharides / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry; D013696:Temperature; D014867:Water / Q000737:chemistry
chemical_list: D011134:Polysaccharides; D013464:Sulfuric Acids; D014867:Water; C007916:hemicellulose; D002482:Cellulose; D008031:Lignin; C033158:sulfuric acid; D010100:Oxygen