title: Delignification of sugarcane bagasse using glycerol-water mixtures to produce pulps for saccharification.
abstract: This paper describes the organosolv delignification of depithed bagasse using glycerol-water mixtures without a catalyst. The experiments were performed using two separate experimental designs. In the first experiment, two temperatures (150 and 190°C), two time periods (60 and 240 min) and two glycerol contents (20% and 80%, v/v) were used. In the second experiment, which was a central composite design, the glycerol content was maintained at 80%, and a range of temperatures (141.7-198.3°C) and time (23-277 min) was used. The best result, obtained with a glycerol content of 80%, a reaction time of 150 min and a temperature of 198.3°C, produced pulps with 54.4% pulp yield, 7.75% residual lignin, 81.4% delignification and 13.7% polyose content. The results showed that high contents of glycerol tend to produce pulps with higher delignification and higher polyoses content in relation to the pulps obtained from low glycerol content reactions. In addition, the proposed method shows potential as a pretreatment for cellulose saccharification.
authors: Grupo de Físico-química orgânica, Departamento de Físico-química, Instituto de Química de São Carlos, Universidade de São Paulo, Av. Trabalhador São Carlense 400, Caixa Postal 780, 13560-970 São Carlos, São Paulo, Brazil.
authors: Lísias Pereira
authors: LP
authors: Novo
authors: Leandro Vinícius Alves
authors: LV
authors: Gurgel
authors: Karen
authors: K
authors: Marabezi
authors: Antonio Aprigio da Silva
authors: AA
authors: Curvelo
mesh_terms: D000704:Analysis of Variance; D001709:Biotechnology / Q000379:methods*; D050260:Carbohydrate Metabolism; D002482:Cellulose / Q000737:chemistry*; D005990:Glycerol / Q000737:chemistry*; D008031:Lignin / Q000737:chemistry*; D008956:Models, Chemical; D010209:Paper; D031786:Saccharum / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D002482:Cellulose; D008031:Lignin; C027433:bagasse; D005990:Glycerol