Ethanol-water organosolv delignification of liquid hot water (LHW) pretreated sugarcane bagasse enhanced by high-pressure carbon dioxide (HP-CO2)

Author(s)

Alves Gurgel, Leandro Vinicius ; Borges Pimenta, Maria Teresa ; da Silva Curvelo, Antonio Aprigio

• Document type: Journal article
• Source: INDUSTRIAL CROPS AND PRODUCTS; v. 94, p. 942-950, DEC 30 2016.
• Web of Science Citations: 6

Abstract

Organosolv delignification assisted by high-pressure carbon dioxide (HP-CO2), a low cost, non-corrosive and recoverable compound was evaluated as a potential green pretreatment technology for lignin extraction from liquid hot water (LHW) pretreated sugarcane bagasse to produce fermentable sugars in a lignocellulosic biorefinery concept. In this study, LHW pretreated bagasse (180 degrees C for 20 min with a liquid-to-solid ratio (LSR) of 9 (v/w)) was delignified with an ethanol-water mixture (1:1, v/v) and HP-CO2 as a co-solvent at milder temperatures (111.7-168.3 degrees C) and times (23.8-66.2 min) at a LSR of 5 (v/w). To evaluate the effects of varying operational conditions on the lignin content and delignification extent, while preserving the glucan fraction, a 2(2) central composite design was used as a factorial planning. Solid fractions with low lignin contents (7.35% and 10.78%) and high delignification extents (82.5% and 72.2%) with good glucan preservations (84.6% and 85.3%) were obtained at 140 degrees C for 45 min and 111.7 degrees C for 45 min, respectively. These solid fractions were subjected to enzymatic hydrolysis, yielding enzymatic conversions of 60.8% and 63.7%, respectively. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 07/51755-0 - Development of analytical methodologies and organosolv delignification processes applied to bagasse and straw from sugarcane
• Grantee: Antonio Aprigio da Silva Curvelo
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Research Partnership for Technological Innovation (PITE)