Sequential fractionation of sugarcane bagasse using liquid hot water and formic acid-catalyzed glycerol-based organosolv with solvent recycling

Autor: Takashi Watanabe, Misato Yamada, Hiroshi Nishimura, Verawat Champreda, Marisa Raita, Chayanon Chotirotsukon, Navadol Laosiripojana
Rok vydání: 2020
Předmět:
Zdroj: BioEnergy Research. 14:135-152
ISSN: 1939-1242
1939-1234
DOI: 10.1007/s12155-020-10181-0
Popis: A fractionation scheme for lignocellulosic biomass where major constituent biopolymers are recovered in applicable forms is essential for integrated biorefinery. In this study, a sequential two-step fractionation of sugarcane bagasse using liquid hot water followed an organic acid-catalyzed aqueous glycerol-based organosolv process was developed. Under optimal conditions, 66.1% of the hemicellulose was recovered as saccharides by the acid-catalyzed hydrothermal step. Formic acid was superior to H2SO4 and HNO3 as a catalyst for the subsequent organosolv step using aqueous glycerol in terms of delignification efficiency and selectivity, resulting in a maximum of 78.3% lignin recovery after acetone extraction with > 90% purity and better conservation of aromatic subunit structure according to 2D-NMR. The majority of cellulose (86.4%) was retained as a solid with high purity (74.8%) and enzymatic digestibility, resulting in 78.2% glucose recovery. The formic acid-aqueous glycerol-spent liquor could be recycled for at least four consecutive batches with no significant decrease in product yield or selectivity. The work represents an efficient sequential process for fractionation of lignocellulose-derived components which allowed solvent recycling and recovery of high-purity lignin with conserved subunit structure. The separated product streams are suitable for valorization in biorefinery. Graphical abstract
Databáze: OpenAIRE
Externí odkaz: