abstract
This work evaluated the effectiveness of ternary deep eutectic solvents (DES) composed of cholinium chloride (ChCl), lactic acid (LA) and a diol (ethylene glycol - EG, or 1,6-hexanediol - HEX) in the pretreatment of rice straw (RS) towards the production of biobutanol. The most promising results were obtained with ChCl:LA:EG 1:5:5 at 120 degrees C for 4 h, which enabled the highest conversion of biomass polysaccharides into glucose and xylose up to 89.3 % and 53.6 % yields, respectively. Subsequently, the produced sugars were efficiently converted into biobutanol through the acetone-butanol-ethanol (ABE) fermentation process, resulting in the production of 95.7 g butanol/kg RS as one of the highest values reported in literature. Thus, the application of the ternary DES ChCl: LA:EG 1:5:5 represents a competitive and environmentally friendly pathway for RS valorization in comparison to conventional processes.
keywords
RICE STRAW; ENZYMATIC-HYDROLYSIS; PRETREATMENT; LIGNIN; EXTRACTION; ACID
subject category
Science & Technology - Other Topics; Energy & Fuels
authors
Poy, H; Lopes, AMD; Lladosa, E; Gabaldón, C; Loras, S; Silvestre, AJD
our authors
André M. da Costa Lopes
External Researcher
Armando Jorge Domingues Silvestre
Full professorProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
Financial support was obtained from Ministerio de Ciencia e Innovacion (MCIN) (Grant PID2021-122454OB-I00 funded by MCIN/AEI/10.13039/501100011033 and by "ERDF A way of making Europe") and from Conselleria d'Innovacio, Universitats, Ciencia i Societat Digital (Project AICO/2021/121, Generalitat Valenciana) . H. Poy acknowledges to the Ministerio de Educacion y Ciencia (Spain) for her PhD fellowship (FPU18/02817) and to Ministerio de Universidades (Spain) for the research stay grant (EST21/00403) . The project CICECO-Aveiro Institute of Materials (UIDB/50011/2020, UIDP/50011/2020 and LA/P/0006/2020) , financed by national funds through the FCT/MEC (PIDDAC) are also acknowledged. AndreM.da Costa Lopes acknowledges his research contract funded by the Fundacao para a Ciencia e Tecnologia (FCT) and project CENTRO-04-3559-FSE-000095-Centro Portugal Regional Operational Programme (Centro2020) , under the PORTUGAL 2020 Partnership Agreement, through the European Regional Development Fund (ERDF) .