Organosolv processing of vine shoots: Fractionation and conversion of hemicellulosic sugars into platform chemicals by microwave irradiation. (December 2021)

• Record Type: Journal Article
• Authors: Rivas, S.; López, L.; Vila, C.; Parajó, J.C.
• Is Part Of: Bioresource technology. Volume 342(2021)
• Publication Date: 2021-12
• Subjects: Vine shoots -- Fractionation -- Lignin -- Microwave heating -- Furfural; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.125967
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Cellulose, hemicelluloses and lignin were separated in a single reaction. Water/1-butanol/catalyst media were employed for vine shoot fractionation. Optimal conditions for lignin and cellulose recovery were identified. The recoverd lignin showed 85% purity, and the solid contained 75% cellulose. Furans were produced from the aqueous phase obtained in fractionation. Abstract: Vine shoots were subjected to a mild aqueous extraction (to remove water-soluble extractives), and the extracted solids were reacted in catalyzed media (containing water and 1-butanol) to achieve the one-stage solubilization of lignin and hemicelluloses, yielding a cellulose-rich solid. Operating in a microwave-heated reactor under optimized conditions (190 °C in media containing 2% of catalyst and 52% 1-butanol), 67.8% lignin was dissolved, and solids containing 75% cellulose were obtained. Lignin was recovered from the reaction medium and characterized, whereas the hemicellulose-derived products present in the aqueous phase (obtained under conditions leading to maximum concentrations of 17.7 g pentoses/L) were converted into furfural at 64.6% molar yield by acidic processing in the presence of recycled 1-butanol.