A novel ternary combination of deep eutectic solvent-alcohol (DES-OL) system for synergistic and efficient delignification of biomass. (October 2018)

• Record Type: Journal Article
• Authors: Kandanelli, Ramesh; Thulluri, Chiranjeevi; Mangala, Ramkumar; Rao, Peddy V.C.; Gandham, Sriganesh; Velankar, Harshad R.
• Is Part Of: Bioresource technology. Volume 265(2018)
• Page Start: 573
• Page End: 576
• Publication Date: 2018-10
• Subjects: DES-OL -- Pretreatment -- Lignocellulosic biomass -- Delignification; 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.2018.06.002
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: A novel ternary system based on a combination of deep eutectic solvent and an alcohol was used for effective pretreatment of lignocellulosic biomass and lignin fractionation. Highlights: A novel green ternary solvent system for delignification of lignocellulosic biomass. Pretreatment was performed for three different biomass materials. About 50% of lignin removal was achieved under mild treatment conditions. Structural changes and lignin recovery were validated by microscopy (Optical & FE-SEM) and CPMAS NMR, respectively. Abstract: A novel ternary system consisting of deep eutectic solvent-alcohol (DES-OL) mixture was developed for the effective delignification of lignocellulosic biomass. Optimization studies included selecting suitable co-solvent (among n -BuOH, n -PrOH & EtOAc) for treating biomass (rice husk, rice straw and wheat straw), altering the DES-to-alcohol ratio (2:1, 1:1 and 1:2) as well as the reaction temperature (50, 80 and 120 °C). The highest delignification (∼50%) was observed using n -butanol assisted DES (ChCl: OA) at a ratio of 2:1, with high solid loading of 15% ( w/v ) at 120 °C (∼1.2 bar) in a 60 min reaction. Post pretreatment, high purity lignin was recovered after distilling off butanol for recycling. Microscopy and CPMAS/NMR studies confirmed the effectiveness of DES-OL pretreatment on biomass delignification.