“…The common types of ILs that exist are imidazolium, tetra alkylphosphonium, pyridinium, pyrrolidinium and quaternary ammonium (Flieger et al, 2014;Torralba-Calleja et al, 2013;Vancov et al, 2012;Han and Row, 2010). Considered as green solvents, ILs are now being employed for lignocellulosic biomass pre-treatment (Gunny and Arbain, 2013;Yang and Wyman, 2008;Kim et al, 2011;MoraPale et al, 2011;Lee et al, 2014).…”