원문정보
초록
영어
In this study, lignin was isolated by ionic liquid (IL) treatment from lignocellulosic biomass (Quercus mongolica), and the characteristics of the obtained lignin were investigated. The wood powder was loaded in ILs ([EMIM]Ac, [AMIM]Cl, [BMIM]Cl, [HMIM]Cl) to a 15wt% concentration, and then the reaction was conducted at 140 °C for 2h. The reactant was vacuum-filtrated, and the residue was washed using an acetone/distilled water (1/1, v/v) solution. The filtrate was evaporated using an evaporator to remove the acetone in the filtrate. Next, the filtrate was added in distilled water (2L), and then the pH of the filtrate was adjusted to pH 2 using a HCl solution to precipitate IL-isolated lignin (ILL). The yields of ILL in [EMIM]Ac, [AMIM]Cl, [BMIM]Cl and [HMIM]Cl were 5.28%, 1.66%, 1.55%, and 1.52%, respectively. As the reaction temperature in [EMIM]Ac was increased, the yield of ILL and soluble fraction were increased. Molecular weights of ILLs were 4388, 2657, 2260, and 2660(g/mol) for [EMIM]Ac, [AMIM]Cl, [BMIM]Cl and [HMIM]Cl, respectively. The hydroxyl group content of the ILL by [EMIM]Ac was 2.58 mmol/g.