(610b) Experimental and Theoretical Study of Lignin Extraction by Ionic Liquids From Straw
AIChE Annual Meeting
2011
2011 Annual Meeting
International Congress on Energy 2011
Separation Processes In Biorefineries II: Ionic Liquids, Reactive Separations and Other Novel Processes
Wednesday, October 19, 2011 - 3:35pm to 3:55pm
Lignin is a natural polymer and it can be the source of aromatic compounds. However, efficient means of seperating lignin from straw is still a problem needed to solve. In this work, dissolution experiments were carried out. Three ionic liquids with the same cation [emim]ClA[emim]OAcA[emim]MeSO4 were selected and sythesised , in order to dissolve lignin from straw with the optimal conditions respectively. The lignin was regenerated by precipitation, then the exteraction yields of the above liquids were obtained, so we can get the order of lignin solubility for varying anoins. Microscopically, the interaction between ionic liquids and lignin was also studied by quantum chemical calculations. Thus, the relationship between exteraction yield and interaction energy was revealed. It also indicates that the solubility of lignin in ionic liquid was mainly influenced by the anions part of ionic liquids.