| 초록 |
Lignin is the most abundant potential renewable source for aromatic building blocks and other chemicals. However, due to its insoluble nature, it is broken and used as energy source in the industrial processes that use plant polysaccharides. One way of expanding the application of lignin is to change its structure by introducing functional group to increase its solubility in organic solvent or water. In this study, organo-solve lignin and klason lignin were phenolated by the reaction with phenol using sulfuric acid as a catalyst. The highest yield value can be obtained at 100oC for 20 minutes with the weight ratio of lignin and phenol (1:1) and sulfuric acid 15 wt% based on the initial lignin content. In the presence of sulfuric acid, the reaction time and the reaction temperature can be reduced significantly. The phenolated lignin structures were characterized using HSQC NMR and the thermal properties were studied by TGA and DSC. |
