Depolymerization of Rice Straw Lignin into Value-Added Chemicals in Sub-Supercritical Ethanol

Figure 4

FTIR spectra of rice straw lignin (a) and char/or solid residue from the lignin depolymerization under the ethanol concentration of (b) water, (c) 50%, and (d) 100% at 275°C, 30 min, 75 : 1 (mL ethanol: 1 g lignin).