Analytical Pyrolysis Characteristics of Enzymatic/Mild Acidolysis Lignin (EMAL)

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Abstract

Fast pyrolysis is a promising method that is being investigated for application in the degradation of lignin into phenolic chemicals. In this study, enzymatic/mild acidolysis lignin (EMAL) isolated from eucalyptus (E-EMAL) and wheat straw (W-EMAL) were characterized by pyrolysis- gas chromatography/mass spectrometry. The results showed that the compositions and yields of the products were determined by the lignin type and pyrolysis temperature. The identified products from the E-EMAL and W-EMAL pyrolysis mainly included G-phenols such as 2-methoxy-4- vinylphenol and guaiacol, S-phenols such as syringol and 2,6- dimmethoxy-4-(2-propenyl)-phenol, and H-phenols such as phenol, 2- methylphenol, and 4-vinylphenol. The overall yield of these phenolics varied with the investigated conditions. The G- and S-phenols were the primary products during the E-EMAL pyrolysis, while more H-phenols were produced during the W-EMAL pyrolysis. A compromise mild pyrolysis temperature of 450 °C to 650 °C resulted in a high phenolics yield, while a temperature greater than 650 °C led to the production of more aromatic hydrocarbons.

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Li, T., Lyu, G., Saeed, H. A. M., Liu, Y., Wu, Y., Yang, G., & Lucia, L. A. (2018). Analytical Pyrolysis Characteristics of Enzymatic/Mild Acidolysis Lignin (EMAL). BioResources, 13(2), 4484–4496. https://doi.org/10.15376/BIORES.13.2.4484-4496

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