Fast pyrolysis of enzymatic/mild acidolysis lignin from moso bamboo

Abstract

The characteristics of enzymatic/mild acidolysis lignin (EMAL) isolated from moso bamboo were investigated using pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Pyrolysis temperature as a factor on products was studied, and the pyrolysis mechanism was inferred with respect to the dominating products. Research results showed that pyrolysis products derived from EMAL pyrolysis were mainly heter°Cyclic (2,3-dihydrobenzofuran), phenols, esters, and a minor amount of acetic acid. Pyrolysis temperature had a distinct impact on yields of pyrolysis products. As pyrolysis temperature increased, the yield of 2,3-dihydrobenzofuran rapidly decreased; however, yields of phenols increased smoothly. It can be obtained that, at the low temperatures (250-400°C), pyrolysis products were mainly 2,3-dihydrobenzofuran, and the highest yield was 66.26% at 320°C; at the high temperatures (400-800°C), pyrolysis products were mainly phenols, and yields hit their highest level of 56.43% at 600 °C. A minor amount of acetic acid only emerged at 800°C. Knowledge of pyrolysis products releasing from EMAL and the pyrolysis mechanism could be basic and essential to the understanding of therm°Chemical conversion of EMAL to chemicals or high-grade energy.