Characterization of the water-insoluble fraction from pyrolysis oil (pyrolytic lignin). Part I. PY-GC/MS, FTIR, and functional groups

Pyrolytic lignins have been obtained from pyrolysis oil as fine homogeneous powder by a novel precipitation method. The paper presents results obtaine d for various pyrolytic lignins of pyrolysis oils from different fast pyrol ysis processes. They were subjected to various physico-chemical characteriz ation methods. Analysis methods comprise chromatography, spectroscopy and w et chemical techniques. FTIR data indicate that a changing oxygen content m ainly effects the intensity of carbonyl absorption bands. Therefore, FTIR a nalysis is valuable as a fast analytical method to elucidate aging processe s of pyrolysis oil. Analytical pyrolysis combined with GC/MS, FTIR data, an d results of functional group analysis show pyrolytic lignin to be similar to technical lignins. (C) 2001 Elsevier Science B.V. All rights reserved.