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 obtained for various pyrolytic lignins of pyrolysis oils from different fast pyrolysis processes. They were subjected to various physico-chemical characterization methods. Analysis methods comprise chromatography, spectroscopy and wet chemical techniques. FTIR data indicate that a changing oxygen content mainly effects the intensity of carbonyl absorption bands. Therefore, FTIR analysis is valuable as a fast analytical method to elucidate aging processes of pyrolysis oil. Analytical pyrolysis combined with GC/MS, FTIR data, and results of functional group analysis show pyrolytic lignin to be similar to technical lignins. (C) 2001 Elsevier Science B.V. All rights reserved.