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TitleOptical and chemical characterization of solid residues obtained from vacuum pyrolysis of wood (aspen poplar)
AuthorKalkreuth, W; Brouillard, D; Roy, C
SourceBiomass vol. 10, 1986 p. 27-45,
Alt SeriesGeological Survey of Canada, Contribution Series 35286
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
Subjectsfossil fuels; geochemistry; pyrolysis; organic materials; petrographic analyses; reflectance; vitrinite reflectance
AbstractLaboratory scale vacuum pyrolysis experiments on the thermal conversion of wood (aspen poplar) are reported. The conversion of wood into gaseous and liquid products was found to be almost complete at 400°C where the pyrolytic oil yield was 62% by weight, with 83% of wood being converted. The major pyrolytic reaction zone was between 225 and 300°C. Solid residues obtained from these experiments were characterized by methods of incident light microscopy and elemental analysis. The wood was transformed into vitrinite-like substances which resemble morphologically cell-tissues commonly encountered in the petrographic analysis of peats and coals. Fluorescence and reflectance measurements obtained from the residual materials indicate severe alterations within the organic material leading at elevated temperatures to reflectance values which correspond to the semi-anthracite rank level of coals. The increase of reflectance as reaction temperature increases correlates well with increasing carbon content and a decrease in the H/C-O/C-atomic ratios of the residual materials. There was a good correlation between calorific values determined on the residues and optimal parameters such as lamda max, Q and random reflectance. Results suggest that vacuum pyrolysis has potential as a method for production of liquid products from biomass.

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