Aspen Bibliography

Characterization of the Solid Residues of Vacuum Pyrolysis of Populus Tremuloides

Document Type

Article

Journal/Book Title/Conference

Journal of Analytical and Applied Pyrolysis

Volume

14

Issue

4

First Page

281

Last Page

291

Publication Date

2-1989

Abstract

Bulk chemical analyses and surface composition ESCA results are reported for the solid residues of vacuum pyrolysis of Populus tremuloides. The conversions of hemicellulose and lignin start as low as 207°C, but below 280°C the conversion products of lignin are mostly solids. Cellulose is converted to oil and gas above 280°C, but some of these products undergo secondary recondensation reactions which involve lignin degradation solid products. The char obtained above 315°C mostly consists of polyaromatic materials. The ESCA analysis of chars produced from extracted and non-extracted wood indicate the presence of extractives with hydrocarbon chains on the surface of the fibers. These heavy components seem very resistant to thermal degradation and remain on the surface of the residues up to 400°C even under vacuum conditions. The effect of these extractives on the liquefaction of wood is discussed.

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