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Title
Pyrolysis of lignin - a potential method for obtaining chemicals and/or fuels
Authors
Mihai Brebu Georgeta Cazacu and Oana Chirila
Received
November 24, 2010
Published
Volume 45 Issue 1-2 January-February
Keywords
lignin, biomass, TG-FTIR/MSD, pyrolysis, chemicals, fuels
Abstract
The paper shows some results on thermal degradation of aspen lignin, lignosulfonate and cellolignin, obtained from TG-FTIR/MSD analysis and from pyrolysis, followed by GC-MSD analysis of the liquid products. The thermal behaviour (temperature range and decomposition stages) depends on the lignin type. Degradation of aspen lignin starts above 200 °C, with the formation of acetic acid, methanol and methylacetate, at a maximum rate around 340 °C, and of phenol derivatives, at 250-450 °C. Ammonia and sulfur dioxide are formed around 250 °C from lignosulfonate, followed by derivatives of the structural compounds in lignin. Some nitrogen- and sulfur-containing compounds were found in the light fraction of pyrolysis oils from the lignosulfonate. Cellolignin, a solid fraction resulting from the vegetable materials during furfural manufacturing, decomposes at a fast rate within a narrow temperature range, the formation of particular compounds being difficult to distinguish. However, furfural and its derivatives were found in degradation products of cellolignin, but not in the other lignins studied.
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