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Abstract
A number of water‐soluble and phenolic tar compounds from eucalyptus sawdust and kraft lignin charring have been identified by flame‐ionization gas‐chromatography and gas‐chromatography‐mass‐spectrometry. Acetic acid and methanol were the prime organic products in the aqueous phase and 2,6‐dimethoxyphenol was the most abundant component of the tarry fraction. Kraft lignin yielded substantially higher amounts of phenolic tars than wood, whereas the opposite can be said in the case of water‐soluble products. The composition of the aqueous fraction makes highly doubtful the recovery of individual components in economically acceptable conditions and leads to consider that fraction as a liquid waste stream in most cases. With regard to the tarry fraction, re‐use in the charring plant as fuel and/or briquetting agent could avoid the important treatment and/or disposal problem created by the presence of a variety of oxygenated aromatic compounds.
Notes
To whom correspondence should be addressed.