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Vacuum pyrolysis of wood yields approximately 50% by weight of oils, 23% charcoal, 16% pyrolytic water and 11% gas. This oil typically contains 5-10% organic acids, 5-10% sugars, 10-25% oxygenated aromatic compounds with moderate to high polarity and 30-45% high polar and partially polymeric compounds. The process economics greatly improve if the valuable chemicals which are found in this oil can be extracted and sold as by-products together with the fuel oil and charcoal. Preliminary laboratory analytical results showed that wood pyrolysis oils contain various valuable rare and commodity chemicals depending on the wood source material. Hardwood, for example, yielded …
