Thermochemical conversion When heating lignocellulosic materials, even to relatively low temperatures (>100 °C), various chemical changes start to take place.1-5 The thermochemical or thermal conversion of lignocellulosic materials always results in three groups of substances:2,5 gases, condensable liquids (tars) and solid char products (in the case of wood, charcoal) (Figure 1). The relative proportions of
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