A NEW PRETREATMENT METHOD FOR THERMO-CHEMICAL CONVERSION OF BIOMASS

摘要

A new pretreatment method for completely separating biomass components was presented. The method consists of a hot water treatment and water/acetone extraction. The optimum extraction temperatures are 180℃ and 230℃ for a hot water treatment and a water/acetone extraction, respectively. Figure 4 summarizes the pretreatment process newly proposed. Compared to the process former proposed, the amount of the CO_2 emission at the stage of delignification decreased considerably due to being free from the oxidative decomposition Furthermore the newly proposed process has the advantage of recovery of the solvent. Thus the proposed pretreatment process was found to realize a mild separation of biomass into main three components. One of the suitable conversion methods of the water-soluble components is judged to be a hydrothermal catalytic gasification, and the formation of fuel gases such as H_2, H_4 by the method has already been confirmed.