COMPARISON OF DEGRADABILITY AND DEGRADATION PRODUCTS OBTAINED FROM Populus alba x gradulosa and Pinus rigida WOODS BY FLOW- AND BATCH TYPE SUPERCRITICAL WATER OXIDATION

摘要

In this study, the possibility of sugar conversion of woody biomass and their degradation features of major wood components were characterized using supercritical water (SCW) treatment. The wood meal of poplar {Populus alba x glandulosa) and pitch pine (Pinus rigida) were treated for 30 and 60sec under subcritical (23 MPa, 25℃ and 350℃) and supercritical condition (23 MPa, 380℃, 400℃, and 425℃), respectively. In case of batch type the lignocellulosics were oxidized at 380℃ and 100MPa for 30sec. The degradation rate of woody biomasses was ranged between 75% and 90% during the both SCW treatment systems. The main degradation products were identified to monomeric sugars and furan derivatives from the cellulose/hemicellulose and low molecular phenolic compounds from the lignin. The total yields of monomeric sugars reached up to 6.7% for poplar and 7.3% for pitch pine at the flow type supercritical condition of 425℃, 23MPa for 60sec.