Hydrolysis of Cellulose in Hot-Compressed Water under Continuous-Flow Reaction Conditions
A series of experiments were carried out to investigate the effects of reaction conditions on cellulose conversion in hot-compressed water using a continuous flow system. The results show that cellulose in the reactor can be completely hydrolysed with 16-min flow of hot-compressed water at 280 oC and 20 MPa. The conversion and rate of hydrolysis increase significantly with reaction temperature but pressure appears to have insignificant effect for the pressure range which experiments were carried out in this study. The fast reaction rate at high temperature seems to be largely attributed to the thermal cleavage of cellulose to oligosaccharides and their dissolution in hot-compressed water. The liquid samples were clear but white substance precipitated from the liquid samples after settling for 48 h at room temperature. The formation of precipitates seems related to the specific reactivity of cellulose residue during hot-compressed water treatment. It is also found that the precipitate yield increases greatly with reaction temperature, but only slightly increases with pressure. XRD and SEM analysis of the precipitates indicate that the precipitates have recrystallized t℃ellulose II after drying.
cellulose hydrolysis hot-compressed water precipitate.
YUN YU HONGWEI WU
Department of Chemical Engineering, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）