EFFECT OF GLYCEROL PREATREATMENT ON COMPONENTRECOVERY AND ENZYMATIC HYDROLYSISOF SUGARCANE BAGASSE

摘要

Sugarcane bagasse was prctreated with glycerol (40-80% (w/w)) either in the presence of NaOH or H2SO4, or without any chemicals, at 190 °C, 10% biomass load, for 1 to 4 hours. The pretreatments resulted in cellulose-enriched fibres and different degrees of xylan and lignin solubilisation. Cellulose recovery was higher in pretreatments with NaOH addition and without any chemicals, than in those with H2SO4. Xylan solubilization was almost complete in all H2SO4-assisted treatments whereas, in the other experiments, it decreased with the increase in glycerol concentration and increased with the pretreatment time. Lignin solubilisation increased proportionally with glycerol concentration. Under all conditions applied, the pretreatment improved the enzymatic hydrolysis of cellulose. The highest overall cellulose convertibilities were achieved in the glycerol pretreatments without other chemicals (85-94%). Convertibility decreased with time in acidic pretreatments, and increased slightly for the other ones. Enzymatic conversion of the xylan retained in the fibres was also detected.