Abstract
Sugarcane leaves straw (SLS) consists of 30.79% hemicelluloses, 40.84% cellulose and 25.80% lignin on dry solid basis and has the potential to serve as a lost cost feedstock for production of value-added products such as ethanol, xylitol, organic acids etc. by microbial fermentation based processes. This work evaluated the hydrolysis of SLS under different conditions using dilute sulfuric acid in order to obtain a xylose-rich hydrolyzate. Acid hydrolysis experiments were performed according to an experimental design considering the following factors: time, temperature, concentration of the acid solution and solid: liquid ratio. The optimum conditions found were 130°C and concentration of sulfuric acid solution of 2.9% w/v, solid: liquid ratio (1:4) and 30 min of residence time. These optimal conditions allowed obtaining a hydrolysate with xylose concentration of 56.5 g/l, corresponding to the recovery of 85.1% from the hemicellulosic fraction of SLS. Analysis of variance was performed for screening of the design experimental matrix. It was observed that only the factors of the acid solution concentration and temperature were significant at 95% confidence.
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