Hydrolysis characteristics of sugarcane bagasse pretreated by dilute acid solution in a microwave irradiation environment

Pretreatment of lignocellulosic biomass is of the utmost importance for the development of bioethanol because of the abundance and low cost of lignocelluloses. To figure out the hydrolysis characteristics of sugarcane bagasse in a microwave irradiation environment, the biomass is pretreated by a dilute sulfuric acid solution at 180 °C for 30 min, with the concentration ranging from 0 to 0.02 M. A variety of analyses, including fiber analysis, TGA, XRD, FTIR and HPLC, are employed to aid in understanding the physical and chemical characteristics of residual solid particles and solutions. A higher concentration is conducive to destroying bagasse; however, the buffering capacity possessed by the biomass is also observed in the pretreatment. The experimental results indicate that around 40–44 wt% of bagasse is degraded from the pretreatment in which around 80–98% of hemicellulose is hydrolyzed. In contrast, crystalline cellulose and lignin are hardly affected by the pretreatment. The maximum yields of xylose and glucose as well as the minimum furfural selectivity occur at the acid concentration of 0.005 M. Consequently, the aforementioned concentration is recommended for bagasse pretreatment and bioethanol production.

► Pretreatment of sugarcane bagasse via dilute sulfuric acid is studied.
► The concentration of the dilute sulfuric acid is in the range of 0–0.02 M.
► Around 40–44 wt% of bagasse is degraded from the pretreatment.
► Around 80–98% of hemicellulose in bagasse is hydrolyzed.
► The optimal operation of the pretreatment occurs at 0.005 M.