Comprehensive utilization of the hydrolyzed productions from rice hull

The study based on pretreatment, hydrolyzation and separation processes with the raw material rice hull, provides a comprehensive utilization of the hydrolyzed productions, such as glucose (C6H12O6) from cellulose, silica (SiO2), and byproduct crystalline sodium sulfate (Na2SO4 center dot 10H(2)O). The optimum hydrolysis conditions are as follows: the concentration of H2SO4 is 72% (wt.%), the temperature is 50 degrees C, the ratio of H2SO4 solution volume (mL) to the rice hull mass (g) is 10:1 and the time is 5 min, the glucose yield rate reaches 45.6% (wt.%). The concentration of glucose solution could be 0.1 g/mL after neutralization measured by ultraviolet spectrophotometer (UV-VIS). Silica powder was below 50 nm characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The main byproduct crystalline sodium sulfate was featured by XRD and photographs. (C) 2010 Elsevier B.V. All rights reserved.