Comparative Study of Effective Pretreatments on the Structural Disruption and Hydrodepolymerization of Rice Straw

Rice straw (RS) is the most potentially renewable agricultural waste resource widely distributed in nature. Considering complex recalcitrant structure and components of RS, three pretreatment methods, including high-temperature hydrothermal, medium-temperature microwave, low-temperature cryocrushing were performed. The RS residues examined analyzed after pretreatments. Pretreatment with hydrothermal yielded lowest rice recovery (59.0%); being pretreated at 180 °C for 10 min, hemicellulose was only 14.1%, removal efficiency lignin largest (32.2%), which 18.8% higher than that achieved from microwave pretreatment, respectively. highest rates (92.9%), cellulose (88.8% 90.4%, respectively). Results scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, analysis specific surface area apertures demonstrated all pretreatments could effectively disrupt reduce its crystallinity. found to enhance hydrodepolymerization residues. Furthermore, conversion rate (56.8%), yields glucose, xylose, arabinose 29.6%, 56.2%, 17.8%, Apart use acids enzymes, among few methods can degrade cellulose, presenting an ideal solution degradation biomass.