Preparation of convertible cellulose from rice straw using combined organosolv fractionation and alkaline bleaching

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Luo, Kehui^1 ; Wang, Yuexin^1 ; Xiao, Huzong^1 ; Song, Guangsen^1 ; Cheng, Qunpeng^1 ; Fan, Guozhi^1

School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei

430023, China^1

关键词: Cellulose content;    Microcrystalline cellulose;    Mixed solution;    Mixed solvent;    Organosolv fractionations;    Removal rate;    Rice straws;    X ray diffractometers;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/5/052053/pdf
DOI  :  10.1088/1755-1315/237/5/052053

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Rice straw was employed to prepare microcrystalline cellulose (MCC). First, crude cellulose was isolated from rice straw using organosolv fractionation in the presence of mixed solvent composed of ethanol and H2O. Most hemicellulose and lignin were removed while little silica was not. Second, crude cellulose was bleached in Na2CO3/H2O2 mixed solution to remove residual silica as well as small amount of hemicellulose and lignin. After that, the removal rates of hemicellulose, lignin and silica reached up 91.5, 92.8 and 97.9%, respectively. Cellulose from rice straw was further converted into MCC in the presence of hydrochloric acid aqueous solution, and the cellulose content reached up to 92.4% in MCC. Infrared spectrometer (IR) and X-ray diffractometer (XRD) were used to characterize the structure of rice straw and its derived samples.