Preparation of convertible cellulose from rice straw using combined organosolv fractionation and alkaline bleaching. Issue 5 (February 2019)

• Record Type: Journal Article
• Authors: Luo, Kehui; Wang, Yuexin; Xiao, Huzong; Song, Guangsen; Cheng, Qunpeng; Fan, Guozhi
• Is Part Of: IOP conference series. Volume 237:Issue 5(2019)
• Publication Date: 2019-02
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/237/5/052053
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: 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 H2 O. Most hemicellulose and lignin were removed while little silica was not. Second, crude cellulose was bleached in Na2 CO3 /H2 O2 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.