Isolation of highly purity cellulose from wheat straw using a modified aqueous biphasic system  

作　　者：Lifeng YAN Yi ZHAO Qing GU Wan LI 

机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics,University of Science and Technology of China,Hefei 230026,China

出　　处：《Frontiers of Chemical Science and Engineering》2012年第3期282-291,共10页化学科学与工程前沿（英文版）

基　　金：Acknowledgements This work was supported by the National Natural Science Foundation of China （Grant No. 51073147） and the National Basic Research Program of China （Grant Nos. 2010CB923302 and 2011CB 921403）.

摘　　要：Cellulose samples with molecular weights ranging from 8.39 × 10^4 to 11.00 × 10^4g/mol were obtained from wheat straw. The dewaxed wheat straw was pretreated with aqueous hydrochloric acid followed by delignification using an environmentally benign poly （ethyleneglycol）/salt aqueous biphasic system. The yield of cellulose was in the range of 48.9% 55.5% and the cellulose contained 1.2%-3.2% hemicelluloses, and 0.97%-3.47% lignin. All the isolated cellulose samples could be directly dissolved in a 6 wt-% NaOH/4 wt-% urea aqueous solution through a precooling-thawing process to form a homogenous solution. The separation process was investigated and the obtained cellulose and its solution were characterized by Fourier transform infrared spectro- scopy, scanning electron microscopy and energy dispersive X-ray apparatus, and X-ray diffraction. The results revealed that aqueous soluble cellulose can be directly prepared from wheat straw by this method and this study opens a novel pathway to prepare cellulosic materials from agricultural waste.Cellulose samples with molecular weights ranging from 8.39 × 10^4 to 11.00 × 10^4g/mol were obtained from wheat straw. The dewaxed wheat straw was pretreated with aqueous hydrochloric acid followed by delignification using an environmentally benign poly （ethyleneglycol）/salt aqueous biphasic system. The yield of cellulose was in the range of 48.9% 55.5% and the cellulose contained 1.2%-3.2% hemicelluloses, and 0.97%-3.47% lignin. All the isolated cellulose samples could be directly dissolved in a 6 wt-% NaOH/4 wt-% urea aqueous solution through a precooling-thawing process to form a homogenous solution. The separation process was investigated and the obtained cellulose and its solution were characterized by Fourier transform infrared spectro- scopy, scanning electron microscopy and energy dispersive X-ray apparatus, and X-ray diffraction. The results revealed that aqueous soluble cellulose can be directly prepared from wheat straw by this method and this study opens a novel pathway to prepare cellulosic materials from agricultural waste.

关 键 词：CELLULOSE STRAW separation aqueous solution 

分 类 号：TQ341.1[化学工程—化纤工业] S141.4[农业科学—肥料学]