期刊
CELLULOSE
卷 27, 期 16, 页码 9653-9661出版社
SPRINGER
DOI: 10.1007/s10570-020-03423-z
关键词
Dissolving pulp; Cellulose; Ionic liquid (IL); EmimAc; Hemicellulose removal; Fiber swelling; Cellulose crystallinity
资金
- Canada Research Chair's Program of the Government of Canada [231308]
- National Key Research and Development Program of China [2017YFB0307900]
- National Natural Science Foundation of China [31700510, 31700507]
- Chinese Scholarship Council [201908610074]
In this paper hemicellulose was separated by using 1-ethyl-3-methylimidazolium acetate (EmimAc, an ionic liquid) -water mixtures from a paper grade market bleached hardwood kraft pulp to produce dissolving pulp. Pure EmimAc dissolves pulp fibers completely in 30 min at ambient temperatures. By adding water (as an antisolvent to EmimAc system) the cellulose dissolution decreases and by optimizing the conditions, hemicellulose is largely removed while cellulose remains as the solid residue (dissolving pulp). At optimal conditions: molar ratio of water to EmimAc of 2, 60 degrees C, an alpha-cellulose content of 92.2%, with a high yield (78 wt%) was obtained. The viscosity of the solvent mixture decreases by increasing water to EmimAc molar ratio, which improves the mobility of ions, thus, facilitating their penetration into pores and lumens of the fibers during the dissolution process. Cellulose purity increases and purified cellulose yield decreases with the increases in temperature and water content (up to 2 wt%) in the mixture. This study implies that the optimal EmimAc/water mixture is an effective system to separate hemicellulose from hemicellulose/cellulose matrix.
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