The thermodynamics study on the dissolution mechanism of cellobiose in NaOH/urea aqueous solution

被引：12
|
作者：
Zhao, Xiaojun [1 ]
Chen, Yuting [1 ]
Jiang, Xinwei [1 ]
Shang, Yuhan [1 ]
Zhang, Long [1 ]
Gong, Qing [1 ]
Zhang, Haibo [1 ]
Wang, Zhiyong [1 ]
Zhou, Xiaohai [1 ,2 ]
机构：
[1] Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China
[2] Ankang Univ, Dept Chem & Chem Engn, Ankang, Shanxi, Peoples R China
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2013年 / 111卷 / 01期
关键词：
Solution enthalpy; Cellobiose; Urea solution; NaOH/urea aqueous solution; HYDRATED HYDROXIDE IONS; MOLECULAR-DYNAMICS; LIQUID WATER; TRANSPORT MECHANISM; LOW-TEMPERATURES; UREA SOLUTIONS; HYDROGEN-BOND; CELLULOSE; SOLVATION; FIBERS;
D O I：
10.1007/s10973-012-2217-6
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
NaOH/urea aqueous solution is a novel, green solvent for cellulose. To explain why cellulose just be dissolved in this solvent under -13 A degrees C, we studied and discussed the dissolving process of cellobiose in water, urea solution, NaOH solution and NaOH/urea aqueous solution. Dissolving cellobiose in water and the urea solution absorb heat, which is an entropy-driven process. Dissolving cellobiose in NaOH solution and mixed NaOH/urea solution is exothermic, which is an enthalpy-driven process. OH- plays an important role in the dissolving process by forming a hydrogen-bonding complex. From the thermodynamic point of view, negative entropy can well interpret why cellulose must be dissolved in cold NaOH/urea aqueous solution.
引用
收藏
页码：891 / 896
页数：6
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