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

页码：891 / 896

页数：6

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