The thermodynamics study on the dissolution mechanism of cellobiose in NaOH/urea aqueous solution
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NaOH/urea aqueous solution is a novel, green solvent for cellulose. To explain why cellulose just be dissolved in this solvent under −13 °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.
KeywordsSolution enthalpy Cellobiose Urea solution NaOH/urea aqueous solution
This study was supported by the National Basic Research Program of China (973 Program, 2010CB732203).
- 31.Cai J. Dissolution of cellulose in alkali hydroxide/urea aqueous systems, structure and properties of new materials based on them. Doctor degree thesis, Wuhan University. 2006.Google Scholar
- 34.Wang CX, Song ZH, Xiong WG, Qu SS. Development of an isoperibol reaction calorimeter. Acta Phys Chim Sinica. 1991;7:586–8.Google Scholar
- 35.Cox JD. Recommended reference materials for the realization of physicochemical properties. Pure Appl Chem. 1974;40:399.Google Scholar