Thermodynamics of 1,3-Dimethylurea in Eight Alcohols

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• 作者：Peipei Zhu ; Yanxin Chen ; Yanan Zhou ; Yan Xiao ; Jinbo Ouyang ; Xin Huang ; Gaohong He ; Baohong Hou ; Wei Chen
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2016
• 出版时间：April 14, 2016
• 年：2016
• 卷：61
• 期：4
• 页码：1517-1523
• 全文大小：330K
• 年卷期：0
• ISSN：1520-5134

文摘

In this work, solubility data of 1,3-dimethylurea (DMU) in methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, and 1-octanol were measured by synthetic method from T = 288.15 to 328.15 K at ordinary pressure. It turned out that the solubility data increased as temperature and solvent polarity increased. The molecular interactions in solution have been studied by the linear energy relationship. Furthermore, based on two thermodynamic models (i.e., modified Apelblat and Wilson), the experimental results were fitted and analyzed. Finally, the thermodynamic properties of solution, including entropy, enthalpy, and Gibbs energy were calculated. These results indicate that in all selected solvents the dissolution behavior were endothermic, entropy-driven, and not spontaneous.