中文摘要：

离子液体作为一种新的环境友好的溶剂，拥有作为吸收式工质对的优良特性。本文对离子液体[Emim]Br及其水溶液的热力学性质进行了研究，使用DMA-55型精密数字密度计测定了[Emim]Br-水二元混合物在298．15K，308．15K和318．15K三个温度下全浓度范围内的密度数据，关联得出密度与组成和温度的关系式。计算了三个温度下混合物的超额体积，并用六参数Redlich-Kister方程进行关联。

英文摘要：

The ionic liquids have special features used in absorption cycle as alternative absorbents of working fluids. Thermodynamic properties of [Emim]Br and its aqueous solution were studied in this paper. Densities of [Emim]Br ＋ water were measured over the entire range at 298.15 K, 308.15 K and 318.15 K respectively, with an Anton Paar DMA 55 digital densimeter. And the densities data are correlated as a function of composition and temperature. Excess volumes （VE） were calculated and correlated using six-parameter Redlich-Kister equation.