RbBr-PEG（600）-H2O三元体系在多温下的相平衡研究

采用自制的半微量相平衡装置，测定了RbBr-PEG（600）-H2O三元体系在25℃、30℃和35℃下的等温平衡溶解度，同时测定了不同PEG含量下溶液的密度和折光率．结果表明：该体系在所研究的温度下均没有出现分层现象，RbBr的溶解度随温度的升高而增加，在同一温度下RbBr的溶解度随聚乙二醇含量的增加呈单调下降趋势．用四参数方程对溶解度进行了拟合．

Study on the Phase Equilibrium of Ternary System RbBr-PEG(600)-H2O at Different Temperatures

The data of solubilities of rubidium bromide in the system PEG（600）-H2O were measured by using a semimicro installation with an accurate analytical method at 25℃, 30℃ and 35℃ with mass fractions of PEG（600） in the range of 0 to 1.0. Density and refractive index were also determined for the same ternary system with varied PEG（600） concentrations. In all cases, the presence of PEG（600） significantly reduced the solubility of rubidium bromide in aqueous solution, and the ternary system did not have two liquid phases. The solubilities of rubidium bromide in the system increased with the temperature increasing. The solubilities of rubidium bromide in the system decreased with the mass fractions of PEG（600） decreasing at the same temperature. The solubilities of the saturated solutions were fitted via polynomial equations as a function of the mass fraction of PEG（600）.