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采用自制的相平衡研究装置,测定了Rb2CO3-PEG-H2O三元体系在25,35,45℃3个温度及 PEG1000,4000,10000 3个分子量下的等温平衡溶解度.用四参数方程w1=a+bw20.5+cw2+dw22对体系的双液线进行了拟合,拟合结果较好.结果表明该体系的双液相区,随着体系温度的升高和聚乙二醇分子量的增加而增大.用Othmer-Tobias方程和Bancroft方程对体系结线的实验数据进行了关联,并给出了方程的参数,所有线性相关系数(R)均大于0.99;并用NRTL模型对其进行了拟合.论文给出的Rb2CO3-PEG-H2O三元体系的相平衡数据,不仅为溶液化学提供了基础热力学数据,而且为碳酸铷的分离纯化及生物物质的萃取提供了新的方法和依据.

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