【摘要】 <正> 在萃取化学中,为了研究萃取机理和求得真正的热力学平衡常数,常需引用有机相各组分的活度系数。但是由于实验方法的困难,有关这方面的数据还很不完备。 二(2-乙基己基)磷酸(D2EHPA)是一种重要的萃取剂,它广泛的应用于核燃料提取、稀土元素分离和其他有色金属的水冶工艺中。曾利用蒸气压法初步测定过它在某些溶剂中的活度系数。但蒸气压法实验直接测定的是溶剂的活度系数,如求溶质的活度系数,更多还原

【Abstract】 The activity coefficients f2 of D2EHPA in various solvents (Benzene, Hexane, Carbon tetrachloride, Chloroform) have been determined by 32P-labeled D2EHPA distribution method. In N1 from 0 to 0.9, these activity coefficients may be described by the following equations log f2 = aN12, where N1 is molfraction of solvent. Constant a was obtained by graphical method. The effect of different solvents on the activity coefficients has also been discussed.更多还原