Liquid-liquid equilibrium (LLE) data were measured for the aqueous mixtures of phosphoric acid with 1-pentanol and 1-heptanol at T = (298.2, 308.2, and 318.2) K and atmospheric pressure. These ternary systems exhibit as Treybal's type-1 liquid-liquid phase behavior. The reliability of the experimental tie-lines was checked using the Othmer-Tobias and Hand correlation equations. The activity coefficient models of NRTL and UNIQUAC were applied to fit the experimental tie lines. For these models, values of the binary interaction parameters between each pair of components in the studied systems were obtained. Experimental distribution coefficients and selectivity factors for the immiscibility regions were determined.

在T  =（298.2、308.2和318.2）K和大气压下，测量了磷酸与1-戊醇和1-庚醇的水性混合物的液-液平衡（LLE）数据。这些三元系统表现为Treybal的1型液-液相行为。实验连接线的可靠性使用Othmer-Tobias和Hand相关方程式进行了检验。应用NRTL和UNIQUAC的活度系数模型拟合实验联系线。对于这些模型，获得了所研究系统中每对组件之间的二元相互作用参数值。确定了不混溶区域的实验分布系数和选择性因子。