Phase Equilibria in the Liquid Ternary System [Y(NO_(3))_(3)(TBP)_(3)]-[UO_(2)(NO_(3))_(2)(TBP)_(2)]-C_(14)H_(30) at Different Temperatures

摘要

The phase diagrams of the ternary system [Y(NO_(3))_(3)(TBP)_(3)]-[UO_(2)(NO_(3))_(2)(TBP)_(2)]-tetradecane in the temperature range 298.15-333.15 K were constructed. These diagrams contain the field of homogeneous solutions and the field of separation into two liquid phases (I, II). Phase I is enriched in [Y(NO_(3))_(3)(TBP)_(3)] and [UO_(2)(NO_(3))_(2)(TBP)_(2)], and phase II is enriched in tetradecane. With increasing temperature, the two-phase fields contract. The critical points of the ternary liquid systems depend on temperature. In the two-phase systems, [UO_(2)(NO_(3))_(2)(TBP)_(2)] is preferentially distributed in phase I, although the binary system [UO_(2)(NO_(3))_(2)(TBP)_(2)]-tetradecane is homogeneous over the entire temperature range.