Phase separation in the (R4N)2[Nd(NO3)5]-hydrocarbon solvent-chloroform systems at various temperatures

Abstract

Phase diagrams were studied for (R4N)2[Nd(NO3)5]-CnH2n + 2-chloroform liquid ternaries (where R4N+ is trialkylbenzylammonium and n = 10, 12, 14, or 15) at T = 298.15−333.15 K. (R4N)2[Nd(NO3)5]-CnH2n + 2 binaries are two-phase liquid systems at all temperatures in this range. One phase (phase I) is an almost pure hydrocarbon solvent. The other (phase II) is enriched in (R4N)2[Nd(NO3)5]. The CnH2n + 2 solubility in phase II decreases with increasing the alkyl chain length of the hydrocarbon solvent and increases with increasing temperature. The title liquid ternaries are characterized by a homogeneous solution field and a two-phase liquid solution field. One phase is enriched in (R4N)2[Nd(NO3)5] and chloroform; the other is enriched in the hydrocarbon solvent. Liquid-liquid phase separation fields enlarge with increasing CnH2n + 2 alkyl chain length and slightly narrow with increasing temperature. Critical solution points at fixed temperatures depend on CnH2n + 2.