Hetero-molecular association in binary mixtures of solvent extractants and diluents at temperature 303.15 K

Abstract

Ultrasonic velocity and viscosity measurements have been made for binary liquid mixtures of solvent extractants, LIX reagents such as LIX 84 and LIX 984 in benzene, amyl alcohol and tri-n-butyl phosphate (TBP) at temperature 303.15 K and at atmospheric pressure. The measured values of ultrasonic velocity, density and viscosity have been utilised to compute various thermo-acoustic parameters and their excess functions, which provide information about the nature and strength of intermolecular interactions present in the systems.

Volumetric and acoustic properties of binary mixtures of tri-n-butyl phosphate with n-hexane, cyclohexane, and n-heptane from T=(298.15 to 323.15)K

“…Knowledge of the intermolecular interactions among the diluent and extractant is of primary importance since it is one of the factors which help to design the solvent extraction process with greater efficacy. Although some reports on compressibility and/or density studies in various TBP-diluent systems are present in the literature [10][11][12][13][14][15][16][17], to the best of the knowledge of the authors, both density and compressibility data on TBP + hexane, TBP + cyclohexane, and TBP + heptane are not available. Our aim is provide new experimental data on density and speed of sound and other derived properties of these binary mixtures in the temperature range of T = (298.15 to 323.15) K over the entire composition range and to explore, from density and sound velocity measurements, how the strength and nature of interactions between polar TBP and non-polar alkane molecules change when an additional methylene moiety gets incorporated in the chain or when the conformation changes from open chain to a closed one.…”

Internal Pressure of Liquids and Solutions

“… a The low value depends on an estimated large value of κ T = 1.62 GPa –1 that is not compatible with an appreciably smaller value for κ S = 0.65 GPa –1 , which would lead to P int ≈ 390 MPa, expected from the value for trimethyl phosphate. b Values of ρ, α P , and κ T are from Lide, and that of Δ V H is from Boudala et al …”

Scrutiny of physico‐chemical properties of extractant‐diluent phase: Keystone of extraction systems

“…This is in turn encourages the formation of a greater number of α‐multimers in the system 33 . The wood‐pile and head‐tail arrangement of TBP molecules are represented in Figure 5 34 …”

“…33 The wood-pile and headtail arrangement of TBP molecules are represented in Figure 5. 34 Volumetric and acoustic properties of TBP with nhexane/cyclohexane/n-heptane have been investigated at T = (298.15-323.15 K). Due to the presence of polar interactions in pure TBP molecules, the interaction between TBP and hydrocarbon is less favorable as represented in Figure 5.…”