Study on volumetric and acoustic properties of binary mixtures of p-Cymene with fluorobenzene, chlorobenzene and bromobenzene at various temperatures

Abstract

Volumetric and acoustic properties of p-cymene with fluorobenzene, chlorobenzene and bromobenzene have been investigated using density, (ρ), and speed of sound, (U) measurements over the entire composition range at T= (303.15, 308.15 and 313.15) K. From the experimentally measured density, (ρ); Excess molar volumes, (V), infinite dilution partial molar volume, (, i) excess partial molar volume, (,) apparent molar volume, (V,_{m,ϕ, 1}), infinite dilution apparent molar volume, (V, , _{ϕ, 1}) with empirical parameters, S_v, B_v and limiting apparent molar expansibility, (E) have been calculated. Deviation in speed of sound (U), deviation in isentropic compressibility, (k_s), deviation in acoustic impedance, (z), infinite dilution partial molar isentropic compressibility, (,_{m, i}), excess partial molar isentropic compressibility, (,_i), apparent molar isentropic compressibility, (K_s,m,ϕ,i), infinite dilution apparent molar isentropic compressibility, (K_m,ϕ,1) with empirical parameters S_k and B_k and intermolecular free length (L_f) have been calculated using experimentally measured speed of sound, (U). To derive fitting coefficients, (Ai) with standard deviation, (σ), excess properties were fitted to the Redlich-Kister type polynomial equation. Various theoretical speed of sound and average deviations have been calculated using well established equation like Nomoto, (U_nmt) Ideal Mixing Rule, (U_imr) Junji, (U_junji) and Jacobson’s Free Length Theory, (U_flt). The variation of these properties with composition and temperature has been discussed in terms of molecular interaction on mixing and their interacting abilities have also been compared.