Theoretical
Evaluation of Ultrasonic Velocities in Binary Liquid Mixtures of Diethyl
Malonate with Branched Alkanols at Different Temperatures
ABSTRACT
Ultrasonic velocities
and densities of the binary liquid mixtures of diethyl malonate with 3- methyl -1- butanol, 2- methyl -1-
propanol, 2-propanol and 2-butanol have been measured at temperatures (303.15,
308.15 , 313.15 , and 318.15) K over the entire composition range of ester. The
theoretical values of ultrasonic velocity were evaluated using Nomoto relation, Impedance
relation, Van Dael and Vangeel relation, Junjie’s relation, Rao’s specific
velocity relation, Kudriavtsev relation and Danusso model. The molecular collaboration factor has been assessed from
the standards of investigational and theoretical velocities. The variant of
this collaboration factor with the composition mixture has been debated in
terms of molecular collaborations.
INTRODUCTION
The thermodynamic properties of fluids
and fluid mixtures [1] have been exploited to identify the molecular relations comprising
the components of a mixture and also for manufacturing applications relating to
the heat transfer, mass transfer and fluid flow. The binary mixtures comprising
diethylmalonate and alcohols were favored in the current investigation on the source
of their industrial importance. Diethyl malonate (DEM) remains the diethyl
ester of malonic acid. DEM is a colourless fluid. The odour of DEM is like that
of apple juice. It is utilized in perfumes, preparation of the compounds such
as barbiturates, vitamin B1, Vitamin B6 and synthetic
flavorings. Alcohols are employed as hydraulic fluids in pharmaceutical and
cosmetics, in medications for animals, in manufacturing perfumes, paint
removers, flavors and dyestuffs, as defrosting and as antibacterial agents [2].
Ultrasonic sound velocity of
liquid mixtures containing polar as well as non-polar groups are of extensive
significance in understanding intermolecular interaction involving constituent
molecules [3-8]. Relative studies on the tentative theoretical assessments of
ultrasonic velocities for different organic liquid mixtures using different representations
resembling Nomoto [9-10], Impedance relation [11], Van Dael and Vangael [12],
Junjie [13], Rao’s specific velocity [14], Kudriavtsev relation [15] and
Danusso model [16] have been carried out by various researchers. The current
study is an extension of our research programme on application of theoretical
models of ultrasonic velocities of liquid binaries at various temperatures [17-21].
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