Heat Capacity, Speed of Ultrasound, and Density for 1,5-Dibromopentane + Heptane within the Temperature Range from 293.15 K to 313.15 K

Abstract

Densities for binary mixture 1,5-dibromopentane + heptane have been measured within the temperature range from 293 K to 313 K using a vibrating tube densimeter. The phase speeds of ultrasound have been measured with a pulse−echo−overlap apparatus. The heat capacities at constant pressure have been measured with a differential scanning calorimeter DSC III (Setaram). From those experimental data, the excess molar volumes, V E, excess isobaric molar heat capacities, , excess isentropic compressibilities, , excess isothermal compressibilities, , and excess ultrasonic speeds, u E, were calculated.

Thermodynamic and Acoustic Properties of Mixtures of Dibromomethane + Heptane

“…Its minimum approximately corresponds to the maximum of the excess speed. That have also been observed for the binary mixtures of heptane with 1,2-dibromoethane [7,9] and 1,5-dibromopentane [8,9]. It seems to be a general feature of those systems.…”

“…For the pure dibromoalkanes, the attention has been focused on the improvement of group contributions for the estimation of heat capacities [6]. Investigations of the 1,5-dibromopentane + heptane and 1,2-dibromoethane + heptane mixtures revealed that the systems were thermodynamically non-ideal [7][8][9]. That seems a general feature of the haloalkane + alkane systems.…”

Calculation of the Isobaric Heat Capacities of the Liquid and Solid Phase of Organic Compounds at and around 298.15 K Based on Their “True” Molecular Volume

“…Beyond these compilations a large number of recent papers presenting the heat-capacity data of several classes of compounds and of individual molecules of any kind as well as their temperature dependence have been published up to the present. Special mention shall be given to the hydrocarbons [49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65], halogenated hydrocarbons [66,67,68,69,70,71], unsubstituted and substituted alcohols and polyols including sugar derivatives [72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107], phenol derivatives [108,109], carboxylic acids […”

Thermodynamic and Acoustic Properties of 1,3-Dibromopropane and 1,5-Dibromopentane within the Temperature Range From 293K to 313K at Pressures up to 100MPa

“…The required speeds of sound, densities, and heat capacities of 1,5-dibromopentane at atmospheric pressure were taken from our earlier study [5]. However, the isobaric heat capacities of 1,3-dibromopropane were taken from the previous study [2].…”

“…To the best of our knowledge, for the substances studied in this article, no experimental data corresponding to speed of sound, density, and heat capacity under high pressures are available in the accessible literature. This prompted us to continue our earlier calorimetric and acoustic study of pure halogenoalkanes [2][3][4] and their mixtures with aliphatic alkanes [5,6] and to expand it to the speed-of-sound measurements under elevated pressures.…”