Korelacja między prędkością propagacji ultradźwięków a Entalapią mieszania wodnych roztworów amin alifatycznych i cyklicznych

• Autorzy: Marczak W. , Ernst S.
• Języki publikacji: PL

Abstrakty

EN

The relationship between the speed of ultrasound in a fluid (c) and its enthalapy (H) is given by the following equations: c= square root V2 /(KSM) (the Laplace formula), V=(partial differential H/partial differential p)s and Ks = -(partial differential2/partial differential p 2)s , where V - molar volume, KS - molar adiabatic compres molar mass of the substance, p - pressure and S - entropy. Thus, since for the calculation the speed of sound from the corresponding thermodynamic functions the equation of state has to be known, which most often is not the case, reliable correlations between the speed thermodynamic characteristics seem to be of interest. An attempt was undertaken to correlation of this type for 13 binary water - amine mixtures. The correlation of the of the speed isotherms with the first enthalpies of solution in water (at 298.15 K; based on the literature data) is shown in Figure 3. Some correlations are also observed between the) of sound and the enthalpies of mixing (Figs 4 and 5). The reported correlations may be used for a preliminary prediction of the enthalapy mixing from ultrasonic data. Calorimetric measurements are rather time-consuming and difficult in comparison with the ultrasonic ones, thus an estimation of the enthalpy effect in this way, although being only a rough one, could be useful both in practical application in calorimetric studies.

• Wydawca: Silesian Division of Polish Acoustical Society
• Czasopismo: Molecular and Quantum Acoustics
• Rocznik: 1998
• Tom: Vol. 19
• Strony: 179--184
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Marczak W.

autor

Ernst S.

• University of Silesia, Institute of Chemistry, Szkolna 9, 40-006 Katowice