Speeds of sound and isentropic compressibilities of {xCH3O(CH2)2OH+(1−x)H(CH2)ν(OCH2CH2)2OH} (ν=1, 2, and 4) at the temperature 298.15 K

doi:10.1006/jcht.1996.0185

The Journal of Chemical Thermodynamics

Volume 29, Issue 6, June 1997, Pages 639-648

https://doi.org/10.1006/jcht.1996.0185 Get rights and content

Abstract

The speed of sounduhas been obtained at a frequency of 4 MHz in {xCH₃O(CH₂)₂OH+(1−x)H(CH₂)_ν(OCH₂CH₂)₂OH} for ν=1, 2 and 4 over the whole range ofxatT=298.15 K and atmospheric pressure, using a NUSONIC velocimeter based on the sing-around technique. The excess molar volumes were taken from a previous paper and combined with the measured values of the ultrasonic speeds to give estimates of the productK_S,mof the molar volume and the isentropic compressibility κ_S, and the excess quantityK_S,m^E. The deviations of the speeds of soundu^Dwere compared with the mixing function δucalculated in the paper. The behaviour ofu,u^D, δu, andK_S,m^Ewith composition and number of carbon atoms in the aliphatic chain of the alkoxyethanol is discussed.

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Excess enthalpy, H^E, density, $ρ$ , speed of sound, u, and refractive index, $n_{D}$ , measured data (312 points) are presented for {2-(2-ethoxyethoxy)ethanol (carbitol) with 1-hexene, or cyclohexane, or methylcyclohexane} at 0.1 MPa and (298.15 and 313.15) K throughout the full range of composition. Consequently, derivative properties were determined from the reported experimental data: $V^{E}$ , excess volume, $K_{s}$ , isentropic compressibility, $Δ K_{s}$ , deviation in isentropic compressibility, $Δ n_{D}$ , deviation in refractive index. The modified Redlich-Kister is employed for the experimental data correlation of H^E, while the Predictive Peng-Robinson 1978 (PPR78) EoS is used to model the measured data of H^E. As a comparison with PPR78 EoS, the NRTL and UNIQUAC models are applied to have a prediction on the experimental H^E data. Also, the Redlich-Kister equation is employed to fit the excess volume, deviation in isentropic compressibility and deviation in refractive index. In the present work, we have discussed intermolecular interactions for the studied binary mixtures.
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Regular articleSpeeds of sound and isentropic compressibilities of {xCH3O(CH2)2OH+(1−x)H(CH2)ν(OCH2CH2)2OH} (ν=1, 2, and 4) at the temperature 298.15 K

Abstract

Regular article
Speeds of sound and isentropic compressibilities of {xCH₃O(CH₂)₂OH+(1−x)H(CH₂)_ν(OCH₂CH₂)₂OH} (ν=1, 2, and 4) at the temperature 298.15 K