Andrzej J. Treszczanowicz

Excess volumes for n-alkanols +n-alkanes IV. Binary mixtures of decan-1-ol +n-pentane, +n-hexane, +n-octane, +n-decane, and +n-hexadecane☆

Abstract Excess volumes measured at 298.15 K in a successive-dilution dilatometer are reported for binary mixtures of decan-l-ol with the n-alkanes C5, C6, C8, C10, and C16. The measurements were extended to high dilutions of decan-1-ol. The excess volume is negative over the whole mole-fraction range for the C5 mixture, sigmoid with increasingly positive values in the alkane-rich region for C6, C8, and C10 mixtures, and positive over the whole mole-fraction range for the C16 mixture. Partial molar excess volumes of the components were calculated for each mixture, and their values at infinite dilution were estimated. The excess volumes of these mixtures are attributed to a balance between chemical, physical, and structural effects.

Excess volumes for n-alkanols + n-alkanes II. Binary mixtures of n-pentanol, n-hexanol, n-octanol, and n-decanol + n-heptane☆

Abstract Measurements of excess volumes at 298.15 K in a successive dilution dilatometer are reported for binary mixtures of the n -alkanols C 5 , C 6 , C 8 , and C 10 + n -heptane. All the excess volume curves are sigmoid but the region of positive values of the excess volume decreases markedly with increasing length of the alkanol molecule, and for n -decanol+ n -heptane is limited to mole fractions of alkanol less than 0.03. Partial molar excess volumes of the components were calculated for each mixture and their values at infinite dilution were estimated.

Excess volumes for n-alkanols + n-alkanes I. Binary mixtures of methanol, ethanol, n-propanol, and n-butanol + n-heptane☆

Excess volumes VE measured at 298.15 K in a successive-dilution dilatometer are reported for binary mixtures of the n-alkanols C1 to C4 + n-heptane. For ethanol +, and n-butanol + n-heptane, the measurements were extended to high dilutions of alkanol. VE is positive for all of the mixtures but decreases rapidly in magnitude for increasing chain length of the n-alkanol. The results were used to estimate the excess partial molar volumes of the components.

Excess volumes for n-alkanols + n-alkanes III. Binary mixtures of hexan-1-ol + n-pentane, + n-hexane, + n-octane, and + n-decane

Abstract Measurements of excess volumes at 298.15 K in a successive dilution dilatometer are reported for binary mixtures of hexan-1-ol with the n -alkanes C 5 , C 6 , C 8 , and C 10 . In this series of mixtures, the excess-volume curves change from sigmoid with positive values in the alkanol-rich region for mixtures with n -pentane, to positive values over the whole mole-fraction range for mixtures with n -decane. The positive region for (hexan-1-ol + n -pentane) occurs below 0.02 mole fraction of C 6 H 13 OH, and measurements were extended to high alkanol dilutions. Partial molar excess volumes of the components were calculated for each mixture, and their values at infinite dilution were estimated.

Excess volumes and isentropic compressibilities for (2-ethoxyethanol + n-heptane) at 298.15 K

Abstract Excess volumes and ultrasonic speeds have been measured for (2-ethoxyethanol + n-heptane) at 298.15 K. Isentropic compressibilities, excess isentropic compressibilities, and the partial molar excess quantities K S, i E = −( ∂V i E ∂p ) S were calculated from the results. The excess volume is positive over the entire mole-fraction range, whereas the curves for the excess isentropic compressibility is sigmoid with negative values occurring at mole fractions of 2-ethoxyethanol greater than 0.35. A qualitatitive interpretation of the results is presented.

Excess volumes and ultrasonic speeds for (di-n-propylether + n-heptane)

Excess molar volumes VmE, at 288.15, 298.15, and 308.15 K, and ultrasonic speeds at 298.15 K are reported for (di-n-propylether + n-heptane). From the results, the differential coefficients (∂VmE∂T)p and (∂VmE∂p)s were estimated over the entire mole-fraction range.

Excess volumes for (2-methylbutan-2-ol + n-heptane) and for (cyclopentanol + n-heptane)☆

Abstract Excess volumes measured at 298.15 K in a successive-dilution dilatometer are reported for binary mixtures of (2-methylbutan-2-ol + n -heptane) and of (cyclopentanol + n -heptane). The 2-methylbutan-2-ol mixture exhibits positive excess volumes over the whole mole-fraction range. In contrast to this behavior, the excess volumes of the cyclopentanol mixture show a sigmoid dependence on composition, with positive values limited to lower mole fractions of alkanol than observed previously for (pentan-1-ol + n -heptane). Excess partial molar volumes of the components were calculated for both mixtures, and their values at infinite dilution were estimated. The excess volumes of these mixtures are attributed to a balance between H-bonding, non-specific interactions, and structural effects.

Excess volumes for (an n-alkanol + an n-alkane) V. (Dodecan-1-ol + n-heptane)

Abstract Excess volumes, measured in a successive-dilution dilatometer, are reported for (decan-1-ol + n -heptane) at 298.15 K. The measurements were extended to high dilutions of decan-1-ol. The excess volume is predominantly negative, attaining positive values only at mole fractions of decan-1-ol less than 0.018.

Excess volumes and isentropic compressibilities of decan-1-ol + 2,2-dimethylbutane and + 2,2,4-trimethylpentane

Abstract Excess volumes and ultrasonic speeds are reported for decan-1-ol + 2,2-dimethylbutane and + 2,2,4-trimethylpentane at 298.15 K, including values for high dilutions of decan-1-ol. Excess isentropic compressibilities were calculated from the results. The excess volumes and excess isentropic compressibilities are negative for both mixtures and their magnitudes are larger than those for decan-1-ol + either of the respective n -alkane homologues.

Thermodynamic Excess Properties of the 1-Alkylamine + Alkane and di-n-Alkylamine + Alkane Systems in Terms of an Associated Mixture Model with Equation of State Contribution

Abstract The model proposed by Treszczanowicz and Benson (1985) is applied for the description and interpretation of excess enthalpy HE, excess volume VE and excess molar isobaric heat capacity CEp of the binary systems formed by 1-alkylamines and dialkyl-amines with n-alkanes. In the model, the self-association contribution is described by an athermal associated mixture model with the continuous mode of association of the Mecke–Kempter type and the equation of state contribution described by the Flory theory. The three self-association parameters: enthalpy, entropy and volume are valid over the whole homologous series of 1-alkylamines and dialkylamines. The equation of state interaction parameters are correlated for both series of mixtures with the structure of the component molecules by using the Kehiaian–Guggenheim group contribution method. The model predicts reasonably well HE as well as VE for both these classes of mixtures.