Densities and Viscosities for the Ternary Mixtures of <i>n</i>-Undecane (1) + Butylcyclohexane (2) + 1-Pentanol (3) and Corresponding Binaries at <i>T</i> = (293.15 to 333.15) K

This study measured the densities, viscosities, and speeds of sound of mixtures of n-pentadecane with n-alkylcyclohexanes (methyl-, ethyl-, propyl-, butyl-, pentyl-, hexyl- heptyl-, octyl-, decyl-, and dodecylcyclohexane) and determined excess molar volumes (V m E’s), excess speeds of sound (c E’s), excess isentropic compressibilities (K s E’s), and viscosity deviations (Δη’s). For each n-alkylcyclohexane, mixture V m E, c E’s, K s E’s, and Δη’s for n-pentadecane fell between previously reported values for n-tetradecane and n-hexadecane. In general, mixture V m E’s increased with decreases in n-alkylcyclohexane’s molar mass. Mixture c E’s and Δη’s decreased with increasing n-alkylcyclohexane molar mass until a minimum was reached after which the c E’s and Δη’s increased. The mixture K s E’s increased with increasing n-alkylcyclohexane molar mass until a maximum was reached after which the K s E’s decreased. For many of the mixtures, the V m E’s and K s E’s had the same sign, thereby suggesting that the deviations in mixture compressibility were impacted by deviations in the volume occupied by the molecules. A notable exception was methylcyclohexane, which had the largest positive V m E but a negative K s E. Its greater volume was less compressible. The n-pentadecane could be used in surrogate mixtures to replace n-hexadecane when a smaller density, viscosity, and speeds of sound are needed to properly model a fuel of interest.

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: T/kmentioning

confidence: 99%

Section: T/kmentioning

confidence: 99%

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n-Pentadecane and n-Alkylcyclohexane Mixtures: Viscosity Deviations and Excess Molar Volumes, Speeds of Sound, and Isentropic Compressibilities at 0.1 MPa

Prak

2023

Undecane and n-Alkylcyclohexanes Binary Mixtures: Densities and Speeds of Sound between 288.15 and 333.15 K and Viscosities between 293.15 and 323.15 K at 0.1 MPa

Luning Prak,

Cowart

2023

The densities, dynamic viscosities, and speeds of the sound of mixtures of undecane with n-alkylcyclohexanes (methyl-, ethyl-, propyl-, butyl-, pentyl-, hexyl-, nonyl-, decyl-, and dodecylcyclohexane) were measured between 288.15 and 333.15 K and 0.1 MPa. Increasing temperature decreased the density, viscosity, and speed of sound. Increasing the concentration of components with higher property values produced mixtures with higher property values for most systems. Excess molar volumes (V m E’s) ranged from −0.33 to 0.17 cm3·mol–1. For equimolar mixtures, the V m E’s decreased as the n-alkyl chain length increased. Viscosity deviations based on a log-linear relationship (Δη’s) ranged from −0.04 to 0.22 mPa·s. The n-hexylcyclohexane mixtures produced the smallest Δη’s. Excess speeds of sound (c E’s) ranged from −3.3 to 12.4 m·s–1 and excess isentropic compressibilities (K s E’s) varied from −13.8 to 2.7 TPa–1. Ethylcyclohexane mixtures produced the smallest c E values and the largest K s E. The V m E’s and K s E’s for most mixtures were the same sign, thereby suggesting that the deviations in the volume occupied by the molecule affected the mixture compressibility. These data provide information to researchers who are seeking alternative mixtures to represent fuels and those looking at the impact of blendstock material on fuel behavior and molecular interactions.

Binary Mixtures of Nonane and n-Alkylcyclohexanes: Densities and Speeds of Sound within the Temperature Range (288.15–333.15) K and Viscosities at 288.15, 293.15, and 298.15 K and 0.1 MPa

Luning Prak

2024

This work reports the density, viscosity, and speed of sound of nonane in binary mixtures with n-alkylcyclohexanes (methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, decyl, and dodecyl) and the derived properties of excess molar volume (V m E), excess speed of sound (c E), excess isentropic compressibility (K s E), and viscosity deviation (Δη). The densities, speeds of sound, and viscosities ranged from 686.39 to 825.77 kg·m–3, from 1065.9 to 1442.3 m·s–1, and from 0.66 to 9.21 mPa·s, respectively. For most mixtures, the mixture densities, viscosities, and speeds of sound increased with increasing concentration of the component with the higher property value and with decreasing temperature. The K s Es and V m Es of the nonane mixtures decreased monotonically and the c Es increased monotonically as the size of the alkylcyclohexane increased. The smallest Δη value was found for n-hexylcyclohexane/nonane mixtures. For most mixture systems, the signs of K s E and V m E were the same, suggesting that enhanced volumes were more compressible, and reduced volumes were less compressible than the space taken up by the individual components. The excess properties and deviation of the nonane mixtures followed trends that are consistent with those of other linear alkanes mixed with the same alkylcyclohexanes.