Densities and Viscosities for Binary Liquid Mixtures of Pentanol Isomers from (288.15 to 328.15) K at 0.1 MPa

Abstract

This paper presents densities and viscosities of binary mixtures of 1pentanol + 2-pentanol, 1-pentanol + 2-methyl-1-butanol, and 2-pentanol + 2-methyl-1-butanol from (288.15 to 328.15) K over the entire concentration range at atmospheric pressure. Experimental densities and viscosities are measured using a vibrating tube densimeter and a glass capillary viscometer, respectively. The relative standard uncertainties estimated in the density and viscosity were 4.8 × 10 −4 and 0.01, respectively. Densities and viscosities of the binary mixtures are compared with the limits established by the diesel fuel standard (EN 590). The binary mixtures of 1pentanol + 2-methyl-1-butanol, and 2-pentanol + 2-methyl-1-butanol could be considered as alternative substitutes for diesel fuel. Excess molar volume values suggest that these mixtures behave as ideal solutions. Viscosity deviations are negative for all of the mixtures investigated in this study. The Redlich−Kister equation is used to represent the behavior of the excess molar volumes and viscosity deviations as a function of the composition. The Nava-Ri ́os and McAllister equations correlate the kinematic viscosity values with an average absolute percentage deviation of 0.139% and 0.203%, respectively.

Densities, Viscosities, and Derived Properties for Binary Mixtures of Long-Chain Alcohols of 1-Hexanol + 1-Pentanol, + 2-Pentanol, + 2-Methyl-1-butanol, + 1-Heptanol, and + 1-Octanol from 288.15 to 338.15 K

“…Pflug and Benson reported positive deviations of the excess molar volume for the mixture of 1-hexanol + 1-octanol at 298.15 K. In this work, for the mixture of 1-hexanol + 1-octanol, the V E presents slight negative deviations over the entire range of compositions from 288.15 to 338.15 K. Figure shows the comparison between our experimental values and those reported by Pflug and Benson Negative deviations of the V E have been previously reported in the literature for different mixtures between long-chain alcohols (pentanol isomers and butanol isomers). − Also, these types of mixtures tend to form hydrogen bonds between different alcohols, causing a contraction in the volume of the mixture. On the other hand, Pflug and Benson mention that the estimated overall error of the volume measurement varies from ±0.5%.…”

“…The V E shows a minimum value at alcohol mole fractions around of x 2 ≈ 0.300, 0.300, and 0.301 for the mixtures of 1-hexanol with 2-pentanol, 2-methyl-1-butanol, and 1-octanol from 288.15 to 338.15 K, respectively. Negative deviations of V E suggest the presence of attractive intermolecular forces between different alcohol molecules, such as stronger London forces, dipole–dipole interactions, and hydrogen bonding, causing a contraction in the volume of the mixture. , In addition, structural effects such as interstitial accommodation between alcohol molecules contribute to a decrease in the molar volume of the mixture. This condition is due to variances in the free volumes and molar volumes of the alcohol in the mixture .…”

“…The calculated values of the V E for the mixtures of 1-hexanol + 1-pentanol, + 1-heptanol, + 2-methyl-1-butanol, and 1-octanol are so small that the alcohol mixtures behave almost as an ideal solution at all the temperatures considered in this work. 2,9,16 For the other mixture (1-hexanol + 2-pentanol), this behavior occurs only at low temperatures. Under these conditions (V E → 0), the estimated standard uncertainty of V E (u(V E ) = 0.169 cm 3 •mol −1 ) is greater than the values of V E .…”

“…Alcohols have two primary applications: (i) they are used an industrial solvent, mainly for the manufacture of paints, hydraulic fluids, perfumes, and lacquers, and (ii) they are used as biofuel additives . Recently, long-chain alcohols ( n - or i -C 4 –C 8 ) have been implemented as new additives for biodiesel and bio-jet fuel. ,− In the literature, it has been reported that the use of alcohols as additives decreases the density, viscosity, and surface tension values of biodiesel + alcohol or bio-jet fuel + alcohol mixtures, decreasing the differences between the physicochemical properties of the new alternative fuel and the conventional fossil fuel. ,, Likewise, mixtures of long-chain alcohols (C 4 –C 8 ) have been proposed as a new alternative fuel to fossil fuel. − Therefore, densities and viscosities are required for the design of the fuel tank, fuel feed pump, injection pump, filter, fuel injector, and high-pressure pipe. Density impacts the injection system remarkably, mainly caused by the differences in the volume of fuel supplied to the engines.…”

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

“… a Standard uncertainties u are u ( p ) = 0.5 kPa, u ( T ) = 0.01 K, u e (ρ) = 0.00049 g·cm –3 , u e (η) = 0.063 mPa·s. b Ref . c Ref . d Ref . e Ref . f Ref . g Ref . h Ref . i Ref . j Ref . k Ref . l Ref . m Ref . n Ref . o Ref . …”