Excess Molar Volumes and Viscosities of Binary Systems of Butylcyclohexane with n-Alkanes (C7 to C14) at T = 293.15 K to 313.15 K

Abstract

Experimental values of densities and viscosities have been measured in the binary mixtures of butylcyclohexane (BCH) with n-heptane, n-octane, n-nonane, n-decane, n-dodecane, and ntetradecane at temperatures T = (293.15 to 313.15) K and pressure p = 0.1 MPa over the entire mole fraction range. The excess molar volumes (V m E ) and viscosity deviations (Δη) are calculated, and then the changes of V m E and Δη with the composition of BCH are fitted to the Redlich−Kister equation. The values of densities increase continuously with the increase of mole fraction of BCH while the values of viscosities show different trends. All the densities and viscosities decrease with the rise of temperature. The variations of V m E and Δη are discussed with the change of mole fraction of BCH and temperature. This work is useful to understand the molecular interaction in binary systems of liquid.

Density, Viscosity, Speed of Sound, Bulk Modulus, Surface Tension, and Flash Point of Selected Ternary Mixtures of n-Butylcyclohexane + a Linear Alkane (n-Hexadcane or n-Dodecane) + an Aromatic Compound (Toluene, n-Butylbenzene, or n-Hexylbenzene)

“…U c (ρ) = 0.69 kg·m –3 for T < 343.15 K and U c (ρ) = 2.0 kg·m –3 for T ≥ 343.15 K; n -butylbenzene, U c (ρ) = 0.17 kg·m –3 for T < 343.15 K and b Reference : Equation for best of density of n -hexadecane is ρ/kg·m 3 = 956.848 – [0.557634 × T /K] + [2.68578 × 10 –4 × ( T /K) 2 ] – [1.24436 × 10 –7 × ( T /K) 3 ]. c Reference . d Reference . e Reference . f Reference . g Reference . h Reference . i Reference . j Reference . Equation for best of density of butylcyclohexane is ρ/kg·m 3 = 1127.02 – [1.46341 × T /K] + [1.17912 × 10 –3 × ( T /K) 2 ]. k Reference . l Reference . m Reference . n Reference . Equation for best of density of toluene is ρ/kg·m 3 = 1.18621 × 10 3 – [1.47573 × T /K] + 2.08566 × 10 –3 × ( T /K) 2 – 2.61945 × 10 –6 ( T /K) 3 . o Reference . p Reference . q Reference . r Reference . s Reference . t Reference . u Reference . v Reference . w References and for error. x Reference . y Reference . z Reference . …”

“… a Reference . b Reference . c Reference . d Reference . e Reference . f Reference . g Reference . h Reference . i Reference . j Reference . k Reference . l Reference . m Reference . n Reference . o Reference . p Reference . q Reference . r Reference . s Reference . t Reference . u Reference . v Reference . w Reference . x Reference . y Reference . z Literature values for viscosity of hexylbenzene were converted from mm 2 ·s –1 in ref using density values in the current work. aa Reference . ab Standard uncertainties u are u ( T ) = 0.01 K, expanded uncertainties U c are U c (η) = 0.01 mPa·s. The average pressure P for these measurements was 0.102 MPa with an expanded uncertainty U c ( P ) = 0.002 MPa (level of confidence = 0.95, k = 2). …”

“…Viscosity deviation (Δviscosity) is the difference between the measured value and an “ideal value”: The ideal viscosity can be based on either kinematic viscosity, dynamic viscosity, or natural logarithms of these values. ,,− The instrument used in this study measures dynamic viscosity, so ideal viscosities (η ideal ) were calculated by ,,,,,, or from where η 1 , η 2 , and η 3 are the dynamic viscosities of the pure components, and x 1 , x 2 , and x 3 are their mole fractions with the aromatic compound as component 1, n- butylcyclohexane as component 2, and the n- alkane as component 3. The viscosity deviations calculated using eqs – have been related to the strength of intermolecular interactions between mixing components, , and Grunberg and Nissan included an extra term in their prediction of viscosity in a 2-component system (η mix ) to account for these interactions: where d is the “characteristic constant of the system.”…”

“…Previous studies have investigated the physical properties of mixtures containing these compounds. The density and viscosity have been measured for two-component mixtures of butylcylclohexane with n -alkanes ranging from n -heptane to n -hexadecane, − two-component mixtures of toluene with n -alkanes ranging from n -octane to n -hexadecane, − and two-component mixtures of butylbenzene with n -alkanes ranging from n -decane to n -heptadecane, and two-component mixtures of hexylbenzene with hexadecane . The density and speed of sound have been measured for two-component mixtures of toluene with cyclohexane, methylcyclohexane, and butylcyclohexane. , These studies have reported excess molar volumes that deviate from zero in either a positive or negative direction depending on the study.…”

Properties of Two-Component Mixtures of Isobutylcyclohexane (1) or tert-Butylcyclohexane (1) with n-Dodecane (2) or n-Hexadecane (2): Densities, Surface Tensions, Viscosities, and Speeds of Sound at 0.1 MPa and Various Temperatures

“…Dooley et al have demonstrated that cyclic compounds need to be present in surrogate mixtures to produce combustion behavior that is similar to jet fuel . Surrogate mixtures have included cyclohexanes with substituents up to four carbons long. − The properties of binary mixtures of n -butylcyclohexane in various linear alkanes (C 6 to C 16 ) , have been reported, but no study has published the properties of dodecane and hexadecane in t -butylcyclohexane and isobutylcyclohexane, which are isomers of n -butylcyclohexane. Isobutylcyclohexane has been found in the jet propellant, Endothermic Hydrocarbon Fuel-Tianjin University (EHF-TU), and is also formed during the catalytic cracking of heavier fuel compounds .…”