Elsevier

Fluid Phase Equilibria

Volume 469, 15 August 2018, Pages 33-39
Fluid Phase Equilibria

High pressure and high temperature volumetric properties of (2-propanol + di-isopropyl ether) system

https://doi.org/10.1016/j.fluid.2018.04.012Get rights and content

Highlights

  • New density data for binary mixtures of 2-propanol + DIPE are reported.

  • The pressure and temperature intervals are 0.1–140 MPa and 293.15–393.28 K.

  • 810 data points measured at 6 compositions were fitted to a Tait-like equation.

  • Excess volumes have been calculated from the experimental data.

  • The isobaric expansivity and the isothermal compressibility have been derived.

Abstract

New experimental density data are reported for binary mixtures of 2-propanol + di-isopropyl ether over the composition range (6 compositions; 0.15 ≤ 2-propanol mole fraction x ≤ 0.85), between 293.15 and 393.28 K, and for 23 pressures from 0.1 MPa up to 140 MPa. Measurements were performed by means of an Anton Paar vibrating tube densitometer, calibrated with an uncertainty of 7 × 10−4 g cm−3. A Tait like equation was used to fit the experimental density data, with low standard deviations. Excess volumes have been calculated from the experimental data and fitted by the Redlich–Kister equation. Moreover, the isothermal compressibility and the isobaric thermal expansivity have been derived from the Tait-like equation.

Introduction

Oxygenated compounds, such as ethers and alcohols, are used to improve the thermo-physical properties of new bio-fuels as environmentally friendly fluids. Future developments of vehicles require essentially that engine is efficient and clean-burning, even in electrical hybrid vehicles. Present advanced bio-ethers (bio-ETBE, bio-MTBE, bio-TAME and bio-TAEE), are part of the present solution towards a low carbon transport fuels [1]. The branched alkyl ether di-isopropyl ether (DIPE), due to its exceptionally good octane enhancing properties when used as a gasoline blend stock, could also be considered as potential bio-ether. Concerning alcohols, besides the most popular bioethanol, the potential of biologically derived propanols (biopropanols) and butanols (biobutanols) are considered also as an alternative to bioethanol as a transportation fuel. It is due to their higher carbon number and therefore a higher energy density than ethanol [2], as well as they improve combustion and reduce emissions and the contaminant agents of automobile catalysts. Study of mixtures of DIPE with higher bio-alcohols could help to increase the knowledge of complex multicomponent biofuels. 2-Propanol, which can be produced from biomass by microbial fermentation [3], has the potential of becoming fuel additive. Accurate PVT properties of the system 2-propanol + DIPE are required to develop and test equations of state, particularly at high pressure due to the requirements of the chemical industry.

This contribution continues the research on volumetric properties of binary mixtures of alcohols and ethers at high pressure carried out by our group [[4], [5], [6]]. In this work we report volumetric properties of (2-propanol + DIPE) over the complete composition range at the temperatures from 298.15 K to 393.29 K and at pressure up to 140 MPa. The excess molar volumes were also calculated, as well as some derived thermodynamic properties such as isobaric thermal expansivity, αp, and the isothermal compressibility, κT, for the given binary mixtures. Previous measurements of the system 2-propanol + DIPE have been performed at only 298.15 K and 0.1 MPa [[7], [8], [9], [10], [11], [12]]. No literature references at high pressure for these mixtures have been found.

Section snippets

Materials

Table 1 presents the purity and related data of 2-propanol and DIPE, which were obtained from Sigma-Aldrich. Storage over a molecular sieve and previous careful degassing of both liquids were the only operations performed before its use. Degasification of pure fluids was done at a first step, by means of an ultrasonic bath PSelecta, model Ultrasons-H, to prevent bubbles formation and consequently an air intake in the densitometer.

Measurement technique. Experimental procedure

Density has been measured with a vibrating-tube densitometer

Experimental density data

The results for densities of (2-propanol + di-isopropyl) at six 2-propanol molar ratio compositions (0.1503, 0.2979, 0.4228, 0.5000, 0.6737, 0.8483) are reported in Table 2 along the six isotherms from (298.15–393.28) K at pressures up to 140 MPa (23 isobars).

New Tait representation

A Tait-like equation was used to correlate the experimental data over the entire temperature and pressure ranges:ρ(T,p)=ρ0(T)1Cln(B(T)+pB(T)+0.1MPa)whereρ0(T)=A0+A1T+A2T2+A3T3B(T)=B0+B1T+B2T2

The Ai, Bi and C parameters values were

Acknowledgements

The authors acknowledge support for this research to the Ministerio de Ciencia e Innovación, Spain, Project ENE2009-14644-C02-02, and to the University of Burgos (M. Dakkach, staff mobility program 2011).

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Cited by (4)

  • Experimental and modeling study of diisopropyl ether and 2-alkanol; PC-SAFT model and free volume theory

    2020, Journal of Chemical Thermodynamics
    Citation Excerpt :

    For this reason, in the present study, as a continuation of our previous work focusing on interactions between alcohols and different functional groups [3–10], binary mixtures containing DIPE with 2-alkanol were selected. A survey in scientific literature demonstrates that previously, values of densities for binary mixtures of DIPE with 2-propanol and 2-butanol were published [2,11–16]. But no reports are available for binary viscosities or some binary densities.

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