Vapour–liquid equilibria in binary and ternary systems composed of 2,3-dimethylbutane, diisopropyl ether, and 3-methyl-2-butanone at 313.15, 323.15 and 313.15 K
Highlights
► We have measured new experimental data on vapour–liquid equilibria at isothermal conditions. ► Three binary and one ternary systems consisting of 2,3-dimethylbutane + diisopropyl ether + isopropyl methyl ketone were investigated. ► Correlation of data with use of the Wilson and NRTL equation. ► Prediction of phase equilibria in ternary system based on binary data.
Introduction
This paper reports new results of a continuing project dealing with phase equilibria in mixtures belonging to distinct families of organic compounds. Here we determined the vapour–liquid equilibria (VLE) for three binary and one ternary system containing hydrocarbon, ether, and ketone. In a series of our earlier papers, we have already investigated systems having a common alkyl group (isopropyl or tert-butyl), namely 2-propanol + diisopropyl ether + 2,2,4-trimethylpentane [1], tert-butanol + 2,2,4-trimethylpentane + 1-tert-butoxy-2-propanol [2], tert-butyl methyl ether + tert-butanol + 2,2,4-trimethylpentane [3], 2-propanol + diisopropyl ether + 1-methoxy-tert-butyl methyl ether [4], 2-propanol + diisopropyl ether + 4-methyl-2-pentanone [5], 2-methylpentane + 3-methyl-2-butanone + 3-methyl-2-butanol [6], 2-propanol + 3-methyl-2-butanone + 2,2,4-trimethylpentane [7], tert-butyl methyl ether + 3,3-dimethyl-2-butanone + 2,2-dimethyl-1-propanol [8], and 2,2,4-trimethylpentane + 2-methyl-1-propanol + 4-methyl-2-pentanone [9]. The next in the series of experiments aimed at completing our database are systems containing compounds that share the alkyl group [isopropyl (CH3)2CH
], ether group O, and carbonyl group 
C
O with the already investigated systems. The compounds used in this experiment were 2,3-dimethylbutane, diisopropyl ether, and 3-methyl-2-butanone. The new data were measured at three isothermal levels: 313.15, 323.15, and 333.15 K.
Section snippets
Apparatus and procedure
Experimental VLE data were measured in an all-glass circulation still chargeable with 150 ml of liquid phase. Essentially, it was the generic Dvořák–Boublík type used in our previous research (e.g. [7]). Pressure was measured indirectly via the boiling point of water in an ebulliometer connected in parallel to the still; the uncertainty was ±0.1% of the measured value. The equilibrium temperature was determined with a digital thermometer F250 (ASL, United Kingdom) calibrated against a
Results
Table 3 shows direct experimental x–y–P values together with the activity coefficients, γ1, γ2, and ΔGE (evaluated from the NRTL correlation) for the binary systems. All three binary systems are zeotropic. The data were correlated using the Wilson and NRTL equations in the following forms (expressions for ln γ2 can be easily obtained after interchanging indices 1 and 2):
- (1)
The Wilson equationwhere A12 = (V1/V2) exp[− (λ12 − λ11)/RT], A21 = (V2/V1) exp[− (λ21 − λ22)/
Discussion and conclusions
We have found no vapour–liquid equilibrium data for the studied systems in the bibliography covering the period 1888–2007 [17] and in the Web of Knowledge since 2008 to be able to compare them. However, we believe that the obtained standard deviations in our calculations, which are approximately proportional to the magnitudes of input uncertainties sufficiently verify the reliability of both the data and the correlation procedure. The distribution of deviations from the smoothed data confirms
Acknowledgements
The authors wish to acknowledge technical assistance of Ms S. Bernatová and a partial support of the Institute of Chemical Process Fundamentals (internal project).
References (18)
ELDATA: Int. Electron. J. Phys.-Chem. Data
(1999)- et al.
Fluid Phase Equilib.
(2001) - et al.
Fluid Phase Equilib.
(2001) - et al.
Fluid Phase Equilib.
(2004) - et al.
Fluid Phase Equilib.
(2005) - et al.
J. Chem. Eng. Data
(2005) - et al.
Fluid Phase Equilib.
(2008) - et al.
Fluid Phase Equilib.
(2009) - et al.
Fluid Phase Equilib.
(2011)