Isothermal vapour–liquid equilibria in the binary and ternary systems composed of 2-propanol, 3-methyl-2-butanone and 2,2,4-trimethylpentane
Introduction
New results of a continuing project dealing with phase equilibria in mixtures belonging to distinct families of organic compounds are reported in this paper. Vapour–liquid equilibria are determined for two binary and one ternary systems containing alcohol, ketone, and hydrocarbon. Within the series of papers, the systems of components having a common alkyl group (isopropyl), namely 2-propanol + diisopropyl ether + 2,2,4-trimethylpentane [1], 2-propanol + diisopropyl ether + 1-methoxy-2-propanol [2], 2-propanol + diisopropyl ether + 4-methyl-2-pentanone [3], and 2-methylpentane + 3-methyl-2-butanone + 3-methyl-2-butanol [4] have already been investigated. Compounds used in this paper contain also the ketone, alcohol or isopropyl groups: 2-propanol, 3-methyl-2-butanone, and 2,2,4-trimethylpentane. The new data were measured at the two constant temperature levels, particularly at 330.00 and 340.00 K, in order to be consistent with all the previous papers.
Section snippets
Apparatus and procedure
Experimental vapour–liquid equilibrium data were measured in an all glass circulation still chargeable with 150 ml of liquid-phase; essentially it was the Dvorak–Boublík type with modifications described in detail elsewhere [5]. The pressure was measured indirectly via the boiling point of water in an ebulliometer connected in parallel to the still; the uncertainty is ±0.1% of the measured value. The equilibrium temperature was determined with the digital thermometer S1220 (Systemteknik, Sweden)
Results
The direct experimental x–y–P values together with the activity coefficients, γ1 and γ2, (evaluated from the NRTL correlation) for the binary systems are given in Table 1. The data were correlated using the Wilson, NRTL, and the fourth order Redlich–Kister equation in the forms as follows (expressions for ln γ2 can be easily obtained after interchanging indices 1 and 2):
- (1)
The Wilson equation
where A12 = (V1/V2)exp[−(λ12 − λ12)/RT], A21 = (V2/V1)exp[−(λ21 − λ22)/
Discussion and conclusions
No published vapour–liquid equilibrium data for the systems containing 3-methyl-2-butanone were found in the bibliography covering the period 1888–2006 [15]. Five sets of existing data are available for 2-propanol + 2,2,4-trimethylpentane, however, they are measured at isobaric conditions (at atmospheric pressure) or on different isotherms so that they cannot be exploited for comparison. Nevertheless, the reliability of both the data and correlation procedure is verified by the fact that the
Acknowledgement
The authors acknowledge the partial support of the Grant Agency of the Czech Republic (Grant No. 104/07/0444).
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