Vapor‐liquid equilibrium: Part IV. Reduction of P‐x data for ternary systems

Abstract

Total pressure measurements taken for the ternary systems acetonechloroform-methanol and chloroform-ethanol-n-heptane at 5OoC are reduced by Barker's method and correlated by an equation similar to one proposed by Wohl (1953 SCOPEThe apparatus of Gibbs and Van Ness (1972) has been adapted to P-x measurements for ternary Systems. Extensive data on the acetone-chloroform-methanol and chloroform-ethanol-n-heptane systems at 5OoC are reported. Data reduction by Barker's method yields analytical expressions for the composition dependence of the excess Gibbs function for these systems. Through use of a general expression for GE similar to one proposed by Wohl (1953), the precise expressions for binary systems discussed by Abbott and Van Ness (1974) in Part 111 are introduced into the equation for ternary systems, and all of the advantages of Barker's method are cxkmded directly to ternary systems. CONCLUSIONS AND SIGNIFICANCEParts I, 11, and I11 of this series of papers have dealt with vapor-liquid equilibrium in binary systems and have tions based on just P-x data. The possible methods of data reduction have been detailed, and the focus of attention has ultimately fallen on Barker's method, a one-step procedure that requires an analytical expression for GE that is capable of reproducing the P-x relation within experimental accuracy. The advantages attending Barker's simple and direct.method for binary systems are of greater significance for muhicomponent systems because the alternative methods more complex. The extension of Barker's method to multicomponent systems requires nothing more than an appropriate analytical expression for G~. Having demonstrated in Part 111 the practicality of the method for highly nonideal binary systems, we here show that the extension to ternary systems is not only feasible, but demonstrated the reliability and advantages of conelaOf data reduction techniques becomeThe apparatus for vapor-liquid equilibrium determination from total pressure measurements described by Gibbs and Van Ness (1972) has been modified by the addition of a third degassing chamber and piston injector so that data may be taken for ternary systems. We report here results for the systems acetone-chloroform-methanol and chloroform-ethanol-n-heptane at 50°C. Data for the six constituent binaries, also for 50"C, were given by Abbott and Van Ness (1974) in Part I11 of this series of papers. The acetone, chloroform, and methanol were chromatoquality reagents supplied by Matheson, Coleman, and Bell; the n-heptane was the pure grade of Phillips Petroleum Company; the reagent-quality ethanol came from U. S.Industrial Chemicals. Except for degassing, all reagents were used as received with a minimum indicated purity of 99.8 mole %.For the acetone-chloroform-methanol system the raw data for ternary mixtures consist of 164 sets of P, XI, x2, x3values: 98 such sets are reported for the chloroform-ethanol-n-heptane system. * TREATMENT OF DATAData reduction by Barker's methocl (Barker, 1953) is accomplished through use of an ...

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“…(16)(17)(18) The data reduction of the binary and ternary mixtures has been performed using Barker's method (19) according to well established procedures. (20,21) …”

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