Vapor–Liquid Equilibria Measurements for Di-n-Propyl Ether and Butyl Ethyl Ether with n-Heptane

Abstract

Isobaric vapor−liquid equilibrium (VLE) data were measured for two binary systems comprising n-heptane with one of di-n-propyl ether (DNPE) or butyl ethyl ether (BEE) at 60 kPa. Slight positive deviations from ideality were apparent in both systems, but not so strong as to result in azeotropic behavior. The data for both systems were shown to be thermodynamically consistent using both the Wisniak L/W and McDermott-Ellis consistency tests. Data were further well correlated by the nonrandom twoliquid (NRTL) activity coefficient model and fairly predicted using the Dortmund-modified UNIFAC model. The data presented serve to fill the gap in the literature for data sets of structural isomers of C 6 ethers with n-heptane, where data for the linear isomers are absent. This data, combined with that available for the branched isomers, serve to highlight the role of polar functional group location on associated mixture behavior in such systems.

Isobaric Vapor–Liquid Equilibria Measurements and Thermodynamic Modeling for the Systems Containing 2-Butanone, C3 Alcohols, and C4 Esters: Part I─Binary Mixtures

“…Fundamentally addressing the shortcomings of EoSs is thus systematically hindered by the resulting gaps in the experimental literature that would otherwise establish trends in behavior with component properties like size, homologous series, and functional group location, among others. As with the previous work performed by our group in methodically generating phase equilibrium data for ketone/alkane, ester/alkane, and ether/alkane mixtures, − the experimental investigation presented here systematically measured isobaric vapor–liquid equilibrium (VLE) data for the nine possible binary mixtures indicated in Figure . Reproducing previous measurements, where this existed, served as a verification of the accuracy and procedure before generating new data.…”

Isobaric Vapor–Liquid Equilibria Measurements and Thermodynamic Modeling for the Systems Containing 2-Butanone, C3 Alcohols, and C4 Esters. Part II: Ternary Mixtures

“…The purpose of the current work then is, first, to contribute to the systematic population of unmeasured multicomponent equilibrium dataconsidering ternary mixtures of the same components present in the nine binary mixtures of Part I . The focus is on systems exhibiting dipolar interactions, association, solvation, and isomerism in line with our previous works. − Thereafter, the implicit assumptions highlighted are tested by comparing the model predictions, using published model parameter sets, to the measured data.…”