High-pressure vapor + liquid equilibria for the binary system CO2 + (E)-2-hexenal

Research output: Contribution to journalArticlepeer-review

Abstract

The isothermal vapor + liquid equilibria of carbon dioxide + (E)-2-hexenal (a key apple aroma) wasmeasured using a visual equilibrium cell with an analytic methodology. The selected isotherms were(313.2, 323.2 and 333.2) K, and the pressures assessed ranged from (2.2–9.8) MPa. The thermodynamicconsistency of the experimental data was verified, and the uncertainties of the molar fractions of thevapor and liquid phases were estimated. The density and dynamic viscosity of pure (E)-2-hexenal weremeasured at 101.13 kPa and temperatures from (292.2–353.2) K. Two equations of state were selected tomodel the vapor + liquid equilibria. The Peng-Robinson with two different mixing rules, and the PerturbedChain - Statistical Associating Fluid Theory. The phase envelopes showed a critical pressure, detected atcarbon dioxide molar fractions ≥ 95 % mol·mol−1

Bibliographical metadata

Original languageEnglish
Article number105027
JournalThe Journal of Supercritical Fluids
Volume168
Early online date14 Oct 2020
DOIs
Publication statusPublished - 1 Feb 2021