High-pressure (vapor + liquid) equilibria for binary systems containing carbon dioxide and key apple odorants, hexanal and ethyl-2-methylbutyrate

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

“…The current state of the available data indicates that there is a need for new and complementary experimental information for high-pressure VLE, and pure component properties. This contribution is a continuation of the work reported by López-Porfiri et al, [9] as well as other works available in the literature [8,[10][11][12]. However, specific data of the high-pressure VLE for CO2 and (E)-2-hexenal has not been previously reported in the literature.…”

“…The experimental design and procedure used to measure the isothermal high-pressure vapor + liquid equilibria of the binary system CO2 + (E)-2-hexenal were previously described in detail by López-Porfiri et al [9], and Bejarano et al [11]. The temperatures and pressures measured were up to 333.2 K and 10 MPa constrained by the equipment limits and data requirements.…”

“…The standard uncertainties of temperature (u(T) = 0.1 K) and (pressure u(p) = 0.01 MPa), as well as the combined expanded uncertainty of the CO2 (1) mole fractions in vapor (UComb(y1)) and liquid (UComb(x1)) phases were estimated according to the definitions of Chirico et al [14]. Specifically, UComb(y1) was estimated using the method proposed by Miller and Miller [15], and UComb(x1) was calculated from the information available for the experimental methodology and measured data [9]. For both uncertainties, a confidence level of 95.45 % was selected, which meant a coverage factor of 2 [9,14].…”

“…In order to design and optimize a process for the recovery of key volatile organic compounds using SC-CO2, the main constraints are defined by the thermodynamic phase equilibria information. Specifically, experimental data as well as models that relate the temperature, pressure, and the mole fraction of the water-rich (liquid, xi) and CO2-rich (vapor, yi) phases at high-pressure equilibrium conditions are required [9]. In addition, pure physicochemical properties of key aroma components such as vapor pressure p 2 Vap ( ) [10], density (i) and dynamic viscosity (i) are also needed for a better understanding and modeling of the hydrodynamics process and mass transfer.…”

“…López-Porfiri et al, [9] analyzed the data of high-pressure vapor + liquid equilibria (VLE) available in the literature regarding systems containing aroma components and CO2. The literature suggests that the information could be organized into two main groups.…”