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High-pressure phase equilibria of liquid CO2 with ethanol - water mixtures
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DOI：10.1016/j.fluid.2025.114450.png)
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Abstract
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Although many data have been reported for the CO2 (1) - ethanol (2) - water (3) system, gaps in the literature exist for liquid CO2 at conditions where stripping of ethanol for flavor fractionation has been suggested. In this work, a flow-type device was used to measure the phase equilibria of CO2 - ethanol - water mixtures at (278 to 298) K and (8 to 20) MPa. Ethanol/water feed ratios were varied from 0.22 to 1.7 which gave corresponding equilibrium ratios (=yi/xi) of K1 (39 to 4), K2 (0.12 to 0.21) and K3 (0.006 to 0.04) giving ethanol/water selectivities, beta (=K2/K3), that ranged from 27.9 to 5. While the K2 values tended to be invariant with ethanol/water feed ratio, the K1 and K3 values varied greatly. Among the equations of state evaluated in this work, the PengRobinson equation of state with the Wong-Sandler mixing rule model based on the NRTL activity coefficient expression gave the lowest deviations and could correlate K values for CO2, ethanol and water with an average relative deviation of 6.9 %, 22.3 % and 28.1 %, respectively.
Keywords:
Equations of state
Vapor-liquid equilibrium
High pressure systems
Extraction and separation
Flow measurements
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