Zhang et al. [1] presented a prediction of phase equilibria in the CO2-C2H5OH-H2O system at 308-338 K and 10-17 MPa using a SAFT equation of state (EOS) with pure-component parameters fitted to pure-component properties and binary interaction parameters fitted to equilibria of the binary subsystems in the same temperature range. Zhang et al. conclude that "compared with the earlier works by different authors, for the ternary system CO2-C2H5OH-H2O, the SAFT EOS seems to be the best both for correlation and for prediction". This letter comments on (1) the introduction, (2) the description of SAFT, (3) the fitting procedure for pure-component parameters, (4) the correlation of binary equilibria, (5) the prediction of ternary equilibria, and (6) the conclusions of the original paper.