The extraction of water soluble organic material from aqueous phases by supercritical fluids is considered to be of increasing interest in separation technology. The present work presents experimental results for the high-pressure phase equilibrium of the quaternary systems carbon dioxide + water + acetic acid + sodium chloride and carbon dioxide + water + acetic acid + sodium acetate for temperatures from (313 to 353) K and pressures between (6 and 16) MPa. The molality of the salts was varied between (0.3 and 1.5) mol/kg for sodium chloride and between (0.5 and 3) mol/kg for sodium acetate, respectively. The investigations were performed with an experimental arrangement based on the continuous flow technique. Both salts show a distinguished influence on the composition of the coexisting phases when compared to the salt-free system carbon dioxide + water + acetic acid, as they reveal "salting-out" and "salting-in" effects on acetic acid.