Substituted phenols are an important class of compounds having widespread use (germicides, disinfectants, ingredients in fuel, etc.). In this work, the solubilities of selected substituted phenols (2,5-dimethylphenol, 2,4,6-trimethylphenol,2,3,5-trimethylphenol, 4-phenylphenol, 4-tertbutylphenol) in binary (single solute + SCF CO2) and ternary (two solutes + SCF CO2) systems were investigated using a SFT Phase Monitor.