Substituted phenols are an important class of compounds having widespread use (germicides, disinfectants, ingredients in fuel, etc.) There is little information in the literature regarding the solubilities of phenols in SCF CO2. Accurate and precise solubility data for the compounds of interest is essential for the design of any SCF-based process. 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.