An experimental flow-type apparatus has been designed to obtain solubility data for an anthracene, phenanthrene, and carbazole mixture in supercritical carbon dioxide. The equilibrium solubilities were measured at 308.2 K, over a pressure range of (111 to 201) bar. The equilibrium cell was tightly packed with a uniform mixture of solute and glass beads with 27 layers of glass wool and sieve trays. In this method, the solvent flow is completely dispersed through solid solute and channeling, formation of dead volume, and caking of the solid during operation of the system are prevented. The measured solubilities for binary and quarternary systems were correlated using the SRK EOS with van der Waals mixing rules, using binary interaction parameters for both cases. The calculated results indicated good agreement with the experimental data. The results of one-step extraction of main components of anthracene oil (phenanthrene, anthracene and carbazole) of Isfahan Coal Tar Refining Co. in supercritical carbon dioxide at 308.2 K and 201 bar are also presented.