Aromatics extraction was studied using aqueous solution of sulfolane as the solvent phase and model gasoline, consisting of a BTX and hexane mixture, and reformate gasoline as the feed phase. The distribution coefficients and selectivities of benzene were the highest, followed by those of toluene and xylene. Increased water content of the solvent phase reduced the distribution coefficients and increased the selectivities. The separation selectivities for aromatics were high enough to expect good separation performances. The behaviors of hexane were estimated as higher than the experimental results and one of the parameters was adjusted to predict the extraction equilibrium data of hydrocarbons. However the behaviors of water and sulfolane could not be fully estimated and the estimation was limited in usefulness for the analysis of the extraction rates of hydrocarbons. The mass transfer resistance in the continuous phase was larger than that in the dispersed phase, and was the controlling factor in the overall mass transfer resistance. These findings should be valuable for the design of the aromatic recovery process.