The equilibrium and dynamics of low concentrations of benzene, toluene, and xylene in heptane adsorbed by zeolite NaY at 30, 40, and 50 degrees C were studied. The Langmuir equation was suggested to simulate the isotherms. Based on isotherms and material balances, multi-component competitive adsorption isotherms can be successfully predicted by mono-component adsorption isotherm parameters. A series of column adsorption experiments were conducted to study the adsorption dynamics. The mass transfer equations were solved by numerical analysis and used to describe the breakthrough curves, and the mass transfer coefficients in the adsorption column were obtained as well.