Abstract: The adsorption and separation performance of C8 aromatics and the desorbent p-diethylbenzene on BaX zeolite were investigated. Static adsorption experiments were conducted to determine the adsorption equilibrium parameters of each component, including the saturation adsorption capacity, adsorption equilibrium constant, and isosteric heat of adsorption obtained by fitting the adsorption isotherms, as well as the relative selectivity coefficients derived from competitive adsorption. The effects of temperature and concentration on these parameters were analyzed, and the adsorbent with better performance was identified. Under 177.0 °C and 0.9 MPa, its saturation adsorption capacity for p-xylene reached 1.290 mol/kg. Dynamic pulse experiments were further carried out to obtain the elution curves of C8 aromatic isomers. The experimental curves were fitted using the gPROMS simulation software, and the mass transfer coefficients of all components were calculated to be around 2.5×10⁻⁵ m/s. Multicomponent pulse experiments were then performed using an industrially representative C8 aromatic mixture to validate the adsorption process parameters. The results showed good agreement between the experimental and simulated curves, demonstrating the reliability of the obtained adsorption equilibrium and mass transfer parameters.