Application of SMB adsorption dynamic mixing cell model in the simulation system of PX unit

On the basis of process analysis, a dynamic mixing cell model of simulated moving bed (SMB) adsorption process of C₈ aromatics was developed. The model assumed an equivalent counter-current movement of the solid phase, and the mass transfer between fluid and particle was described by the linear driving force model. Together with other unit models, it was applied to the simulation system of PX industrial unit for operator training. The study indicates that this model is convenient and accurate for simulating the dynamic state of the SMB system.