Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back Model-Based Optimization of Feedstock Allocation in a Multicomponent Distillation Column V.S. KUDRYASHOV, I.A. KOZENKO, M.V. ALEKSEEV, A.V. IVANOV, A.YU. SHINKARENKO The article addresses the optimization problem of redistributing the feedstock flow to the feed trays of a distillation column when the composition of the initial mixture changes, aiming to enhance the separation efficiency of a multicomponent mixture in ethylbenzene production. The optimization problem is solved using the criterion of minimizing the loss of key separation components, employing a mathematical model based on the column’s material balance equations, contact stage equations, and vapor-liquid equilibrium equations. An optimization algorithm for control parameters (refl ux flow rate, reboiler temperature) and feedstock redistribution among the feed trays is proposed, utilizing a gradient-based method. It is demonstrated that optimal feedstock redistribution significantly minimizes the loss of key components and stabilizes the process when the composition of the initial mixture varies. Keywords: distillation, optimization, mathematical model, multicomponent mixture, ethylbenzene, tray column, gradient method, optimal distribution, temperature profile. DOI: 10.25791/pribor.9.2025.1615 Pp. 42-51.