title: GOBF-ARMA based model predictive control for an ideal reactive distillation column.
abstract: This paper discusses the control of an ideal reactive distillation column (RDC) using model predictive control (MPC) based on a combination of deterministic generalized orthonormal basis filter (GOBF) and stochastic autoregressive moving average (ARMA) models. Reactive distillation (RD) integrates reaction and distillation in a single process resulting in process and energy integration promoting green chemistry principles. Improved selectivity of products, increased conversion, better utilization and control of reaction heat, scope for difficult separations and the avoidance of azeotropes are some of the advantages that reactive distillation offers over conventional technique of distillation column after reactor. The introduction of an in situ separation in the reaction zone leads to complex interactions between vapor-liquid equilibrium, mass transfer rates, diffusion and chemical kinetics. RD with its high order and nonlinear dynamics, and multiple steady states is a good candidate for testing and verification of new control schemes. Here a combination of GOBF-ARMA models is used to catch and represent the dynamics of the RDC. This GOBF-ARMA model is then used to design an MPC scheme for the control of product purity of RDC under different operating constraints and conditions. The performance of proposed modeling and control using GOBF-ARMA based MPC is simulated and analyzed. The proposed controller is found to perform satisfactorily for reference tracking and disturbance rejection in RDC.
authors.affiliation: Control & Industrial Automation Research Group, National Institute of Technology Silchar, Assam 788010, India. Electronic address: seban@ei.nits.ac.in.
authors.forename: Lalu
authors.initials: L
authors.lastname: Seban
authors.affiliation: Department of Chemical Engineering, National Institute of Technology Tiruchirappalli, Tamil Nadu 620015, India.
authors.forename: V
authors.initials: V
authors.lastname: Kirubakaran
authors.affiliation: Control & Industrial Automation Research Group, National Institute of Technology Silchar, Assam 788010, India.
authors.forename: B K
authors.initials: BK
authors.lastname: Roy
authors.affiliation: Department of Chemical Engineering, National Institute of Technology Tiruchirappalli, Tamil Nadu 620015, India.
authors.forename: T K
authors.initials: TK
authors.lastname: Radhakrishnan
mesh_terms: D057168:Distillation; D006358:Hot Temperature; D008962:Models, Theoretical; D017711:Nonlinear Dynamics
keywords: Generalized orthonormal basis filter – auto regressive moving average model; Model predictive control; Process and energy integration; Reactive distillation column