PID Control of a Chemical Absorption Process

In this paper, a solution for the control of a chemical absorption process of a gas in liquid phase is proposed. The absorption process is treated as a distributed parameter one, its model being expressed using partial differential equations. The parameters of process model are experimentally determined. Also, the control strategy is based on using a modified PID controller with the form adapted to the treated application. The numerical simulation of the control structure is made using the matrix of partial derivatives of the state vector (Mpdx) method associated with Taylor series and approximating analytical solutions. Some interesting simulations are presented in order to highlight both the control system and the numerical simulation performances.