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PID and Sliding Mode Control for a Reactor-Separator-Recycler System: A Regulatory Controllers’ Comparison

Abstract:

One of the most common methods to obtain propylene glycol (PG) is using a Re-actor-Separator-Recycle (RSR) system. The control of temperature and reagent concentration during the process operation are essentials for the optimal performance of this chemical process. Those variables are regulated using control techniques to maintain the process in the operating points in the presence of disturbance. However, the nonlinear behavior of the process limits the range of operating point using classical controls, being robust control an alternative for nonlinear processes. Here, the performance of classical and robust control techniques in the presence of disturbance in the mixing point is simulated in an RSR system to obtain PG. The results show through of the Integral Square Error (ISE) index that robust control techniques have better efficiency and soft control action than classical techniques when a stronger disturbance is applied.