Continuous counter-current liquid-liquid extraction of copper from an acidic aqueous solution is performed in a 6m pulsed packed column. Bubbles of an immiscible organic phase, containing the complexing agent LIX 64N, move upward as the continuous aqueous phase moves downward. It is desired to regulate the residual copper content of the departing aqueous phase, using as control actions the organic feed rate and the pulse frequency. In this distributed system, profiles of copper concentration become imprinted on the descending aqueous phase as a result of the history of controls and disturbances acting during the passage of a parcel. Initial work has involved the development of a dynamic model of the extractor, and the proving of a constrained model predictive controller on this model. The model is based on a spectral solution along the discretised column length, with special treatments of convection and the boundary conditions. The Linear Dynamic Matrix Controller (LDMC) minimises the summed magnitudes of deviation from setpoint, over a time horizon of up to 50 steps. The algorithm used is based on the method of Chang and Seborg (1983).
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