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Abstract
Material balance control is compared to conventional control via the use of dynamic distillation column simulations. The objective is to achieve dual composition control. Three towers ranging in purity and reflux ratio are considered. It is shown that material balance control is best for towers with the highest purities and reflux ratios. For towers with lower product purities and more moderate reflux ratios conventional control is better. The effect of the size of the analyser dead-time in determining which control strategy works best is also studied. The question of how to tune a material balance scheme as well as potential problems with the non material balance loop in such a scheme are treated.
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