One of my clients has a dozen or so distillation multi-variable predictive control (MVPC) applications, implemented by one of the major advanced process control (APC) vendors. These applications have ..
One of my clients has a dozen or so distillation multi-variable predictive control (MVPC) applications, implemented by one of the major advanced process control (APC) vendors. These applications have not been successful. A substantial investment is at risk, and I was asked to investigate what could be done to repair these controllers. The result of this investigation was not what my client wanted to hear. I have seen and written about many APC failures, but it is unusual to come across APC designs that, even if successful in stabilizing the unit, would run worse than the distributed control system (DCS) strategies they are replacing. Let's look at one of the designs – deisopentanizer (D
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