Friedman, Y. Z.

Petrocontrol, New York, New York

Y. Zak Friedman is a Principal Consultant with Petrocontrol. He has practiced APC for most of his career, specializing in using first-principles models for inferential process control and has developed inferential models to fit many hydrocarbon processes. Dr. Friedman’s experience spans more than 50 yr, working with Exxon Research and Engineering, KBC Advanced Technology and Petrocontrol. He holds a PhD degree from Purdue University.

HP Control: Has the advanced process control industry completely collapsed?

Friedman, Y. Z., Petrocontrol

I stopped writing   editorials for a while because people were uncomfortable reading them. But I have finally decided against burying my head in sand. We ? control engineers ? should discu..

HP Control: APC, modeling and optimization insights

Friedman, Y. Z., Petrocontrol

I have participated in the National Petrochemical and Refiners Association (NPRA) computer conference without fail for over a decade, and have seen it go through the ebb and flow of oil..

First-principles inference model improves deisobutanizer column control

Friedman, Y. Z., Schuler, M., Petrocontrol

When the input data are clean, model fidelity is better than that of onstream analyzers

First-principles distillation inference models for product quality prediction

Friedman, Y. Z., Petrocontrol; Neto, E. A., Porfirio, C. R., Petrobras

Modeling approach involves a short-cut simulation of a column section

HP Control: Closed-loop optimization update – a step closer to fulfilling the dream

Friedman, Y. Z., Petrocontrol

Closed-loop economic optimization of refineries and chemical units has been a dream in our industry for over four decades. There have been at least three waves of attack on this problem, but optimizat..

More about closed-loop optimization

Friedman, Y. Z., Petrocontrol

Editor's note: In the March '98 "HP In Control" editorial1, I named several controversial issues and requested readers' input. Dr. Friedman is responding to per..

HP Control: Advanced process control: it takes effort to make it work

Friedman, Y. Z., Petrocontrol

Conventional wisdom has it that investments in advanced process control pay out in weeks. Pour in the money, and things will begin to happen. Years of work as an advanced control consultant have taugh..