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HomeAuthorsFriedman, Y. Z.

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?

Hydrocarbon Processing / January 2005
Petrocontrol: Friedman, Y. Z.
Process Control

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

Hydrocarbon Processing / March 2003
Petrocontrol: Friedman, Y. Z.
Process Control

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

Hydrocarbon Processing / March 2003
Petrocontrol: Friedman, Y. Z.  |  Schuler, M.
Process Control

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

First-principles distillation inference models for product quality prediction

Hydrocarbon Processing / February 2002
Petrocontrol: Friedman, Y. Z.
Petrobras: Neto, E. A.  |  Porfirio, C. R.
Environment & Safety / Refining / Gasoline

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

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

Hydrocarbon Processing / January 2000
Petrocontrol: Friedman, Y. Z.
Process Control

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

Hydrocarbon Processing / August 1998
Petrocontrol: Friedman, Y. Z.
Process Control

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

Hydrocarbon Processing / February 1997
Petrocontrol: Friedman, Y. Z.
Process Control

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..