November 2008

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HP Control: Where do you take those inferential models from?

Charts shown in my editorials, illustrating the performance of select first-principles models, have attracted much e-mail feedback. While mostly positive, some question why the editorials do not provi..

Friedman, Y. Z., Petrocontrol

Charts shown in my editorials, illustrating the performance of select first-principles models, have attracted much e-mail feedback. While mostly positive, some question why the editorials do not provide detail about the principles behind the models. I was taken aback by that criticism because of the distillation inferential models I use: Generalized cutpoint calculations (GCCs) and generalized distillation shortcut (GDS) are well documented in the public literature. Of the reactor models I use, reformer severity (REFS) and visbreaker (VISBS) models are also documented, though not as well. Where is this perception coming from? HP demands that editorials not be specific in terms of model nam

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