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| Modello PFR× | UNIFAC× | |
|---|---|---|
| Campo | Fisica applicata | Fisica applicata |
| Famiglia | Process / pipeline | Process / pipeline |
| Anno di origine≠ | 1962 | 1975 |
| Ideatore≠ | Octave Levenspiel | Aage Fredenslund, Russell Jones, John Prausnitz |
| Tipo≠ | Mathematical model for plug-flow reactor | Activity coefficient model; predictive liquid-phase property method |
| Fonte seminale≠ | Levenspiel, O. (1999). Chemical Reaction Engineering (3rd ed.). John Wiley & Sons. ISBN: 978-0-471-25424-9 | Fredenslund, A., Jones, R. L., & Prausnitz, J. M. (1975). Group-contribution estimation of activity coefficients in nonideal liquid mixtures. AIChE Journal, 21(6), 1086-1099. DOI ↗ |
| Alias≠ | ideal tubular reactor, plug-flow model, PFR | UNIFAC predictive model, UNIQUAC functional-group contribution |
| Correlati | 3 | 3 |
| Sintesi≠ | The PFR (Plug Flow Reactor) model describes the behavior of a tubular reactor in which fluid elements move through as distinct plugs with no axial mixing. Fluid at the inlet is freshly unreacted; as it travels downstream, reactions progress. This idealized model, formalized by Octave Levenspiel alongside CSTR theory, is the opposite extreme: while CSTRs are fully mixed, PFRs have no axial mixing. In practice, PFRs achieve higher conversion than CSTRs for the same residence time and are widely used in the chemical and petroleum industries. | UNIFAC (Universal Functional-group Activity Coefficient) is a predictive model for liquid-phase activity coefficients of multicomponent mixtures. Developed by Fredenslund, Jones, and Prausnitz in 1975, it decomposes molecules into functional groups and uses group interaction parameters to estimate non-ideal behavior. UNIFAC is revolutionary because it can predict phase equilibria for mixtures never experimentally measured, making it invaluable for process design and chemical engineering. |
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