השוואת שיטות

	UNIFAC	ניתוח צבת	זיקוק ריאקטיבי
תחום	פיזיקה יישומית	פיזיקה יישומית	פיזיקה יישומית
משפחה	Process / pipeline	Process / pipeline	Process / pipeline
שנת המקור	1975	1978	1995
הוגה השיטה	Aage Fredenslund, Russell Jones, John Prausnitz	Bodo Linnhoff, John Flower	Klaus Sundmacher
סוג	Activity coefficient model; predictive liquid-phase property method	Thermal design and optimization method	Integrated reaction-separation process model
מקור מכונן	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.	Linnhoff, B., & Flower, J. R. (1978). Synthesis of heat exchanger networks: I. Systematic generation of energy optimal networks. AIChE Journal, 24(4), 633-642.	Sundmacher, K., & Kienle, A. (2003). Reactive Distillation: Status and Future Directions. Wiley-VCH. ISBN: 978-3-527-30623-9
כינויים	UNIFAC predictive model, UNIQUAC functional-group contribution	heat integration, pinch point method, process integration	integrated distillation-reaction, reactive column, reaction with separation
קשורות	3	4	4
תקציר	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.	Pinch analysis is a systematic method for identifying the minimum energy requirements and optimal heat recovery opportunities in chemical processes. Developed by Bodo Linnhoff and John Flower in 1978, it graphically identifies the 'pinch point'—the most constrained part of the process where heating and cooling demands nearly balance. By targeting these bottlenecks, engineers can design energy-efficient heat exchanger networks and reduce operating costs dramatically.	Reactive distillation couples reaction and separation in a single column, where reactants are separated from products continuously while simultaneously undergoing reaction on catalytic trays. Pioneered in the 1990s by Klaus Sundmacher and others, this process intensification technique dramatically reduces capital cost, energy consumption, and environmental impact for suitable reactions. It is now industrially proven for esterification, hydration, and transesterification processes.