c28420-lecture8-2009 - SEPARATION PROCESSES...

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SEPARATION PROCESSES PRINCIPLES (28240) LECTURE 8 Rate-based Models for distillation columns; Short path evaporation columns; Short-path evaporation model & reactive distillation model
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Rate-based models for distillation The methods presented in Chapters 10 and 11 assumed that equilibrium is achieved at each stage, with respect to heat and mass transfer. However, in most industrial applications (or real processes), the equilibrium is never reached. The Rate-Based Model is an alternative to equilibrium based d l h th d b l d l d models, where the mass and energy balances are developed separately for each phase around a stage. A stage can be a tray a collection of trays or a segment of a packed section tray, a collection of trays, or a segment of a packed section.
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Rate-based models for distillation Model Objective Model Development Develop a general model for a vapor-liquid separator (staged column) operating at steady state. Model assumptions 1. There is equilibrium between vapor-liquid only at the interface 2. No chemical reactions occur 3. Entrainment of liquid drops in vapor and occlusion of vapor in liquid are negligible. 4. Vertical column with countercurrent flow 5. Continuous operation
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