c28420-lecture3-2009 - Course 28420 Lecture Course 28420...

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ourse 28420: Lecture 3 Course 28420: Lecture 3 Graphical Design – I: Vapor(gas) –liquid separations Topics related to equilibrium stage, graphical i d bi di till ti ith t t design and binary distillation with respect to Vapor (gas)-Liquid separation will be covered from parts of chapters 4, 6 & 7. Chapter 3, sections 6.7-6.9 and 7.5 (rate-based models) will be covered in lecture 9 28420: Separation Process Principles - Lecture 3 (2009) 1
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Graphical Design of Vapor-Liquid Separation Systems Represent the separation process and its operation in 2- or 3- imensional figures and perform design/analysis calculations on dimensional figures and perform design/analysis calculations on the figure elect variables (2 or 3) to be used as axes for the figures Select variables (2 or 3) to be used as axes for the figures Derive relationships between the selected variables from mass and/or energy balance of the process (provides operational characteristics) – related to operation of the uipment equipment Derive relationships between the selected variables from the henomena defining the separation task (for example apor phenomena defining the separation task (for example, vapor- liquid equilibrium relationship) – related to the phase behaviour of the chemical system 28420: Separation Process Principles - Lecture 3 (2009) 2 y
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Graphical Design of Vapor-Liquid Separation Systems Represent the separation process and its operation in 2- or 3- dimensional figures and perform design/analysis calculations on the figure: Example elect - or 3 variables to be used as axes for the figures Select 2 or 3 variables to be used as axes for the figures (choose from T, P, x , y ) erive relationships between the selected variables from Derive relationships between the selected variables from mass and/or energy balance of the process (provides operational characteristics) – define relationships between and design variables (L, V/F, …) erive relationships between the selected variables from the Derive relationships between the selected variables from the phenomena defining the separation task (for example, vapor- liquid equilibrium relationship) 28420: Separation Process Principles - Lecture 3 (2009) 3
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Concept of an equilibrium stage: vapour-liquid system Vapor, V P Feed, Z Liquid, L T, P Typical 2-Phase VLE-Model quilibrium relation sat sat ) = y V i = 1,2,….c Equilibrium relation x i i i P i (T) y i i P 1,2,….c Condition i x i = i y i = i z i = 1 Mass Balance Z z = V y + L x i = 1,2,….c i i i Derivation of equilibrium & operating relations Equilibrium relation y i = x i i i sat P i sat (T) /( i V P ) i = 1,2,….c 28420: Separation Process Principles - Lecture 3 (2009) 4 Mass Balance y i = - x i (L/V) + z i (V+L)/V i = 1,2,….c
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Concept of a driving force: vapour-liquid system Vapor, V P Feed, Z Liquid, L T, P * Define driving force, D ij , as D ij = y i –x i for any binary system of mpounds i & j compounds i & j * Subtract x i from both sides of the equilibrium and mass balance equations Equilibrium relation D ij = x i ( i i sat P i sat (T) /( i V P ) - 1) (Eq.1) ass Balance =- /V + 1) + z +L)/V (Eq 3)
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This note was uploaded on 11/20/2009 for the course CHME DTU-abroad taught by Professor Rafiqulgani during the Fall '09 term at Rensselaer Polytechnic Institute.

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c28420-lecture3-2009 - Course 28420 Lecture Course 28420...

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