Mass Transfer Operations I
Mass Transfer Operations I CHE 545
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This 1 page Class Notes was uploaded by Jazlyn Schultz III on Friday October 23, 2015. The Class Notes belongs to CHE 545 at University of Idaho taught by Vivek Utgikar in Fall. Since its upload, it has received 24 views. For similar materials see /class/227844/che-545-university-of-idaho in Chemical Engineering at University of Idaho.
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Date Created: 10/23/15
Fall 2008 ChE 545 Mass Transfer Operations I Lecture 7 lESH Equations and Batch Distillation A countercurrent cascade of several equilibrium stages each with a feed vapor and liquid in uents from adjacent stages vapor and liquid ef uent streams with side product draws and an energy transfer arrangement can be modeled through a system of equations These MESH equations arise out of Material balances Equilibrium considerations mole fraction Summations and enthalpy H balance The number of equations for an N stage C component systems is N2C 3 The total number of variables in the system is N3C 10 1 The difference between the two NC 7N 1 variables must be speci ed in order to obtain a unique solution for the system These speci cations typically are number of stages feed ow rates feed pressures feed temperatures side stream ow rates enthalpy inputoutputs stage pressures and feed compositions The system can be solved to obtain compositions in vapor and liquid streams in each stage vapor and liquid ow rates in each stage and stage temperatures Mathematical modeling of simple batch distillation yield the equation dx W 1 ln f m1 gray x Where W0 and W are the amounts of material in distillation still at the start of the distillation and any time t after that respectively The distillate composition y and the still composition x vary with time Simpli ed expressions can be obtained under conditions of constant equilibrium ratio or constant relative volatility