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Unformatted text preview: Example No 12 The mass balance of an adsoption process with n stages will be discussed as an example of a linear single variable system (Bequette, 1998). Figure 1 illustrates a a representation of the mass balalnce for the adsorption column. The flow conditions are as the following: Liquid flow rate, L=50 kgmole/hr; vapor flow rate, V=80kgmole/hr; Liquid holdup per stage, M=5 kgmole; Equilibrium ratio, K=0.3; solute mole fraction in liquid feed, x Lf =0; solute mole fraction in vapor feed, x Vf =0.15; Figure 1. The mass balance for any intermediate stage I is given by ( 29 i i 1 i 1 i i i Vy Lx Vy Lx dt Wy Mx d-- + = + +- (1) assumed major contribution in the accumulation term from liquid phase, ignore contribution from gas phase ( 29 i i 1 i 1 i i Vy Lx Vy Lx dt Mx d-- + = +- (2) assume constant liquid holdup, M i i 1 i 1 i i y M V x M L y M V x M L dt dx + - + = +- (3) Equilibrium relation (ideal system assumption) i i Kx y = (4) where K is equilibrium ratio (pls refer to you Thermodynamics text book)...
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This note was uploaded on 03/21/2010 for the course ENGINEERIN Advance Pr taught by Professor - during the Spring '10 term at Universiti Teknologi Malaysia.
- Spring '10
- Mass Balance