The following problem is based on data and analyses of ternary gas diffusion for the system CO
Question:
The following problem is based on data and analyses of ternary gas diffusion for the system CO2
(A)/H2O (B)/H2 (C) at 40°C and 155 mmHg absolute pressure.
(a) Estimate the binary diffusion coefficients 
, 
, and 
for these conditions. (b)Consider a situation where at a certain point in a separation unit steady-statediffusion of this ternary mixture occurs through a stagnant gas film with thickness Δ = 0.1 cm. A solubility barrier prevents C from moving while A and B can freely diffuse. On one side of the film we have 
= 0, 
= 0.7and 
= 0.3. On the other side of the film, we have 
= 0.2. Obtain thesteady-state diffusion fluxes of A and B as a function of 
for 
.Plot the values of 
for each component vs. 
in this range. Note that 
.
(c) Find the value of 
for which the flux of B iszero. Explain what happens between this value and 
= 0.7. Note that inthis range, the gradient in 
is negative; i.e., 
.
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Heat And Mass Transfer For Chemical Engineers Principles And Applications
ISBN: 9781264266678
1st Edition
Authors: Giorgio Carta
