Ficks Law

Question 1

To find m or H

Answer 1

1. To find H, use the equation cg=Hcl, where cg is concentration in gas and cl is concentration in liquid.
2. Write out cg and cl in a form that they include y and x

Question 2

calculate t

Answer 2

1. Derive an accumulation term
2. Write a mass balance => accumulation= in-out
3. If flux is your in/out term, ,make sure your accumulation is written in terms of per unit area
4. Rearrange expression for integration and integrate to derive an expression for t

Question 3

Calculate L/G min

Answer 3

1. Write a mass balance for find L/Gmin (you can replace yt-yb with yt* as gas leaves saturated with the respective liquid.)
2. Write yt* with equilibrium expression (in this case yt*=mx)
3. Calculate your m value by rewriting Henry’s Law expression given in terms of y*=mx)

Question 4

To calculate height of column

Answer 4

1.Derive the adsorption/desorption expression (consider where the contaminant is being removed from) and rearrange to be equal to Z.
2. Calculate your L and G mole flow rates (make sure units are the same)
3.Calculate any missing variables using mole balance or equilibrium expressions (Henry’s Law)
4. Calculate delta x or ylm values
5. Plug values back into expression for Z