CL 351                                   Homework # 11

 

Due date: 4 November 2004

 

1.       An 11.5 wt% mixture of acetic acid in water is to be extracted with 1-butanol at 1 atm and 26.7oC.  We desire outlet concentration of 0.5 wt% in the water and 9.6 wt% in the butanol.  Inlet butanol is pure.  Find the number of equilibrium stages and the ratio of water to butanol. The equilibrium is represented as y = 1.613 x where y is mole fraction of acid in butanol phase and x is mole fraction of acid in aqueous phase.

 

2.       The feed mixture in Problem 1 is separated in a cross flow extraction system at 26.7oC and 1 atm.  The same amount of solvent in Problem 1 is divided equally among four stages.  Find the outlet concentrations of all streams.

 

3.       Do the problem discussed in tutorial.

 

4.       You have a three-stage extractor with which you are isolating a therapeutic protein with physical properties similar to myoglobin from 9400 liters of a clarified beer.  The extraction solvent is an organic solution of inverted micelles of Aerosol OT in dodecanol, which at pH of 6.2 has a partition coefficient given by y = 180x.  How much solvent will you need to recover ninety-five percent of the protein?