In Example 13-1, we assumed we were going to use all available solvent. There are other alternatives. Determine if the following alternatives are capable of producing outlet water of desired acetic acid concentration.

a. Use only pure solvent at bottom of extractor.

b. Mix all pure and impure solvents together and use them at bottom of column.

c. Mix all pure and part of impure solvent together and use them at bottom of column.

Example 13-1

 

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A feed of 100.0 kg/min of a 1.2 wt% mixture of acetic acid in water is to be extracted with 1-butanol (aka n- butanol) at 1 atm pressure and 27C. We desire an outlet concentration of 0.1 wt% acetic acid in the exiting water. Pure 1-butanol solvent stream 1 is available at 44.0 kg/min and solvent stream 2 that is 1-butanol with 0.4 wt% acetic acid is available at 30.0 kg/min. Devise a scheme to do this separation, find the outlet flow rate and concentration of the exiting 1-butanol phase, and find the number of equilibrium contacts needed.