Pure chlorobenzene is being used to recover pyridine from water (1000 kg/h, 40 wt% pyridine and 60 wt% water).

a) A single stage mixer-settler system has been proposed to achieve an outlet extract that is 22 wt% pyridine. Determine the outlet extract and raffinate compositions as well as the % of pyridine recovered and solvent flow rate.

b) For part (a), how would increasing the solvent flow rate change the outlet compositions? How would the % recovery change if solvent flow rate was increased? Explain without calculations.

c) The same feed from the original problem statement is instead sent to a countercurrent multi-stage extraction system. The goal raffinate composition is 3 wt% pyridine, and the extract composition is 22 wt% pyridine. Determine the amount of solvent required and the number of stages necessary. What is the extract flow rate?