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Example Problem - Multiple Unit Process

# Example Problem - Multiple Unit Process - ProblemStatement...

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Problem Statement: Polypropylene fumerate is a promising polymer for implants for orthopedic applications. It is synthesized in a methylene chloride solvent using a zinc chloride catalyst. Since ZnCl 2 is potentially toxic to human cells, it needs to be rinsed from the polymer solution. After processing both the polymer precipitate and the catalyst are dissolved in methylene chloride. The polymer stream is washed in two sequential units with the solvent methylene chloride. The system should operate such that there is an order of magnitude reduction in the wt% of catalyst in the recovered polymer stream after processing by the two wash units. The unprocessed polymer solution contains 40 wt% polymer, 10 wt% catalyst, and 50 wt% solvent. 80% of the catalyst fed into each unit leaves in the waste solution, and the catalyst concentration in this solution is the same as in the polymer mixture leaving the unit. The units are operated such that the

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