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1. An extraction cascade uses isopropyl ether to extract acetic acid from an aqueous mixture. The equilibrium data are enclosed. The feed enters at 1,000 kg/hr and 35% HAc by weight. Pure isopropyl ether enters counter-currently. The extract exits at 2500 kg/hr and contains 12% HAc by weight. How many stages are required? What is the final raffinate composition of HAc? Remember the definitions of Δ, and that the extract is the solvent-rich phase consistent with the book's notation on extraction.

2. Tantalum salt is extracted from ore in an extraction (leaching) process. Waste from this process is a wet sludge containing 2% tantalum salt by weight. Prior to economic analysis for further recovery of tantalum from this sludge (tantalum is worth $500/lb), calculate the % recovery of the salt if two (cross-current) washes are used with the same solvent to wet feed ratio of 2.0 in each stage. The equilibrium information is provided from the bulk mailing file. Note!! The x-axis has been expanded!! Assume the overflow contains no solids, and the underflow is constant solution/inerts of 1.5. Use a feed basis of 100 lb/hr of wet sludge, i.e. the “waste” stream from the original process.

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