Question: A pilot-scale countercurrent multistage liquid-liquid extraction (LLE) process is designed for reducing the concentration of ethanol contained in an aqueous feed (450 kg/h ) of

A pilot-scale countercurrent multistage liquid-liquid extraction (LLE) process is designed for

A pilot-scale countercurrent multistage liquid-liquid extraction (LLE) process is designed for reducing the concentration of ethanol contained in an aqueous feed (450 kg/h ) of ethanol and water only from 30.1% to 4% (by mass). Pure benzene (780kg/h ) will be used as the entrainer (i.e. as solvent) at 25C. For this LLE process, apply the Hunter-Nash approach and estimate the number of actual LLE equilibrium stages required for an overall stage efficiency 78%. Use the 'Ternary Diagram Sheet-Annex (LLE)' provided to answer this question. Carefully fold and attach the 'Ternary Diagram Sheet-Annex (LLE)' with your answer book(s). The LLE experimental data (\% by mass) for the Benzene-Ethanol-Water ternary system at 1 bar and 25C are provided below. The plait point is at 32% Benzene \& 41% Ethanol

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