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Acetone is to be recovered from an aqueous waste stream by continuous distillation. The feed will contain 10 per cent w/w acetone. Acetone of at least 98 per cent purity is wanted, and the aqueous effluent must not contain more than 50 ppm acetone. The feed will beat 20°C. Estimate the number of ideal stages required. [20 marks] Latent heat of water = 41,3605/mol op water = 75.3 J/mol (mean) Latent head of acetone = 28, 4105 lmol Opacotone = 1283/mol C Table 2 : VLE data for the acetone-water system at 1 atm. 0.0 0.0 100 0.05 0.6381 74.8 0.100.150.200.250.300.350.400.450.50 0.7301 0.7716 0.7916 0.8034 0.8124 0.8201 0.8269 0.8376 0.8387 68.53 65.26 0.63.59 6 2.6 61.87 61.26 60.75 60.35 59.95 BP. °C 0.55 0.550 .600 .650.700.750 .800 .85 0.8455 0.8455 0.8532 0.8615 0.8712 0.88170.895 0.9118 59,5459.5459.12 58.71 58.29 57.9 57.4957.08 0.90 0.9335 56. 68 0.95 0.9627 5 6.3 BP. OC

 
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