EQUILIBRIUM DATA FOR ACETONE-H,O AT 101.3 kPa T, °C 56.7 57.1 60.0 61.0 63.0 100 71.7 Mol% A in liquid: 100 Mol% A in vapor: 100 92.0 50.0 33.0 17.6 6.8 85.0 83.7 94.4 80.5 69.2
Partial vaporization of feed to a distillation column.
A fractionation tower operating at 101.3 kPa produces a distillate of 95 mol% acetone (A), 5 mol% water, and a residue containing 1 mol% A. The feed liquid is at 125oC and 687 kPa and contains 57 mol% A. Before entering the tower, the feed passes through an expansion valve and is partially vaporized at 60oC. From the databelow, determine the molar ratio of liquid to vapor in the feed. Enthalpy and equilibrium data are: molar latent heat of A = 29,750 kJ/kmol; molar latent heat of H2O = 42,430 kJ/kmol; molar specific heat of A = 134 kJ/kmol-K; molar specific heat of H2O = 75.3 kJ/kmol-K; enthalpy of high-pressure, hot feed before adiabatic expansion = 0; enthalpies of feed phases after expansion are hV= 27,200 kJ/kmol and hL = -5,270 kJ/kmol. All data except K-values, are temperature-independent.
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