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Simple Batch Distillation of an Ethanol-Water Mixture
Simple Batch Distillation of an Ethanol-Water Mixture
An equimolar binary mixture of ethanol and water is to be separated in a still pot, which initially contains 0.575 kmol of the mixture. You can set the operating pressure, , of this simple batch distillation experiment, where can vary from 700 to 900 mmHg so that the ideal gas-phase assumption holds.
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This Demonstration plots the temperature of the liquid in the still, , and the temperature of the distillate (i.e., condensed vapor exiting from the still), , versus time (green and magenta curves, respectively). As expected, lags behind because the distillate is richer in ethanol.
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In addition, you can see the plots of the composition in the still, , and in the distillate, . For this transient problem, computations include both the mass and the energy balance equations. For higher total pressure values, the temperature profiles are shifted to higher values. A constant-heating policy of the still pot is used with 2.125kW.
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