The distillation of a mixture of iso-propanol (C3H30) and water (H2O) is being m

Question

The distillation of a mixture of iso-propanol (C3H30) and water (H2O) is being modeled in Aspen Plus with the shortcut distillation block (BSTWU). Specifications call for 99.0% of the iso-propanol and 0.05% recovered in the overhead distillate stream. The distillation column will have 30 trays and the column is to be run at atmospheric pressure for the entire column and the distillate stream is to have no vapor. File Home Economics Dynamics Equation Orier View Customize Resources Search aspenONE Exchange % Cu + NIKE Pressure Relief DE Copy SPRD Rating Units Next Run Step Stop Reset Control Reconcile Summary Analysis Paste Panel Flare System Clipboard Run Safety Analysis Simulation Main Flowsheet X B1 (DSTWU)X + All Items Specifications Calculation Options Convergence Information 02 -Column specifications Pressure © Number of stages: Condenser: psio Le Blocks 4 La B1 Reflux ratio: Reboiler Input -Key component recoveries Condenser specifications Block Options Light key Total condenser > L EO Modeling Comp: Partial condenser with all vapor distillate Recov: Properties O Partial condenser with vapor and liquid distillate Heavy key: - Simulation Distillate vapor fraction: Comp: Safety Analysis Recov: psia by Energy Analysis Model Palette Required Input Incomplete Check Status 100% a) In the menu shown in the picture above, fill in the information given in the appropriate spaces. b) In the screen shown under the Condenser Specifications area, is the correct option currently selected? If not, which option should be selected?

Explanation / Answer

A) among iso propanol and water , iso propanol is more volatile and hence that will be the light key component and water will be the heavy key component

along with that we can enter the number of trays data provided in the question

Also since the whole operation is carried out at atmospheric condition the column and reboiler can be operatred at atmospheric pressure

b) now a partial condensor wll give two stream one vapor stream and other a iquid stream both will be in equilibirum with each other. Here in the data provided in the question, we require purelya liquid distillate stream. Hence the selected option is incorrect and the correction option will be a total condensor.

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