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 compared to water

Hence iso -propnaol will be the light key and water will be the heavy key component

trays as given in question as 30 trays can be filled

The whole column and everything is run under atmospheric pressure hence column and reboiler pressure can be kept as 1 atm

b) Now as per the data provided in the question we need the distillate in purely liquid form. If we have a partial condensor we will have a liquid stream and a vapor stream as a distillate stream. Hence the option selected is wrong and the option of total condensor should be used

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