# Aspen tutorial 6: Distillation columns design 

This class is given by Catarina Braz (catarina.braz@epfl.ch).

## Overview

In this class, you are going to learn how to design and analyze the performance of a distillation column.

## Questions

Please consider the product stream from the methanol synthesis developed in Aspen tutorial 4.

1. Apply the model DSTWU (Winn-Underwood-Gilliland) to recover 95% of methanol at 99.85%. Determine the minimum reflux ratio, the minimum number of theoretical stages and the distillate to feed ratio. 

*Answer 1:*

2. Apply the RadFrac model with the data from your previous simulation.
a.    Determine the distillate and bottoms composition and temperature, as well as the heat exchanged in the condenser and reboiler.

*Answer 2.a:*

b.    Determine the reflux ratio and the distillate to feed ratio to get the pretended methanol recovery and purity.

*Answer 2.b:*

c.    Do a sensitivity analysis to study the effect of the location of the feed in the energetic consumptions

*Answer 2.c:*
