# Continuing the problem defined in Example 4.3, use a rigorous simulation to carry out tray sizing and

## Question:

Continuing the problem defined in Example 4.3, use a rigorous simulation to carry out tray sizing and estimate the required column diameter.

**Data from example 4.3**

This example provides more detail on the solution of the problem that was introduced as Example 1.1. The original problem statement was to optimize the design of a distillation column to separate 225 metric tons per hour of an equimolar mixture of benzene, toluene, ethylbenzene, paraxylene and orthoxylene with minimum total annualized cost. The feed is a saturated liquid at 330 kPa. The recovery of toluene in the distillate should be greater than 99%, and the recovery of ethylbenzene in the bottoms should be greater than 99%. In this example, a column simulation should be set up using a shortcut model. The shortcut model results will be used to initialize a rigorous model in the example that follows. Determine:

i) The minimum reflux ratio.

ii) The minimum number of trays.

iii) The actual number of trays when the reflux is 1.15 R_{min}.

iv) The optimum feed tray.

## Step by Step Answer:

**Related Book For**

## Chemical Engineering Design

**ISBN:** 9780081025994

6th Edition

**Authors:** Ray Sinnott, R.K. Sinnott, Sinnott Gavin Towler