QUESTION 1

A mixture of 6% pentane, 54% hexane, 30% heptane and 10% octane are distilled at

1 atm. The goal is to recover 96 mol% of hexanes in the overhead and heptane appears in the bottom products. The feed is boiling liquid.

92 mol% of

Ki 3.62

1.39

0.56 0.23

Table 1: A mixture of the composition with K-Value.

Component Pentane Hexane Heptane Octane

xF F xF 0.06 6

0.54 54

0.3 30

0.1 10 100

Moles in D

xD

Moles in B

xB

1.1. Determine the Light and Heavy Key components for the system.

1.2. Complete the table above and calculate the relative volatility.

1.3. Using Underwoods method determine the range of the required value of

(=1.2, 1.3,1. 35). (11)

1.4. Determine the minimum reflux ratio. (3)

1.5. Determine the minimum number of stages. (4)

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