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Tut 6

The document outlines a tutorial on multistage operations focusing on distillation calculations for alcohol mixtures and hydrocarbon feeds. It includes tasks to calculate boiling points, vapor compositions, distillate and bottoms compositions, and minimum stages for total reflux. The calculations are based on Raoult's law and specific feed compositions at given pressures.

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24 views1 page

Tut 6

The document outlines a tutorial on multistage operations focusing on distillation calculations for alcohol mixtures and hydrocarbon feeds. It includes tasks to calculate boiling points, vapor compositions, distillate and bottoms compositions, and minimum stages for total reflux. The calculations are based on Raoult's law and specific feed compositions at given pressures.

Uploaded by

sanelelembede09
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Multistage Operations

Tutorial 6

1. The vapor-pressure data are given below for the following alcohols:

The composition of a liquid alcohol mixture to be fed to a distillation tower at 101.32 kPa is
as follows: methyl alcohol (xA = 0.30), ethyl alcohol (xB = 0.20), n-propyl alcohol (xc = 0.15),
and n-butyl alcohol (xD = 0.35). Calculate the following, assuming that the mixture follows
Raoult's law:
(a) Boiling point and composition of vapor in equilibrium
(b) Dew point and composition of liquid in equilibrium

2. The following feed of 100 mol/h at the boiling point and 405.3 kPa pressure is fed to a
fractionating tower: n-butane (xA = 0.40), n-pentane (xB = 0.25), n-hexane (xc = 0.20), and n-
heptane (xD = 0.15). This feed is distilled so that 95% of the n-pentane is recovered in the
distillate and 95% of the n-hexane in the bottoms. Calculate the following.
(a) Moles per hour and composition of distillate and bottoms.
(b) Top and bottom temperature of tower.
(c) Minimum stages for total reflux and distribution of other components (trace
components) in the distillate and bottoms, i.e., moles and mole fractions. [Also
correct the compositions and moles in part (a) for the traces.]

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