Xolani is a chemical engineering student working at a separation company. He was given a mixture of hydrocarbons to separate in a continuous distillation column. The feed mixture contains 5% mol C3, 15% mol i-C4, 35% mol n-C4, 20% mol i-C-5, and 25% mol n-Cs. The feed has a flow rate of 200 kmol/h and enters as a liquid at the boiling point. It is desired to recover 96% mole fraction of the light key in the distillate and 92% of the heavy key in the bottom product. The average relative volatility (a) values are given in Table 1. Table 1: The average relative volatility (a) Feed stream C3 i-C4 n-C4 i-C5 n-C5 α 5.0 2.6 2.0 1.0 0.85 1.1. Determine the light key (LK) and heavy key (HK) components. 1.2. Give the material balances over the column (give composition of bottoms and distillate streams) in table form. 1.3. Use Underwood's method to determine the minimum reflux ratio (Rmin) (estimated values of 0 are 1.2, 1.3 and 1.4). 1.4. Use the Fenske equation to determine the minimum number of trays. 1.5. Use Kirkbride's method to determine the location of feed tray if the tray efficiency is 50%.
Xolani is a chemical engineering student working at a separation company. He was given a mixture of hydrocarbons to separate in a continuous distillation column. The feed mixture contains 5% mol C3, 15% mol i-C4, 35% mol n-C4, 20% mol i-C-5, and 25% mol n-Cs. The feed has a flow rate of 200 kmol/h and enters as a liquid at the boiling point. It is desired to recover 96% mole fraction of the light key in the distillate and 92% of the heavy key in the bottom product. The average relative volatility (a) values are given in Table 1. Table 1: The average relative volatility (a) Feed stream C3 i-C4 n-C4 i-C5 n-C5 α 5.0 2.6 2.0 1.0 0.85 1.1. Determine the light key (LK) and heavy key (HK) components. 1.2. Give the material balances over the column (give composition of bottoms and distillate streams) in table form. 1.3. Use Underwood's method to determine the minimum reflux ratio (Rmin) (estimated values of 0 are 1.2, 1.3 and 1.4). 1.4. Use the Fenske equation to determine the minimum number of trays. 1.5. Use Kirkbride's method to determine the location of feed tray if the tray efficiency is 50%.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Xolani is a chemical engineering student working at a separation company. He was
given a mixture of hydrocarbons to separate in a continuous distillation column. The
feed mixture contains 5% mol C3, 15% mol i-C4, 35% mol n-C4, 20% mol i-C-5, and
25% mol n-Cs. The feed has a flow rate of 200 kmol/h and enters as a liquid at the
boiling point. It is desired to recover 96% mole fraction of the light key in the distillate
and 92% of the heavy key in the bottom product. The average relative volatility (a)
values are given in Table 1.
Table 1: The average relative volatility (a)
Feed stream
C3
i-C4
n-C4
i-C5
n-C5
α
5.0
2.6
2.0
1.0
0.85
1.1. Determine the light key (LK) and heavy key (HK) components.
1.2. Give the material balances over the column (give composition of bottoms and
distillate streams) in table form.
1.3. Use Underwood's method to determine the minimum reflux ratio (Rmin)
(estimated values of 0 are 1.2, 1.3 and 1.4).
1.4. Use the Fenske equation to determine the minimum number of trays.
1.5. Use Kirkbride's method to determine the location of feed tray if the tray
efficiency is 50%.
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