1. A distillation column separates a feed stream containing ethane and ethylene. The bottom product has 64.45% ethane. 2. A column separates a feed of acetone, water, and hexane. With a reflux ratio of 1.3, the overhead has 52% acetone. The reboiler and condenser heat duties are calculated. 3. An absorber column removes CO2 from a methane stream using propylene carbonate solvent. With the conditions given, the CO2 mol% in the gas stream is found along with the column height and diameter.

1. Simulation -3
Eng. Kareem Hossam Eng. Amal Magdy

2. Distillation (1)
• A stream contains 40% ethane and 60% ethylene by mol. enters a distillation
column that has 60 trays. Working under total condensation with a pressure of
100kPa in both evaporator and condenser.
• The feed stream is 50% vapor, at a pressure of 100kPa and 100 kgmole/hr
• Reflux ratio 1.4
• Bottom product rate 60 kgmole/h
• Find the composition of ethane in both top and bottom products.
• Hint: fluid package  Peng Robinson
Top: 3.22%
Bottom: 64.45%

3. Distillation (2)
• A stream contains Acetone, water, and 3 methyl hexane. Is sent to a distillation
column so the acetone can be recovered. The stream is at 27 degree Celsius and 100
kPa. It is sent to a 50 trays distillation column at a flow rate of 3 kgmole/h. both
reboiler and condenser works at 100 kPa.
• The composition of the feed stream in (mol%) is:
• Acetone: 0.5179
• 3 m-hexane: 0.4794
• Water: 0.0027

4. Distillation (2)
• If it is given that
• Reflux ratio = 1.3
• The needed component mole fraction of acetone at the overhead stream is 52%
• Find:
• The molar flow rate of acetone (at the overhead product)
• The heat duty of reboiler and condenser.
• Hint: fluid package  Peng Robinson
• Total reflux

5. Absorber
• Carbon dioxide can be absorbed using propylene carbonate. Design an
absorber in which a stream of 20 mol% carbon dioxide and 80 mol%
methane is sent with a volumetric flow rate of 2 m3/s to contact 2000
kgmole/hour of solvent. (fluid package Sour PR)
• Given that the column operates at 60 atm and 60 degrees Celsius. Find
1- CO2 mol% in the gas stream
2- The column height and diameter in case of packing.

6. De-methanizer
• A feed that has the following composition, flowing
at 1620 kgmole/h is sent to de-methanizer at a
temperature of -95 C and 330 psia
• Hint: de-methanizer is a reboiled absorber with 10
stages
N2 0.0025
CO2 0.0048
C1 0.7041
C2 0.1921
C3 0.0706
i-C4 0.0112
n-C4 0.0085
i-C5 0.0036
n-C5 0.002
C6 0.0003
C7 0.0002
C8 0.0001

7. De-methanizer
• Another feed is entering the demethanizer in the
second stage from top, at -85C and 332 psia at a
flow rate of 215 kgmole/hr. and has the
following composition.
• A side heater is used on the column that has an
energy flow of 2.1 x 106 kj/h
• Hint (let it enter the 4th stage from top)
Component Mole Fraction
N2 0.0057
CO2 0.0029
C1 0.7227
C2 0.1176
C3 0.075
i-C4 0.0204
n-C4 0.0197
i-C5 0.0147
n-C5 0.0102
C6 0.0037
C7 0.0047
C8 0.0027

8. De-methanizer
• The demethanizer parameters are
• 1- top stage
• pressure = 330 psia
• Temperature= -87.22 C
• 2- reboiler
• pressure= 335 psia
• Temperature= 26.67 C

9. Find
• 1- the mole fraction of methane at the top stream. At overhead flow rate of
1338kgmole/h
• 2- the overhead flow rate corresponding to methane mole fraction 0.96 at the
top stage.