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NGL Fractionation Train

The document outlines the process of natural gas fractionation using three towers: De-Methanizer, De-Ethanizer, and De-Propanizer, detailing specifications for two wells and the energy requirements for each stage. It includes specific conditions such as pressures, temperatures, and flow rates for each tower, along with modifications needed to achieve desired product compositions. The document emphasizes the separation of methane, ethane, and propane from the gas mixture for transportation and various applications.

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rajviraltech
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32 views3 pages

NGL Fractionation Train

The document outlines the process of natural gas fractionation using three towers: De-Methanizer, De-Ethanizer, and De-Propanizer, detailing specifications for two wells and the energy requirements for each stage. It includes specific conditions such as pressures, temperatures, and flow rates for each tower, along with modifications needed to achieve desired product compositions. The document emphasizes the separation of methane, ethane, and propane from the gas mixture for transportation and various applications.

Uploaded by

rajviraltech
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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NGL Fractionation Train

Natural gas will be processed to remove the heavier hydrocarbons from it to be suitable for transportation
by passing the crude gas coming from two different wells to three towers: De-Methanizer, De-Ethanizer
and De-Propanizer. Specifications for each well are as follow:

Component Well 1 Mole fraction Well 2 Mole fraction


N2 0.0025 0.0057
CO2 0.0048 0.0029
C1 0.7041 0.7227
C2 0.1921 0.1176
C3 0.0706 0.075
n-C4 0.0112 0.0204
i-C4 0.0085 0.0197
n-C5 0.0036 0.0147
i-C5 0.002 0.0102
n-C6 0.0003 0.0037
n-C7 0.0002 0.0047
n-C8 0.0001 0.0027
FP PR
Temperature F (140) (120)
Pressure Psia 330 332
Flow rate lbmol/h 3,575 475

Energy supplied to the De-Methanizer is (2e6 BTU/hr) which is used to improve the efficiency of
separation.

The De-Methanizer (reboiled absorber) has the following specifications: -

Feed 1: Material Stream enters the column from the top stage

Feed 2: Material stream enters from the 2nd stage

Ex-duty Energy enters from the 4th stage

Number of stages = 10

Top Stage pressure = 330 psia

Reboiler pressure = 335 psia

Top Stage temperature = -125oF

Reboiler temperature = 80 oF

Ovhd Prod Rate = 2950 lbmole/hr


When the model is finished, modify it to ensure that overhead molar fraction of the methane is 0.96

Most of methane is removed from the top of the tower and the bottom stream is pumped to 2,790 kpa then
enters the De-Ethanizer (distillation Column) where most of the ethane is taken as an overhead product
then processed to use in different applications.

The de-ethanizer has the following specifications:

Specification Value
No of stages 14
Inlet stream DC2 Feed
Inlet stage 6
Condenser type Partial
OH Vapor product DC2 OH
OH Liquid Product DC 2 Dist
Bottom liquid outlet DC 2 Btm
Reboiler duty energy stream DC2 Reb Q
Condenser duty energy stream DC 2 Cond Q
Condenser pressure 2725 Kpa
Condenser DP 35 Kpa
Reboiler pressure 2792 Kpa
Condenser T -4 C
Reboiler T 95 C
Specifications
OH Vapor rate 320 kgmole/h
Dist rate 0 kgmole/h
Reflux Ratio 2.5 (Molar)

When the model is finished, modify it to ensure that the bottom stream has ratio between C2/C3 = 0.01

The bottom product is sent to a valve to decrease pressure to 1690 kpa, outlet flow is sent to a de-
propanizer (distillation Column) where most of propane is removed from the top and the heavier
hydrocarbons is removed from the bottom
The specifications of the de-propanizer are:

Specification Value
No of stages 24
Inlet stream DC3 Feed
Inlet stage 11
Condenser type Total
OH Liquid product DC3 Dist
Bottom liquid outlet DC3 Btm
Reboiler duty energy stream DC3 Reb Q
Condenser duty energy stream DC3 Cond Q
Condenser pressure 1585 Kpa
Condenser DP 35 Kpa
Reboiler pressure 1655 Kpa
Condenser T 38 C
Reboiler T 120 C
Specifications
Dist rate 110 kgmol/h
Reflux Ratio 1 (Molar

When the model is finished, modify it to ensure that overhead molar fraction of the i-C4 & n-C4 =0.15
and propane bottom product molar fraction = 0.02

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