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Phase Envelope Of Gas

natural gas cricondenbar

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#1 274@P6


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Posted 19 March 2020 - 01:41 AM

Hi to all,


how to review the gas composition w.r.t phase envelope and cricondenbar? how these will affect natural gas separation(LTS separation) and hydrate formation.


Here i have attached phase envelope. PFA

gas composition

(Dry Basis)

Composition Mole Fraction
Methane 0.8649 3-Mpentane 0.0000
Ethane 0.0466 n-Hexane 0.0006
Propane 0.0467 Benzene 0.0000
i-Butane 0.0088 Cyclohexane 0.0000
n-Butane 0.0134 2-Mhexane 0.0000
22-Mpropane 0.0000 3-Mhexane 0.0000
i-Pentane 0.0031 n-Heptane 0.0005
n-Pentane 0.0029 CC8= 0.0000
Cyclopentane 0.0000 H2O 0.0000
22-Mbutane 0.0000 CO2 0.0120
23-Mbutane 0.0000 Nitrogen 0.0005
2-Mpentane 0.0000 EGlycol 0.0000




Attached Files

Edited by 274@P6, 19 March 2020 - 01:42 AM.

#2 PaoloPemi


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Posted 19 March 2020 - 02:50 PM

I attach the phase diagram calculated with GERG 2008 model (in Libre Office)




the reported CricondenBar is about 100 Bar,
for hydrates to form you need some water in the mixture,
separation depends from many factors, mainly difference in density (vapor vs. liquid) and relative speed,
see GPSA or similar for a detailed discussion,

in this forum there are many experts (Bobby Strain and others) who can help in this area

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