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Water Content In Natural Gas With Eos

water content natural gas eos

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#1 pdender

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Posted 04 March 2014 - 11:41 AM

I am comparing different methods available in Prode library

 

ISO 18453

CPA

Extended Peng Robinson

Extended Soave Redlich Kwong

GERG (2008)

 

with published data (Data and prediction of water content of high pressure nitrogen methane and natural gas Fluid Phase Equilibria, 2007, GPSA data, and others),

my understanding is that complex models as CPA or GERG may not offer significant advantages for VLE of mixtures of HC (mostly methane) + N2 and water over extended  EOS as ISO (18453) or the Peng Robinson / Soave with temperature dependent BIPs available in ISO and Prode,

is that true ?

For which natural gas mixtures (or applications) should I use CPA models which are recommended by many authors ?

 

 

 

 



#2 serra

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Posted 04 March 2014 - 12:20 PM

according the authors GERG should be the most accurate model for natural gas,

but if you need water content ISO 18453 is a good alternative, quick and accurate,

I have compared values with McKetta charts and other sources,

 

for applications of CPA you may read Thermodynamic Models for Industrial Applications by the authors (Kontogeorgis and Folas),

the book includes several examples as

Glycol-Water-Hydrocarbon phase equilibria,

phase equilibria for mixtures with acid gases (CO2 and H2S)

phase equilibria with alcohols, amines and alkanolamines

etc.

CPA has many applications in natural gas industry but it may require some care to define the parameters.



#3 pdender

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Posted 05 March 2014 - 02:10 AM

thanks serra,

I have a paper by Folas discussing applications of CPA and SAFT (with association) for natural gas mixtures,

if I understand correctly these models should be considered when there is presence of water or other polar chemicals such as methanol glycols and so on, is that true ?



#4 serra

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Posted 05 March 2014 - 06:13 AM

correct,

the association part should improve accuracy with polar fluids,

but CPA (and SAFT) have been tested on a broad range of applications

including natural gas.



#5 pdender

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Posted 24 March 2014 - 09:14 AM

thanks,

as I see, for my applications temperature dependent BIPs (available in PRODE for SRK and PR)

give good accuracy,

these models seem more reliable when generating a phase envelope, too.






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