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Prode Hydrate Formation Conditions

hydrate temperature pressure formation prode

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#1 bponcet

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Posted 06 January 2015 - 04:50 PM

 
Prode allows the calculation of hydrate formation conditions for all structures - structure I or structure II -  with a natural gas stream including C1 .. C6 plus N2, CO2, and water.
 
Prode predicts formation pressure for structure II as being lower than that of structure I (with operating conditions of  280 K & 25 Bar).
Should I consider the lowest pressure or a specific structure?
What is the difference between structure I and  II?

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#2 twell

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Posted 06 January 2015 - 05:22 PM

according my experience if you select model 1

Prode Properties calculates the lowest formation pressure (including structures I, II, H)

With Prode I adopt that model (1) to verify if hydrates can form at some (specified) conditions.

Note that when free water is not present (you must include water in composition )

the procedure (may) calculate high values for equilibrium pressure.


Edited by twell, 06 January 2015 - 05:23 PM.


#3 bponcet

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Posted 19 January 2015 - 04:50 AM

thanks !

Can you provide the list of inhibitors supported by Prode Hydrate model ? 



#4 serra

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Posted 20 January 2015 - 03:23 AM

bponcet,

as in other software (see Clathrate Hydrates of Natural Gases, Third Edition for details about the procedure)

Prode solves a multiphase flash operation, it doesn't correct with a correlation such as Hammerschmidt,

this means that you can include as inhibitor any chemical whose properties are stored in the software's databank

 

Some points to consider :

 

1) for salts you would need a version of Prode which includes a electrolyte thermodynamic model

 

2) you may observe different values for hydrate temperature depression calculated by the different models available in Prode  (CPA-PR, Peng Robinson NRTL, Peng Robinson UNIQUAC etc.),

according my experience calculated values are conservative.


Edited by serra, 20 January 2015 - 03:24 AM.


#5 bponcet

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Posted 30 January 2015 - 06:33 AM

thanks serra,

I did suppose the procedure in Prode adopted some correlation with a predefined number of inhibitors






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