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Cloud Point On Hysys


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#1 DANA-IF

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Posted 06 November 2015 - 02:17 AM

Dear friends ;

 

In the HYSYS oil manager , I have inputted the bulk density , the distillation assay data .

 

The resulted stream ( diesel fluid ) have nearly the same flash point and cetane index as reported in the laboratory data , but I

 

haven't matched the cloud point value : it should be 22 C and HYSYS  gives me -18 C .

 

I'm wondering please if someone could guide me on that ?

 

 

Thanks a lot !

 

Regards !


Edited by DANA-IF, 06 November 2015 - 07:29 AM.


#2 serra

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Posted 06 November 2015 - 11:27 AM

assuming you mean incipient solidification (wax precipitation etc.)

for accurate results you would need a software capable to solve phase equilibria including solids,

I have used the multiphase flash in Prode Properties (plus the model for wax) but there are other tools which may do the work.

 

Differently (as it seems it is your case) you may get an estimate based on some generic correlation,

see for example Characterization and Properties of petroleum fractions (Riazi) page 381 and following for the correlations proposed by Pedersen and others...



#3 PingPong

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Posted 06 November 2015 - 02:07 PM

Process simulators that calculate cloud points (CP) or pour points (PP) usually use correlations based on only gravity and average boiling point of a stream. The CP or PP calculated in such way are not accurate at all, useless really.

 

It is nevertheless strange that the difference between actual and calculated CP would be as big as 40 oC like in your case.

Moreover a gasoil with a CP as high as 22 oC should not be called diesel.



#4 DANA-IF

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Posted 06 November 2015 - 02:51 PM

Process simulators that calculate cloud points (CP) or pour points (PP) usually use correlations based on only gravity and average boiling point of a stream. The CP or PP calculated in such way are not accurate at all, useless really.

 

It is nevertheless strange that the difference between actual and calculated CP would be as big as 40 oC like in your case.

Moreover a gasoil with a CP as high as 22 oC should not be called diesel.

Hello ; 

As reported in the laboratory data , the fluid is DIESEL-6



#5 PingPong

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Posted 06 November 2015 - 03:08 PM

the fluid is DIESEL-6
I don't know what is meant by Diesel-6.

#6 titim

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Posted 14 November 2015 - 09:55 AM

cloud point of gasoil 22 °C ???? , you must review the laboratory.


Edited by titim, 14 November 2015 - 09:56 AM.





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