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Assay Characterization

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#1 mahdik79


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Posted 11 September 2019 - 11:46 PM

Dear friends,

Hello. I need help to characterize the assay in hysys. According to PFD the feed condensate composition is:

H2  :   0

C1  :   0

C2  :   30 kg/h

C3  :   1928 kg/h

C4  :   9609 kg/h

C5 - NBP 95  : 76842 kg/h

NBP 95 - NBP 149  :69388 kg/h

NBP 149 - NBP 175 : 24213 kg/h

NBP 175 - NBP 232 : 53743 kg/h

NBP 232 - NBP 342 : 47850 kg/h

NBP 342 - NBP 369 : 6541 kg/h

NBP 369+ : 6436 kg/h

H2O : 47 kg/h

(P=4.5 barg, T=25 degC, Total Flow rate=296627 kg/h)

1. How can I define the related streams on hysys for example {NBP342 - NBP369} ?

2. When I enter the TBP distillation data ( Distilled wt% vs. Temp.) in hysys environment, Calculated TBP distillation curve by hysys is not matched completely with the experimental data from the Lab. Is there any way to match thses curves and have better regression.

Thanks in advance.



#2 Pilesar


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Posted 12 September 2019 - 05:44 AM

The format of the composition on the PFD indicates this is the output of a simulation. The only hope of matching that exactly is to use the simulation that generated the output. If your 'experimental data from the lab' is recent, I doubt it would match the PFD composition either. So choose which one you want to match. I suggest trying to match the real world instead of some old simulation will be more useful.

#3 PingPong


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Posted 14 September 2019 - 04:14 AM

In any case you need to break down the assay composition in many more fractions as input to a simulation, no matter whether you use the PFD composition or the laboratory TBP distillation.


Prepare a graph, or use curve fitting, and break it down to fractions of about 10 oC width each.

Also break down the NBP 369+ fraction. Use your ....... imagination. Anything is better than relying on the voodoo algorithms of some simulator for that.

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