Question about the Fluid Recombination
Question about the Fluid Recombination
(OP)
I did recombine the condensate and the dry gas to find out the recombination of fluid at reservoir condition. However, my phase envelope did not show the critical point. Is that a resonable result? And if the fluid has not a critical point, could you guys explain for me?





RE: Question about the Fluid Recombination
RE: Question about the Fluid Recombination
RE: Question about the Fluid Recombination
HYSYS also had problems with this fluid i recall - but im sure if it actually could determine the critical point.
I think the problem occurs if the PT curve becomes very steep near the CP.
I just tried to skim through the pages of Smith & Van Ness on the subject but im still not sure if a defined CP has to exists for all mixtures or not.
Best rgards
Morten
RE: Question about the Fluid Recombination
Recombined Comp
C1 0.8228
C2 0.0952
C3 0.0464
iC4 0.0064
C4 0.0096
iC5 0.0035
C5 0.0029
C6 0.0029
C7+ 0.0103
For C7+
MW= 113lb/lb mole
spgr= 0.794
RE: Question about the Fluid Recombination
RE: Question about the Fluid Recombination
I also assumed your compositions were mol%
C7 as heavy, Tc = -64.2F, Pc = 662.2 psia
C8 as heavy, Tc = -66.9F, Pc = 663.3 psia
C9 as heavy, Tc = -69.4F, Pc = 664.4 psia
RE: Question about the Fluid Recombination
RE: Question about the Fluid Recombination
I got Tc:-35 deg C=-31F
Pc=91 bar=1320psia
Changing to pure nC8 i got:
Tc=-49 deg C=120F
Pc=93 bar=1199 psia
That quite different fro your finding TD2C
RE: Question about the Fluid Recombination
Crit Point --47.38F 1267pisa pure C8
Crit Point -46.35F 1316psia
pure C9
No Crit Point found.
I used PR correlation also. When i changed to SRK
No crit pt found for C8, C9.
However, i still think we cant ignore the C10...C40 for heavy component.
RE: Question about the Fluid Recombination
Ct=-52.63C Pt=76.39bar.
Still have a big gap b/w u guys results.