Hysys - Dew/Bubble point
Hysys - Dew/Bubble point
(OP)
Hi
I am cheking a gas composition (almost Hydrogen, some water vapor and trace of heavy C5+ and C6+) to see wether I am inside the bell or at the right of the bell considering my operating temperature and pressure. I used Peng Robinson as basis EOS.
I get in Hysys only one Dew point curve and I dont see the bubble curve. What does it mean?
Can somehelp
This is urgent thanks in advance
Regards
Wimple
I am cheking a gas composition (almost Hydrogen, some water vapor and trace of heavy C5+ and C6+) to see wether I am inside the bell or at the right of the bell considering my operating temperature and pressure. I used Peng Robinson as basis EOS.
I get in Hysys only one Dew point curve and I dont see the bubble curve. What does it mean?
Can somehelp
This is urgent thanks in advance
Regards
Wimple





RE: Hysys - Dew/Bubble point
the right side(after the critical point) is buble side and the left side is the dew side.
i hope that it was helpful.
RE: Hysys - Dew/Bubble point
Why in some gas composotion we have a well shaped bell and here only one curve?
Thanks for your feedback
Rgds
Wimple
RE: Hysys - Dew/Bubble point
thks
RE: Hysys - Dew/Bubble point
I've seen similar things happen in HYSYS (dew point curve without bubble point curve) when there are hypothetical components present in the material stream. Try to exclude these components and replace them with original components (n-paraffins available in HYSYS library). The properties of hypothetical component cut (C5+) can be tuned by varying mole fractions of original C5+ components.
Good luck,
RE: Hysys - Dew/Bubble point
Thanks for your reply. So definitively it is not normal to see only one curve, thats confort me!
I will try to change the mol% of C5+ try to get some results
Rgds
Wimple
RE: Hysys - Dew/Bubble point
A mixture of H2 and heavy hydrocarbon is a strange system, and a single liquid phase may not be feasible under any reasonable operating conditions. This happens because H2 solubility decreases with decreasing temperature.
RE: Hysys - Dew/Bubble point
Sometimes, you will see in such systems the appearance of second liquid phase (two hydrocarbon liquid phases), due to specific nature of hydrogen.
CJ Kruger, a star for you. That is very important issue.
RE: Hysys - Dew/Bubble point
STREAM CRITICAL TEMPERATURE (KAY'S RULE) F -338.77
STREAM CRITICAL PRESSURE (PRAUSNITZ-GUNN) PSIA 305.91
RE: Hysys - Dew/Bubble point
try to set the graph cotrol and to enlarge the temperature and pressure axis until the tow curves appeare.
RE: Hysys - Dew/Bubble point