PVTsim convert C6+ to C7+

[motaleby]

From PVTsimHelp (v.19 page 14-15):

C6+ compositions are not legal input but may be entered using the below procure manually converting the C6+
composition into a C7+ composition and calculate C6 mol% and C7+ mol% and properties as

• C6 mol% = C7 mol% ×P-fraction of C7 = 2.637 ×0.527 = 1.389

• C7+ mol% = C6+ mol% - C6 mol% = 21.143-1.389 = 19.75

• C7+ Mw = (C6+ mol%×C6+ mol wgt - C6 mol% ×C6 molwgt)/(C7+ mol%) = (21.143×191.7-
1.389×86.178)/19.754=199.1

• C7+ density= (C6+ mol%×C6+ mol wgt - C6 mol% xC6 molwgt) / ((C6+ mol%×C6+ mol wgt)/(C6+
density) - (C6 mol% ×C6 molwgt)/(C6 density)) = (21.143×191.7-
1.389×86.178)/(21.143×191.7/0.840-1.389×86.178/0.6640)=0.8468 g/cm3


I want to know where the C7 mol% (2.637) has come from



---

[motaleby]

The answer is here:

Enter the fluid composition as it's shown in the second table of page 14. Then go to CharFluid\ Edit Current

Below the iC5 you'll see the C7, C8, C9, C10-11,..., C33-80. you can use the C7 %mol (2.636) and scroll to the right to find P-fraction (0.527)



---