DENSITY OF HYDROCARBONS (SPECIAL CASE)
Gas real (Pressure > 3 atm), you know the formula of density is :
However, if you want to estimate the density of mixture, it is possible you would introduce some correction.
When you have in the mixture, vapor of water, H2, O2, N2 etc, you need to considerate the hydrocarbons below a pressure equal instead of . This change affected only the compute of compressible factor. (yHC is fraction molar of gas).
where z is the average compressible factor
zHC is the average compressible factor below a pressure equal
z1, z2 is the compressible factor of compound 1, 2
y is the fraction molar of each compound.
Compute zHC : (this is the only change)
In order to computer it you need to have value :