DENSITY OF HYDROCARBONS (SPECIAL CASE)

Gas real (Pressure > 3 atm), you know the formula of density is :

P : atm R : 0.082 T : °K M :gr

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. (y_HC is fraction molar of gas).

where        z is the average compressible factor

                 z_HC 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 z_{HC :} (this is the only change)

In order to computer it you need to have value :

Tr : reduce temperature Pr : reduce pressure TcHC critical or seudo-critical temperature PcHC critical or seudo-critical pressure yHC fraction molar of hydrocarbon

	PcHC critical or seudo-critical pressure Pci critical pressure of each hydrocarbons compound yi is the fracction molar of each hydrocarbons compound
	TcHC critical or seudo-critical temperature Tci critical temperature of each hydrocarbons compound yi is the fracction molar of each hydrocarbons compound