Validity of Ideal Gas EOSUsing generalized correlations for gasses

Jordan Orsak

Lance Brockway

Bryan Hinson

Philip Brown

When can you use it?

The Ideal-gas equation may be used as a reasonable approximation of reality when Z0 lies between .98 and 1.02

Checking the Validity of an Ideal Gas Assumption

Look at the specific molar volume of the gas. The ideal gas equation is good to within about 1% if:

Example

Generalized Correlations for Liquids

This correlation is most suitable for nonpolar and slightly polar fluids. For estimation of molar volumes of saturated liquids.

Rackett:

Alternate:

Generalized Correlations for Liquids Cont.

Lydersen, Greenkorn, and Hougen’s two-parameter correlation for liquid volumes.

is reduced density

is density at the critical point

Generalized Correlations for Liquids Cont.

Using a single known liquid volume:

V2 = required volume

V1 = known volume

= reduced densities from figure 3.16

Generalized Density Correlation for Liquids

Example

Works Cited

J.M. Smith, H. C. Van Ness and M. M. Abbot, Introduction to Chemical Engineering Thermodynamics (7th ed. McGraw-Hill, New York, 2005). Pg. (104-111).

Felder, R.M. and R.W. Rousseau, Elementary Principles of Chemical Processes, 2nd Edition, John Wiley, 1986, pp. 193-208. <http://www.cbu.edu/~rprice/lectures/realgas.html>.