DePriester Chart for Hydrocarbons

methane

propane

n-decane

pressure (psia)

30

temperature (°F)

140

This Demonstration applies a DePriester chart, a set of nomograms to find the vapor-liquid equilibrium ratio (the gas phase mole fraction divided by the liquid phase mole fraction, known as the

K

-value) for a series of hydrocarbons. Select one of three hydrocarbons: methane, propane or

n

-decane. Use sliders to change the pressure and temperature; a green line connects these two points. The green circle indicates where to read the

K

-value on the chart, which is also displayed above the chart. The

K

-values for other hydrocarbons can also be read from the chart.

Details

Here is an example of how to use a DePriester chart for propane at 70 psia and 20 °F:

1. Use the sliders to set the pressure and temperature.

2. The green line connects these two points.

3. The

K

-value is where the green line intersects the curve for propane (

K=0.8

).

References

[1] J. M. Smith, H. C. Van Ness and M. M. Abbott, Introduction to Chemical Engineering Thermodynamics, 7th ed., Boston: McGraw-Hill, 2005.

Permanent Citation

Majed N. Aldossary, Rachael L. Baumann, John L. Falconer

"DePriester Chart for Hydrocarbons"
http://demonstrations.wolfram.com/DePriesterChartForHydrocarbons/
Wolfram Demonstrations Project
Published: October 19, 2016