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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
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