This Demonstration applies a DePriester chart a set of nomograms to find the vaporliquid equilibrium ratio the gas phase mole fraction divided 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 K (or DePriester) Chart (low T range) in American Engineering Units. The K-value is where the green line intersects the curve for propane (K = 0.8). The green line connects these two points. Use the sliders to set the pressure and temperature. Here is an example of how to use a DePriester chart for propane at 70 psia and 20 ☏: 1.
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