Regression equations and coefficients for various versions of the GPA convergence-pressure charts are available from the GPA. įor a temperature of 100☏, the convergence pressure is approximately 2,500 psia (dotted line) for the pseudo system methane-n-pentane (see Figure 8-3C). For n-pentane at convergence pressure of 3,000 psia (nearest chart) the K-value reads 0.19. The DePriester charts check this quite well (see Figures 8-4A and B, and Figure 8-3D). Ī feed to a column has the composition given in the table below, and is at a pressure of 14 bar and a temperature of 60☌. Calculate the flow and composition of the liquid and vapour phases. Take the equilibrium data from the Depriester charts given in Chapter 8. Įquilibrium constants were taken from the Depriester charts (Chapter 8). To obtain the composition of the top and bottom products, first calculate the relative volatility of each component using the conditions of the feed as a first guess.
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