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Take the equilibrium data from the Depriester charts given in Chapter 8. Calculate the flow and composition of the liquid and vapour phases. 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☌. The DePriester charts check this quite well (see Figures 8-4A and B, and Figure 8-3D). For n-pentane at convergence pressure of 3,000 psia (nearest chart) the K-value reads 0.19. 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). Regression equations and coefficients for various versions of the GPA convergence-pressure charts are available from the GPA.
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The widespread availabihty and utihzation of digital computers for distillation calculations have given impetus to the development of analytical expressions for i regression equation and accompanying regression coefficients that represent the DePriester charts of Fig. It is analogous to the critical point for a pure component in the sense that the two. An alternative measure of composition is the convergence pressure of the system, which is defined as that pressure at which the Kvalues for aU the components in an isothermal mixture converge to unity. The Kellogg and DePriester charts and their subsequent extensions and generahzations use the molar average boiling points of the liquid and vapor phases to represent the composition effect. SI versions of these charts have been developed by Dadyburjor. For K as a function of T and P only, the DePriester charts provide good starting values for the iteration. One cannot calculate K values until phase compositions are known, and those cannot be known until the K values are available to calculate them.
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Ī trial-and- error procedure is required with any K-value correlation that takes into account the effect of composition. The Kellogg charts, and hence the DePriester charts, are based primarily on the Benedict-Webb-Rubin equation of state, which can represent both the liquid and the vapor phases and can predict K values quite accurately when the equation constants are available for the components in question.
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These charts are a simplification of the Kellogg charts and include additional experimental data. The easiest to use are the DePriester charts, which cover 12 hydrocarbons (methane, ethylene, ethane, propylene, propane, isobutane, isobutylene, /i-butane, isopentane, /1-pentane, /i-hexane, and /i-heptane). For example, several major graphical i light-hydrocarbon systems. However, for mixtures of compounds of similar molecular structure and size, the K value depends mainly on temperature and pressure. 4, the i complex function of temperature, pressure, and equilibrium vapor- and hquid-phase compositions. Lesson5_Exercise4_Tom Smith).As discussed in Sec. Make sure that your name is in the document title before uploading it to the correct assignment (i.e.Find the Exercise 4 assignment in the Lesson 5 Module by either clicking Next until you find it or by clicking Assignments and scrolling down until you find it.
#DEPRIESTER CHART CALCULATOR PDF#
Once you have a solution to the exercises you will submit your answers as a PDF by uploading your file to be graded. The rest should be type-written for ease of reading when grading. The scanned pages should relate to using the graphs for solving the problem. Important Note: You may submit scanned images or clear handwritten pages as a PDF that is less than 2 MB in size for this exercise. Submit your answers as a PDF in the Exercise 4 assignment inside the Lesson 5 Module, showing all the steps in your calculations, indicate the K values you read from the nomograms, and state your assumptions, if any. Would the summer, or winter asphalt product be “heavier”? Explain why. Explain which of the following switches will take place in the refinery in about a month, and why? 40 ptsĪ) Switch the deasphalting solvent from propane to pentane.ī) Switch the deasphalting solvent from pentane to propane. In late fall this refinery switches operations to produce more fuel oil from VDR for the coming winter months, producing still some asphalt, but in lower quantity. A refinery in Northwest Pennsylvania produces asphalt as an important product that brings revenue, particularly during the summer months.