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Unit Operations Handbook: Volume 1 (In Two Volumes). each component (hydrocarbon) of oil according to the De-Priester chart. ↑ "Pbub and Pdew calculation based on the DePriester chart for a fast pyrolysis and hydrotreating process". stage of separation at the installation of preliminary water discharge and oil.Read this K-value off the chart (approximately 21.3). All of these provide useful guideposts to the user, while the slide rule is intended to be a general-purpose device, a nomogram is designed to perform a specific calculation, with tables of values effectively. Note where the line crosses the methane axis. Manometric units such as the centimetre of water, millimetre of mercury, Depriester chart is the amount of force acting per unit area.Connect the points with a straight line.On the right-hand vertical axis, locate and mark the point containing the temperature 60☏.On the left-hand vertical axis, locate and mark the point containing the pressure 100 psia. using the Depriester chart (b) Calculate the compositions of the liquid and vapor for a.Exampleįor example, to find the K value of methane at 100 psia and 60 ☏. Many DePriester charts have been printed for simple hydrocarbons. "K" values, representing the tendency of a given chemical species to partition itself preferentially between liquid and vapor phases, are plotted in between. These nomograms have two vertical coordinates, one for pressure, and another for temperature. DePriester in an article in Chemical Engineering Progress in 1953. DePriester Charts provide an efficient method to find the vapor-liquid equilibrium ratios for different substances at different conditions of pressure and temperature.