![]() ![]() Such a “three-phase” flash with water is not included here. If significant amounts of water are present, more complex procedures are required. A method for calculating equilibrium flash vaporization to produce two, primarily, hydrocarbon, phases is given by the following steps. This, however, should not be used for any definitive design work nor in systems which have azeotropes or are near their critical conditions. A rough and ready substitute for K factors is to use the vapor pressure of the component divided by the system pressure. Others may be found in engineering data books such as “Gas Processors Suppliers Association” (GPSA) which are based on convergence pressures. Among these are the charts in Maxwell’s Data Book on Hydrocarbons which are based on fugacities. There are several publications giving values for K. ![]() ![]() The flash calculations can be done using a process simulation program employing appropriate thermodynamic models or manually using a spreadsheet. K = Equilibrium constant for each component at the temperature and pressure of the flash V/ L = Ratio of total moles vapor to total moles liquid Xf = Moles/hr of the component in the feed L = Total moles/hr of a component in the liquid phase ![]()
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