![]() ![]() The K values thus obtained depend on pressure and temperature of the multicomponent system and not on concentration.Ĭoncentration-dependent K values can be calculated from empirical correlations involving lengthy calculations or from equations of state using commercial software because hand calculations are unwieldy. Depriester nomographs can be used to obtain estimates of K values. This article also explains the first principles for calculating K values from fugacity of real gases and liquids.Ī K value is required whenever one designs a distillation column or assesses the performance of an operating column. The proposed method, therefore, requires looking up only one chart-the generalized fugacity chart (which is a well-spaced-out chart and can be read accurately) and the rest of the calculations use equations, thus enabling rapid calculation. The method is based on the generalized fugacity charts of Lewis, Kay, and Newton, and uses reduced temperatures and pressures as parameters.Ī third-degree polynomial is prepared from Lu’s chart for calculating liquid molarity, which is used for calculating liquid phase fugacity from fugacity of saturated liquid. A new method to estimate equilibrium phase distribution ratios (K values) improves on the shortcomings of older methods. ![]()
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