PA0(T)PTOTALactivity coefficient fugacity coefficient vapor pressure Bubble point calculation for multi-component mixtures Trial-and-error method Given the composition of a subcooled liquid and PTOTAL,find Tbp and (yi)bp VLE: mole balance: yi Kixiyii1.0Algorithm: 1. If not, pick a new temperature, repeat How to pick a temperature? How to pick the next temperature? To achieve rapid convergence: Initial guess:(weighted average of boiling points of pure components) T ziTii(Ki 1)KA(Tnext) KA(Tprev)(yi)previNext guess: pick a reference component (A) find Tnext using DePriester Chart Dew point calculation for multi-component mixtures Trial-and-error method Given the composition of a superheated vapor and PTOTAL,find Tdp and (xi)dp VLE: mole balance: xi yiKixii1.0Algorithm: 1.
Pick a temperature T and find the corresponding Ki(T) values for each component 2.
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