………first we need to know whether the system is actually two-‐phase. K-value equation to predict bubble pressure for reservoir fluids by changing the parameter P ci /P in.
#Depriester chart bubble p trial
Solution is by trial and error.! Guess V until the summation term equal to 1.! But………! DePriester 5 presented K-value charts for light. Public users are able to search the site and view the abstracts and keywords for each book and chapter without a subscription. Ki are tabulated in a chart called the DePriester chart.īUBL P: Calculate composition of vapor !Īs derived for VLE system, zi K i yi = 1 + V (K i − 1) Access to the complete content on Oxford Reference requires a subscription or purchase. K-‐value Using DePriester Chart For light hydrocarbon mixture (commonly found in industry), Ki is essentially function of T and P only. Pi sat Ki = P If Modified Raoult’s Law is valid, Φˆi yi P = γ i xi f i yi P = γ i xi Pi sat compositions in the form of equations, tables or graph such as the DePriester charts. Modified Raoult’s Law φˆi = 1 For ideal-‐gas mixture in equilibrium with non-‐ideal liquid solu6on where P and T are the temperature and pressure for each phase. Raoult’s Law For ideal gas vapor mixture in equilibrium with ideal liquid solu6on equation becomesĪnd also for pure species in equlibrium and ideal gas vapor, f i = f i l = f i v = P = Pi sat we get, Where, φˆi fugacity coefficient species i in gas mixtureĪctivity coefficient of species i in liquid solution Consider a multicomponent system in a VLE! condition, the fugacity (to be defined in Chapter 11) ! of species i for each phase is given by,! v ˆ fi = φˆi y i P For vapor mixture ˆl = γ x f f For liquid solution! i i i i VLE criteria (to be shown/derived in chapter 11), fˆ l = fˆ v i
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