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ITK-234 Termodinamika Teknik Kimia II Dicky Dermawanwww.dickydermawan.net78.netdickydermawan@gmail.com VLE Calculations for Nonideal Mixtures

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Modified Raoults Law K-value Method VLE using Equation of States Dicky Dermawan

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Incorporation of fugacity and activity coefficient to vle criteria results: Modified Raoults Law: where However, at low pressure (up to at least 1 bar): The Poynting Factor 1

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Modified Raoults Law: Wilson Equation for calculating a. Prepare a P-x-y diagram at 80 o C b. Prepare a t-x-y diagram at 101,33 kPa

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Modified Raoults Law: Wilson Equation for calculating (Cont) Use your diagram to answer there questions: Given P = 70 kPa, T = 80 o C & overall composition, z 1 =30% Find the fraction of system which is liquid (L) & vapor (V) and their respective compositions x i & y i

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Modified Raoults Law: Wilson Equation for calculating a. Prepare a P-x-y diagram at 80 o C b. Prepare a t-x-y diagram at 101,33 kPa

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Modified Raoults Law: Wilson Equation for calculating (Cont) Use your diagram to answer there questions:

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Modified Raoults Law: Wilson Equation for calculating

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Modified Raoults Law: NRTL Equation for calculating a. Prepare a P-x-y diagram at 80 o C b. Prepare a t-x-y diagram at 101,33 kPa

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Modified Raoults Law: NRTL Equation for calculating

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VLE Calculation Using No Diagram Answer the questions (a) through (e) from 12.6 to 12.13 but dont use the phase diagram to obtain the answers

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Estimating Azeotrophic Condition, Use No Diagram

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K-Value Method: Using De Priester Charts for light hidrocarbons The nomographs K = f(T,P) prepared by De Priester provide easy application of this approach to practical problem

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K-Value Method K-Value Method: Using De Priester Charts for light hidrocarbons High Temperature Range

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K-Value Method: K-Value Method: Using De Priester Charts for light hidrocarbons Low Temperature Range

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Type of Phase Equilibria Calculations BUBL P calculation: Given T & liquid composition x i, Find the bubble point P b & vapor composition DEW P calculation: Given T & vapor composition y i, Find the bubble point P b & vapor composition Assume P, find K i satisfying:

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Type of Phase Equilibria Calculations BUBL t calculation: Given P & liquid composition x i, Find the bubble point P b & vapor composition DEW t calculation: Given P & vapor composition y i, Find the bubble point P b & vapor composition Assume t, find K i satisfying:

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K-Value Method: Using De Priester Charts for light hidrocarbons

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Type of Phase Equilibria Calculations FLASH calculation: Given P, T & overall composition, Find the fraction of system which is liquid (L) & vapor (V) and their respective compositions x i & y i Make sure P located between P b dan P d, i.e. Perform BUBL P for z i =x i and Perform DEW P for z i = y i Find K i ; assume V satisfying: or: or: The General Solution Procedure

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K-Value Method: Using De Priester Charts for light hidrocarbons

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