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ITK-234 Termodinamika Teknik Kimia II Dicky VLE Calculations for Nonideal Mixtures.

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Presentation on theme: "ITK-234 Termodinamika Teknik Kimia II Dicky VLE Calculations for Nonideal Mixtures."— Presentation transcript:

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

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

3 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

4 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

5 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

6 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

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

8 Modified Raoults Law: Wilson Equation for calculating

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16 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

17 Modified Raoults Law: NRTL Equation for calculating

18 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

19 Estimating Azeotrophic Condition, Use No Diagram

20 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

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

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

23 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:

24 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:

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

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27 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

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

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