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**ITK-234 Termodinamika Teknik Kimia II**

VLE Calculations for Nonideal Mixtures Dicky Dermawan

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**Modified Raoult’s Law K-value Method VLE using Equation of States**

Dicky Dermawan

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**Modified Raoult’s Law:**

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

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**Modified Raoult’s Law: Wilson Equation for calculating **

Prepare a P-x-y diagram at 80oC Prepare a t-x-y diagram at 101,33 kPa

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**Modified Raoult’s Law: Wilson Equation for calculating (Cont’)**

Use your diagram to answer there questions: Given P = 70 kPa, T = 80oC & overall composition, z1=30% Find the fraction of system which is liquid (L) & vapor (V) and their respective compositions xi & yi

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**Modified Raoult’s Law: Wilson Equation for calculating **

Prepare a P-x-y diagram at 80oC Prepare a t-x-y diagram at 101,33 kPa

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**Modified Raoult’s Law: Wilson Equation for calculating (Cont’)**

Use your diagram to answer there questions:

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**Modified Raoult’s Law: Wilson Equation for calculating **

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**Modified Raoult’s Law: Wilson Equation for calculating **

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**Modified Raoult’s Law: Wilson Equation for calculating **

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**Modified Raoult’s Law: Wilson Equation for calculating **

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**Modified Raoult’s Law: Wilson Equation for calculating **

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**Modified Raoult’s Law: Wilson Equation for calculating **

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**Modified Raoult’s Law: Wilson Equation for calculating **

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**Modified Raoult’s Law: Wilson Equation for calculating **

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**Modified Raoult’s Law: NRTL Equation for calculating **

Prepare a P-x-y diagram at 80oC Prepare a t-x-y diagram at 101,33 kPa

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**Modified Raoult’s Law: NRTL Equation for calculating **

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**VLE Calculation Using No Diagram**

Answer the questions (a) through (e) from 12.6 to but don’t 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: Using De Priester Charts for light hidrocarbons**

High Temperature Range

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**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 xi, Find the bubble point Pb & vapor composition DEW P calculation: Given T & vapor composition yi, Assume P, find Ki satisfying: Assume P, find Ki satisfying:

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**Type of Phase Equilibria Calculations**

BUBL t calculation: Given P & liquid composition xi, Find the bubble point Pb & vapor composition DEW t calculation: Given P & vapor composition yi, Assume t, find Ki satisfying: Assume t, find Ki satisfying:

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

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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 xi & yi Make sure P located between Pb dan Pd, i.e. Perform BUBL P for zi =xi and Perform DEW P for zi = yi Find Ki ; 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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**K-Value Method: Using De Priester Charts for light hidrocarbons**

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

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