ITK-234 Termodinamika Teknik Kimia II

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

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

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:

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

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

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

Modified Raoult’s Law: Wilson Equation for calculating  (Cont’)
Use your diagram to answer there questions:

Modified Raoult’s Law: Wilson Equation for calculating 

Modified Raoult’s Law: Wilson Equation for calculating 

Modified Raoult’s Law: Wilson Equation for calculating 

Modified Raoult’s Law: Wilson Equation for calculating 

Modified Raoult’s Law: Wilson Equation for calculating 

Modified Raoult’s Law: Wilson Equation for calculating 

Modified Raoult’s Law: Wilson Equation for calculating 

Modified Raoult’s Law: Wilson Equation for calculating 

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

Modified Raoult’s Law: NRTL Equation for calculating 

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

Estimating Azeotrophic Condition, Use No Diagram

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

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

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

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:

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:

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

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

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

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

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

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

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