![]() ![]() Every liquid has vapor pressure Physical property Vapor pressure is a function of temperature A liquid boils when vapor pressure = system pressure.Partial pressure of vapor in the gas phase in equilibrium with pure liquid is equal to its vapor pressure at the system temperature. ![]() 푥푥푖푖is mole fraction of component 푖푖 liquid mixture DePriester chart: 푲푲 values for light hydrocarbons 푃푃푖푖표표is vapor pressure of component 푖푖 at system temperature 푝푝푖푖is partial pressure of component 푖푖 in gas phase END or go to step 2 if you want to repeat for another 푃푃푇푇 or, read 퐾퐾퐴퐴, 퐾퐾퐵퐵 from DePriester chart See page 3 for the equations Approximate equation for binary equilibrium Read K values methane, ethylene, iso-propane and n-octane at 200 kPa and 50 oC Algorithm for phase equilibrium data calculation from vapor pressure or DePriester chart Illustrated for a binary mixture, but the alogorithm can be exteded to n components 1.Initialize: 푥푥퐴퐴= 0 푃푃푇푇 = 0 ∆ 1 = 0.05 ∆ 2 = 760 mmHg 2.푃푃푇푇 = 푃푃푇푇+∆ 2 3.푥푥퐵퐵 = 1− 푥푥퐴퐴 4.Guess 푇푇 5.Calculate 푃푃퐴퐴표표 & 푃푃퐵퐵표표 from Eq (1) 6.Calculate 퐾퐾퐴퐴& 퐾퐾퐵퐵 from Eq (4) 7.Calculate 푦푦퐴퐴&푦푦퐵퐵 from Eq (2) 8.Check if Eq (3) is satisfied. ![]()
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