Fugacity: It is derived from Latin, expressed as fleetness or escaping ...

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Fugacity coefficient ( ) : Fugacity coefficient ids defined as the ratio of fugacity of a component to its pressure. f P Is the measure of non ideal behavior of the gas. Standard State: Pure gases, solids and liquids at temperature of 298k at 1 atmosphere are said to exist at standard condition. The property at this condition are known as standard state property and is denoted by subscript’o’. o G = Standard Gibbs free energy o f = Standard fugacity Estimation of fugacity for gases I method dG VdP SdT For Isothermal conditions dG VdP from equation (2) RTd ln f VdP V d ln f dP RT Integrating the above equation with the limits 0 to f and pressure 1 to P d ln f P 1 V RT dP Lower limit is taken as P =1 atm At 1 atm assuming the gases expected to behave ideally P 1 ln f VdP RT 1 if PVT relations are known , we can find fugacity at any temperature and pressure
II method Using compressibility factor dG VdP RTd ln f VdP --------------(2) V in terms of compressibility terms it is given as V Substitute V in equation 2 ZRT RTd ln f dP p d ln f Zd ln p subtracting both sides by dlnP d ln f d ln P Zd ln P d ln P f d ln ( z 1) d ln P P d ln ( Z 1) d ln P Integrating the equation from 1 to and 0 to P 1 d ln P P 0 ( Z 1) d ln P dP ln ( Z 1) P 0 ZRT P Using generalized charts: using reduced properties a similar chart as compressibility chart is predicted for fugacity. f Z 1 ln dPr P P r
Page 1: Fugacity: It is derived from Latin,
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Page 17 and 18: For binary solution G x11 x2 2 Ef
Page 19 and 20: i P T , n V i This equation
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Page 23 and 24: For non ideal solutions f i i xik
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Page 29 and 30: dP dT T Q V V g l Vg>>>Vl (Gas
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Page 35: Non ideal solution An ideal solutio
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Page 40 and 41: For binary mixture P x P 1 1 1 V1
Page 42 and 43: A=0.829 B x ln 1 1 ln 2 1 x2
Page 44 and 45: According to Gibbs Duhem equation b
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Page 48 and 49: differentiating with respect to x1
Page 50 and 51: CHEMICAL REACTION EQUILIBRIUM Energ
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H T T T 0 H T 0 2 H298
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EFFECT OF TEMPERATURE ON EQUILIBRIU
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o 2 3 0.00975 2 H T T T I 5.
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0 0 G298 We have G 298= -RTln K298
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Effect of variables on equilibrium
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y K K K K P c c y n C
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