Application of phase rule to three component system

Guided by Presented by Dr.Laxmi Tantuvay Gayatri Muchhala

PHASE

COMPENT

DEGREE OF FREEDOM

any homogeneous distinct part of a system which is mechanically separable and bounded by a definitesurface

example:-ice (s)=H2O

water( l )=H2O

Vapour(g)=H2O

The smallest number of independently variable constituent by means of which the composition of each can be represent by means of a chemical equation

Ex.. In water vapour and ice system .there is only one component present in this because H and O can not varied independently so it is a one component system

The number of variable factor such as temperature pressure or concentration which must be arbitraly fixed in order to define the system completely

Example:-a gases mixture of two gases C02 and N2 in equilibrium to defined this system three variable viz, composition (35%co and 65% N2)temp. 40degree and pressure 760mm are required to be arbitrarily fixed hence the system has three degree of freedom

One component system

Two component system

Three component system

Phase rule for one component system

F=C-P+2

F=1-P+2

F= 3- P

Here maximum degree of freedom can be only 2

Phase rule when apply in two component system

F=C-P+2

F=2-P+2

F= 4 – P

Here maximum degree of freedom is three

According to phase rule ,the degree of freedom in a three component system in three component

system is given by,

F=c-p+2

F=3-p+2

F = 5+ P

point at which all the phases are stable together is known as quintuple point

The variation in concentration of the three component mixture is expressed by means of triangular diagram The representation of compositions in a three-component

Formation of one pair of partially miscible liquids.

Formation of two pairs of partially miscible liquid

Formation of three pairs of partially miscible liquids

System of water, phenol ,aniline

Formation of three pairs of partial miscible liquid