##### 1.5 Distribution coefficients

Raoult's law can also be represented by using the distribution coefficients. They are indicated with k_{A} and k_{B} and equal to:

k_{A} = y_{A} / x_{A} = P_{A}^{v} / P ;

k_{B} = y_{B} / x_{B} = P_{B}^{v} / P ;

The distribution coefficients are strongly dependent on the temperature since P_{A}^{v} and P_{B}^{v} are dependent on the temperature according to the **Antoine equation**:

ln P_{i}^{v} = A - B / (T[?K] + C)

where A, B, C are specific constants for each pure compounds and can be easily found in the literature (i.e. Perry's Chemical Engineers' Handbook).

For the component i, it is then:

P_{i}^{v} = P_{i}^{v} [T]

k_{i} = k_{i} [T]