Description

Given the molar masses and polarities of two compounds, as well as the operation temperature and pressure, calculates the diffusivity coefficient by the Brokaw's equation:

$$ Dab = \frac{1.858.10^{-3}.T^\frac{3}{2}.{(\frac{1}{Ma}+\frac{1}{Mb})}^{\frac{1}{2}}}{PΩdσab^2}; $$

Been:

• A: as the first chemical compound inserted, which is difusive in B;
• B: as the second chemical compound inserted, which is the diffusive environment.

The Brokaw's equation uses the Hirschfelder's equation with alteration in the colision diameter and the colision integral:

• Modified colision integral is given by:

$$ Ω_D = Ω^D + \frac{0,196.S{AB}^2}{T^} $$

• Modified colision diameter is given by:

$$ σ_{AB} = {σ_A.σ_B}^{\frac{1}{2}} $$