UNIFAC group contribution method activity calculator function

Calculate the activity of the chemicals in a mixture

Developer: Saeed Mardani
This code is calculating the UNIFAC group contribution method for mixtures
It can be used in estimation of activity coefficients of mixtures.
This code was developed as a part of a larger program developed in
MATLAB(R)during 2017 in Aalto University.

This code can be used as an open source software by developers.
I do not accept any responsibility concerning the problems may happen by
using this code!

THIS EXAMPLE WAS AVAILABLE IN PAGE 295 OF THE BOOK: Gmehling, J., Kolbe, B., Kleiber, M., Rarey, J., 2012. Chemical Thermodynamics for Process Simulation, 1st ed. Wiley-VCH:
Example 5.22: Calculate the VLE of the system n-hexane (1)-2-butanone (2) at 60 'C for a mole fraction of x1 = 0 . 5 with the help of the UNIFAC method assuming ideal behavior of the vapor phase.

THIS EXAMPLE WAS IMPLEMENTED IN MATLAB TO CALCULATE THE UNIFAC GROUP CONTRIBUTION METHOD, LATER, THIS CODE WAS USED TO CALCULATE THE
ACTIVITY COEFFICIENTS FOR 6 COMPOUNDS AVAILABLE IN A MIXTURE WHICH WAS PERFORMING WELL.