Environmental Chemical Engineering

Observations. So far we have dealt with defining the conditions of acrobatics substances in contact with each other and interact as the various properties in the same conditions of mixing. Obviously, to use mathematical systems, we must make a working assumption, first of all, the condition of "ideal mix." This requires us to consider having the two substances which will form the mixture (A + B) as a counterpart, that is "chemically similar".

Relative volatility. In the wake of the previous comments you can reach the definition of a very important parameter in studying the behavior of mixtures. We start from the following Clausius-Clapeyron relation:

(1) ;

you can see that with increasing temperature it is diminizione (linear) of the logarithm of vapor pressure. Two substances are defined when their straight counterparts of the vapor pressure in logarithmic scale are parallel, that we have that the ratio ( ) Between the vapor pressures and costs (or rather weakly dependent on temperature). This report defines "relative volatility"

(2) ;

The more (2) differs from 1, A is more volatile B.

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