Preferability Regions for Ternary Mixtures

Depending on the composition of the mixture under separation, this or that separation flowsheet is preferable. Many researchers investigated the location of preferability regions in the concentration triangle. 

The comparison of sequences with direct and indirect separation in the first column, with three columns, with prefractionator and complex colunm, and of Petlyuk column (Figs. 8.1 and 6.12c, d) was made in the works (Petlyuk Platonov, 1965 Petlyuk et al., 1965). The summary flow rate of vapor V and expenditures of energy of separation W were used for estimation of the expenditures. 

The comparison of various distillation complexes and of ordinary flowsheets is given in Tedder and Rudd (1978). Columns with side strippings and side rectifiers, Petl50ik columns, flowsheet with prefracionator, and also some other feasible configurations of two columns were examined. It was shown, in particular, that Petlyuk columns are preferable at big content of average volatile component. 

In the monograph (Stichhnair Fair, 1998), the preferability regions in concentration triangle for mixture 2.2-dimethylbutane(A)-2-dimethylpentane(5)-hexane(Q(relative volatilities = 1-887 and obc = 1-329) were shown. The comparison was made in accordance with summary vapor flow V. The flowsheets with a minimum number of simple columns, with three columns, and with 

It was shown in other works (Agrawal Fidkowski, 1998) that, while estimating the expenditures by summary vapor flow V, the region of preferability of Petlyuk columns occupies the whole area of the concentration triangle. 

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