Acetone-benzene-chloroform mixture locations

For a mixture of acetone(l)-benzene(2)-chloroform(3)-toluene(4), determine the location of the boundary between distillation regions. 

The example of tangential pinch for four-component mixture is quasisharp separation of azeotropic mixture acetone (l)-benzene (2)-chloroform (3)-toluol (4) of composition Xf (0,350 0,250 0,150 0,250) at intermediate split 1,3(2) 2,4(3) (admixture components heavy and light key are in brackets correspondingly) at the following composition the products xd (0,699 0,001 0,300,0) and xb (0 0,500 10 0,500). The same top product composition, as in the previous example (Fig. 5.18b) of separation of three-component mixture in the top section, is accepted for convenience of analysis. In this case, the boundary elements of top section trajectory bundle, located in face 1-2-3, completely coincides with top section trajectory bundle at separation of previously mentioned three-component mixture. 

This is the most common type of system in extraction, and typical examples are water (A)-chloroform (B)-acetone (C) and benzene (A)-water (B)-acetic acid (C). The triangular coordinates are used as isotherms, or diagrams at constant temperature. Refer to Fig. 10.3a. Liquid C dissolves completely in A and B, but A and B dissolve only to a limited extent in each other to give rise to the saturated liquid solutions at L (A-rich) and at K (B-rich). The more insoluble the liquids A and B, the nearer the apexes of the triangle will points L and A" be located. A binary mixture /, anywhere between L and K, will separate into two insoluble liquid phases of compositions at L and A, the relative amounts of the phases depending upon the position of J, according to the principle of Eq. (10.1). 

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