Coordinates, Janecke triangular

Figure 14.1. Equilibria in a ternary system, type 1, with one pair of partially miscible liquids A = 1-hexene, B = tetramethylene sulfbne, C = benzene, at 5(TC (JR.M. De Fre, thesis, Gent, 1976). (a) Equilateral triangular plot point P is at 20% A, 10% B, and 70% C. (b) Right triangular plot with delines and tieline locus, the amount of A can be read off along the perpendicular to the hypotenuse or by difference, (c) Rectangular coordinate plot with tieline correlation below, also called Janecke and solvent-free coordinates.

Evaluation of the numbers of stages also can be made on rectangular distribution diagrams, with a McCabe-Thiele kind of construction. Example 14.5 does this. The Janecke coordinate plots like those of Figures 14.1 and 14.2 also are convenient when many stages are needed, since then the triangular construction may... 

Triangular diagrams, such as Fig. 10.5-1, can be uned to cany am equilibrium-stage leaching calculations in the same way that analogous calculations are ceiried out for ternary liquid-liquid extractions.1 3 Other coordinate systems, for example, Janecke coordinates, can also be used for such calculations. 

On the Janecke diagram, as on triangular coordinates, if a mixture at 0 is added to one at P, the resulting mixture K will be on the straight line OPy and the weights are in the follow ing relationship ... 

Eng. Chem. 33,1240 (1941)]. Calculations will be made on triangular and Janecke coordinates. 

Janecke Coordinates (10). Because of crowding on the triangular coordinates, the rectangular plot of Janecke is particularly useful for this case since the calculator is not limited to the single size of graph paper... 

The Janecke diagrams for both of the cases just described are obvious from the description of the triangular coordinate construction and need no additional explanation. See also the following illustration. 

Plot the binodal curve and tie lines and (a) triangular coordinates and (h) rectangular coordinates of Janecke. 

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