Bidimensional map representation

22 Bidimensional map with one formulation variable and one composition variable 

In many cases, particularly when mixtures of polyethoxylated non-ionic surfactants are used, or for WOR different from unity, the three-phase region is distorted (see Figs. 1.8 and 1.10 in Chapter 1). This is a practical problem for the formulator because it means that the optimum formulation or temperature (dashed line at the centre of the three-phase zone) depends on the surfactant concentration, an inconvenience in many applications, since formulation is likely to be altered by the dilution of the system. This formulation-composition diagram, particularly the location of the X point, varies when 

Another common case of bidimensional representation is a map of the phase behaviour versus two composition variables, while all formulation variables are kept constant. This is generally represented in a triangular diagram. If the three components are pure products, there are essentially the three Winsor s types of diagrams as in Fig. 1.2 (Chapter 1), the formation of which depends on the formulation variables. Winsor type III diagram correspond to the so-called optimum formulation situation in which there is a zone in which three phases coexist over some range of composition. 

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