Pseudo-binary phase diagrams

Drawing pseudo-binaryjy—x phase diagrams for the mixture to be separated is the easiest way to identify the distillate product component. A pseudo-binary phase diagram is one in which the VLE data for the azeotropic constituents (components 1 and 2) are plotted on a solvent-free basis. When no solvent is present, the pseudo-binaryjy—x diagram is the tme binaryjy—x diagram (Eig. 8a). At the azeotrope, where the VLE curve crosses the 45° line,... 

FIGURE 7.10 Pseudo-binary phase diagram of the water, HNO3/DMDBTDMA, dodecane system to identify the third-phase limit. Experimental points (circles) and theory (lines) obtained from Baxter sticky hard-sphere approach. The theoretical line is obtained with the experimental determination of the linear variation of the stickiness parameter tt1 versus [HN03]/[DMDBTDMA]. The different lines illustrate the impact of the error in this T-1 experimental linear law. (From C. Erlinger, L. Belloni, T. Zemb, and C. Madic, Langmuir, 15 2290-2300, 1999. With permission). 

The determination of was examined by first considering the liquid solution behavior and then the solid mixture properties. The liquid phase properties are typically determined by using a solution model to interpolate between the binary limits. In general, the use of only the binary phase diagrams in the data base for model parameter estimation does not give good values for the ternary liquid mixture properties. The solid solution behavior is normally determined from an analysis of the pseudo-binary phase diagram. Extrapolation of the solid solution behavior determined in this manner to lower values of temperature should be undertaken with caution. 

Figure 9. A pseudo binary phase diagram which explains mesophase formation in a pitch.

Figure 8.25 Pseudo-binary phase diagrams of the (a) Na2S04-CoS04,...

Figure 10 The Ni-Al pseudo-binary phase diagram illustrating the compositional range of the P-NiAl phase and the direction of the change in composition as the A1 the in bond coat is depleted by interdiffusion and selective oxidation [10],...

As mentioned above, the substitution phenomena affect Jc. properties as well as values in the R123 systems. It is sufficient to discuss the growth mechanism of Y123 crystals in the SRL-CP method on the basis of the pseudo-binary phase diagram (sect. 3.3.1). On the other hand, in the case of a solid solution such as Ndj Pri +j Ba2 jCu30 ,... 

Another useful pseudo-binary phase diagram is found upon fixing the surfactant concentration (y constant), and varying the ratio of oil to water (vary a) as a function of temperature. For surfactant concentrations greater than y, a one-phase channel is observed in the phase diagram, which spans all oil to water ratios (Figure 4.7). In the example shown in this figure, the... 

Figure 9.14. Pseudo-binary phase diagram of the water-oil-C/Ey system at equal water-to-oil volume ratios, representing the so-called fish-tail . This temperature-surfactant content T-y) representation is used to determine the temperature of the zero spontaneous curvature and the minimum amount of surfactant needed to include equal volumes of oil and water in a single-phase microemulsion...

Figure 9.15. Pseudo-binary phase diagram of the water-oil(cyclohexane - - lindane)-C6E5 system for different initial weight compositions of lindane in the oil , 0 x, 4 , 10 A, 15%. The arrow indicates the variation of the fish-tail with the increasing content of lindane in the oil, while the temperature T of the zero spontaneous curvature is given by the ordinate of the fish-tail...

Bearing in mind the Mo-Si system (Gokhale, 1991), the considerations drawn in paragraph 3.2.1 are valid. The eutectic temperature between MoSi and Mo Sij was achieved only in the HBM system sintered at 1900°C. Since the composite ZBM and TBM were densified at 1750 and 1680°C, lower eutectic temperatures have to be considered. Note that the C-MoSi pseudo binary phase diagram (Fan, 2000) indicates the formation of a eutectic at around 1630°C. 

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