Roozeboom diagrams

Figure 2 compares the experimental data (8) with the provisional equilibrium compositions on a conventional Roozeboom diagram. It appears that equilibrium is most closely approached in the mid-range compositions, but compositions closer to the end-members KC1 and KBr deviate... 

Figure 2. Roozeboom diagram comparing experimental and provisional equilibrium compositions in the KCl-KBr-I O system at 25°C.

As already remarked in the introduction, the formulation of the laws governing heterogeneous equilibria by Bakhuis Roozeboom1 was partly based on his studies on gas hydrates. Although the general laws he derived are certainly correct, and have marked an important step in the development of physical chemistry, Roozeboom and his contempories were mistaken in the nature of the phase diagram of gas hydrates gas hydrates are not stoichiometric... 

Roozeboom, Bancroft and others have used triangular diagrams with lines ruled parallel to each other as shown in Fig. 38. Sup-... 

It should be noted that the axes of this diagram are quite different from those of a conventional Roozeboom triangular phase diagram. The lengths of the sides of the latter are usually scaled from 0-100% of a particular component. This is not practicable for dispersions because the volume... 

Figure 1. Bakhuis-Roozeboom (pTx) diagram for a binary system with two critical end-points, showing the temperature range within SFE preferably is carried out (see text).

Roozeboom referred to the preparation of chromium oxychloride, the liquid obtained containing a considerable proportion of free chlorine. The proportion of chlorine was stated to vary continuously with the temperature and pressure, the phenomenon being deemed to be one of solution. The solubility pattern may be approximately assessed by reference to Fig. 68 the R-line value for chlorine at 10°C is Nq2 about 0.20, xq2 about 0.25. 1 need only mention the paper on liquid-vapor equilibria of the hydrogen-carbon dioxide system by Spano, Heck, and Barrick (1968) as a different type of example for study against the background of the R-line diagram. 

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