Category: Advanced Phase Diagrams

Phase Behavior 16.1. A binary mixture obeys a simple one-term equation for excess Gibbs energy, GE = Ax1x2, where A is a function of temperature: A = 2930 + 5.02E5/T(K) J/mol. a. Does this system exhibit partial immiscibility? If so, over what temperature range? b. Suppose component 1 has a normal boiling temperature of 310 K, and component 2 has a normal boiling temperature of…

P16.1. Consider the methanol(1) + water(2) + acetone(3) system with a feed shown in Figure 16.10(a). Rate each of the following products as impossible or possible, and explain. (ANS. impossible; impossible; possible; impossible.)

Since 1970 there have been several reviews and classifications of phase behavior2,3,4,5,6,7,8,9,10,11. The types are usually summarized by the projection of their phase boundaries onto two-dimensional pressure-temperature diagrams. Type I and II phase behavior have already been discussed, and they are shown by the upper two plots in Fig. 16.3. Note that azeotropic behavior is a…

Several types of phase behavior may occur in binary systems.1 In earlier chapters, we explored phase behavior by examining P-x-y or T-x-y diagrams. In this section we demonstrate how these phase diagrams are related to the three-dimensional P-T-x-y diagrams. The P-x-y and T-x-y diagrams are two-dimensional cross sections of the three-dimensional phase envelope, and by studying the phase envelope, the progressions of changing shapes of the two-dimensional…