Design and synthesis of heterogeneous azeotropic distillations—I. Heterogeneous phase diagrams

Flash-point prediction for binary partially miscible mixtures of flammable solvents

“…The measured values were almost constant in the region of two liquid phases, where the methanol composition ranged between 0.06 and 0.97 (Table 6 2) a pseudo-homogeneous liquid flash point curve is predicted and is substantially less than the experimental data. Besides, its smooth concave then convex shape is similar to the shape of pseudo-homogeneous boiling temperature-composition curve predicted in vapor-liquid equilibrium calculations when neglecting partial miscibility of partially miscible mixtures [25]. Table 7 also demonstrates that the model that considers partial-miscibility behavior is superior to the model that does not.…”

“…Since any liquid composition located on this tie-line, in particular the composition of both liquid phases in equilibrium, is in equilibrium with a single vapor composition located on the so-called vapor line [24,25], the flash point in this region should keep constant whatever the liquid composition on the liquid-liquid equilibrium tie line.…”

Conceptual Design of Azeotropic Distillation Processes

“…Reliable and sound techniques for assessing phase stability are required [64]. Global and local phase stability tests have been reviewed by Cairns et al [65] and Zhang et al [66].…”

Feasible separations and entrainer selection rules for heteroazeotropic batch distillation

“…However, we should note here that the reflux cannot always move freely along the binodal curve. The critical point of the binodal curve, that is the point where the distinction between coexisting liquid phases vanishes (Pham and Doherty, 1990b), limits the reflux on its movement. If the reflux "meets" the critical point before it reaches the intersection point of the binodal curve with the distillation boundary, then no liquid-liquid split is available anymore and thus the process is infeasible.…”