Qualitatively different bifurcation diagrams for a reactive flash

It is noted, additionally, that for vapor-only Oq 1) or liquid-only ( g 0) feeds the f — x bifurcation diagram exhibits at least one u-boundary and one /-boundary. Finally, for nominal feed conditions i.e. 0 Oq 1) at least one feasibility boundary exists, depending on the value of q. 

As a vapor product from a liquid feed Oq 0) is possible only if heat is supplied q 0), the feasible region in figure 7.7a is located at the upper plane. Similarly, as a liquid product from a vapor feed Oq 1) is attained exclusively by heat removal q 0), the feasible region in figure 7.76 occupies the lower plane. Thus, when the feed is sub-cooled liquid or over-heated vapor, the reactive flash model has feasible steady states only over a finite range of heat duty. 

Phase diagrams for these three 0g-regimes i.e. 0g 0 0 0g 1 and Oq 1) exhibit different qualitative topology (see figure 7 in Lakerveld et al. (2005)). That figure 

---

Figure 7.4. Qualitatively different bifurcation diagrams for a reactive flash undergoing an isomerization reaction. Symbols ( ) if v = 0 ...

---