This Demonstration simulates the startup of a propylene glycol reactor. The feed is composed of propylene oxide in an excess of water. You can change the values of the reactor's initial temperature and initial propylene oxide concentration. The Demonstration plots the concentration-temperature phase plane for various initial conditions. The practical stability limit (for this problem ) can be exceeded for certain values of the initial conditions (see Snapshot 3). Finally, the steady state is indicated by the red dot.