“…and P, Q, R, S,.. . are known (Konoki, 1956(Konoki, , 1960(Konoki, ,1961Levenspiel, 1972), and this design procedure has also been extended to moderate recycle, and to the injection of cold feed or cold inert between stages. However, one point has not been considered: whether the chosen design points are stable or not, whether they are liable to a temperature runaway or hot spot behavior.…”