Structural analysis of high-index DAE for process simulation
  This paper deals with the structural analysis problem of dynamic lumped process high-index DAE models. We consider two methods for index reduction of such models by differentiation: Pryce's method and the symbolic differential elimination algorithm rifsimp. Discussion and comparison of these methods are given via a class of fundamental process simulation examples. In particular, the efficiency of the Pryce method is illustrated as a function of the number of tanks in process design. 
Xiaolin Qin, Wenyuan Wu, Yong Feng and Greg Reid
cs.SY