A Hierarchical Optimization Approach to Optimal Production Scheduling in an Industrial Continuous Olefin Polymerization Reactor Academic Article uri icon


  • The time-optimal grade-transition policies, as well as the selection of the optimal grade production sequence, are calculated for a gas-phase ethylene/but-1-ene copolymerization FBR. The tuning parameters (i.e., proportional gain and integral time) of the feedback PI process controllers, as well as the time-optimal trajectories of the feedforward controllers, are treated as decision variables. A two-level decomposition approach is applied for solving the optimal-grade transition-scheduling problem, taking into account the impact of both transient operation and the sequence of grade transitions on the overall amount of off-spec polymer and overall transition time. 2009 WILEY-VCH Verlag GmbH & Co. KGaA.

published proceedings


author list (cited authors)

  • Chatzidoukas, C., Pistikopoulos, S., & Kiparissides, C.

citation count

  • 25

complete list of authors

  • Chatzidoukas, Christos||Pistikopoulos, Stratos||Kiparissides, Costas

publication date

  • February 2009