A STAGEWISE ALGORITHM FOR MULTICOMPONENT MULTISTAGE BATCH DISTILLATION CALCULATION

A stagewise algorithm is proposed for the solution of multicomponent m ultistage batch distillation problems. In order to make the algorithm more precise and flexible, a generalized implicit Euler equation is im plemented for numerical integration of the process variables on each s tage at succeeding time steps. An overall normalized theta method is a lso employed to accelerate convergence for each time step. The relativ e performance of the proposed method compared with the Runge-Kutta met hod is shown using a numerical example; the CPU time can be decreased by up to 1/300. Comparison of the simulation results with the experime nt suggests the adequacy of the proposed method.