Reactive distillation (RD),a combination of reaction and distillation in a single vessel,is receiving increasing attention because of its high potential for process intensification [1].RD can be effectively controlled to improve selectivity by manipulating position of the composition profiles or temperature profiles inside the RD column [2].The purpose of this study is to explore the dynamic behavior of the reactive distillation processes using a nonlinear wave theory and to control reactive distillation columns based on the wave theory.The wave theory analyzes steady-state and dynamic composition variations in a distillation column in terms of"constant-pattem waves".Viewing the movement of the sharp composition and temperature profiles as the propagation of such nonlinear waves can provide a valuable insight into the design and control of the RD column [3].In this study,we considered environmentally friendly processes for DPC production without using phosgene.Steady state design and dynamic behavior of the reactive distillation process are analyzed based on nonlinear wave propagation theory.We found that the high DPC yield is maintained by keeping the position of column composition profile at proper location.