The modeling and simulation of semi-batch external loop spray ethoxylation reactor was studied.By analyzing the characteristics of the reactor

a mathematical model and numerical algorithm were developed to describe the behavior of the reactor.The model took the vapor-liquid transfer

kinetics

vapor-liquid equilibrium

variation of reactive volume

as well as the effect of inert gas nitrogen on the reactor into account.Based on the developed model

simulations were performed by taking the production of polyethylene glycol as an example.The simulation results provided the typical dynamic profiles of the reactor temperature

pressure

ethylene oxide concentration

as well as the ethoxylated oligomer distributions.Simulation results were compared with the full-scale plant data

which showed the reliability of the developed mathematical model.