Abstract: A model for the propylene chlorohydrin action process in propylene oxide plant is developed.The reactor featuring natural liquid circulating and forced gas recycling is considered as two bubble reactors connected in series,the first one being the chlorine absorber and the second one the chlorohydrination reactor.The reaction is of Fyvie mechanism and the mass transfer is characterized by simultaneous adsorption of two gases with the reactions carried out in the liquid phase.Side reaction occuring in the gas phase is also considered.The gas is assumed to be plug flow and the liquid complete mixing flow in both of the two reactors.The influence of the operating variables on conversion and yield is investigated by process simulation.The model presented is found to be successful in describing the static behavior of the reactor.It is demonstrated that low temperature,low feed gas ratio,low propylene chlorohydrin concentration and high recycle gas velocity are all favorable to improving the yield.