Decomposition of a fraction of hydrogen peroxide to oxygen during epoxidation of 3-chloropropene to epichlorohydrin results in explosion hazards in the gas phase of the reactor.Explosion datus of 3-chloropropene/oxygen/nitrogen mixtures was measured

and the limiting oxygen concentration (LOC) of the mixture was determined as 10.9%.Furthermore

the effect of the reaction conditions on oxygen concentration in the gas phase was investigated.The results showed that in order to reduce oxygen concentration in the gas phase

catalyst quantity should be reduced as low as possible

and stirring velocity should be increased properly

and H2O2 quantity should be controlled strictly.Moreover

H2O2 should be fed in batches after the liquid phase boils

and the feeding quantity of H2O2 in the initial stage of the reaction should be kept at a low level

which would avoid feeding H2O2 instantaneously or suddenly.