This paper studies the mass transfer performance of the jet external loop reactor using the water-HAc-kerosene system and the effect of the section structure of the reactor and the material velocity on the mass transfer performance.The loop reactor is divided into five sections according to the hydrodynamic characteristics

which are bottom

premixing

mixing

looping and separation sections.There is almost water phase in the bottom section and its mass transfer could be neglected.An empirical expression between the equilibrium concentration of HAc in water phase and the initial concentration of HAc in oil phase was obtained by the regression of experimental data.And then the mass transfer performance of the other four sections was researched.The results show that the mass transfer performance of all sections increased as the superficial velocity of both oil and water phases went up.The mass transfer performance of all sections could be greatly increased by feeding in the distributing pipe.And the higher the velocity in the distributing pipe

the better the mass transfer performance.The mass transfer coefficient of four sections with a sequence from large to small under the same condition was as follows

premixing section

mixing section

looping section

and separation section.