Recycle tubular reactor model with axial dispersion leads to a special boundary value problem, in which one boundary condition involves the values at two end points.

Based on the experimental results, the flow pattern in the settling section and the circulating section of reactor were analyzed by axial dispersion model and tank-in-series model, respectively.

The mixing process in the industrial acetic acid reactor is analyzed, the impeller selection and calculation of the gas-liquid dispersion mixing are described in this paper.