Nano-sized ZnO particles were prepared by using zinc sulfate and sodium hydroxide as raw materials in the membrane dispersion micro-structured reactor by rapid mixing precipitation.The mixing scale model was used to simulate the precipitation process of nucleation

growth and agglomeration in the membrane reactor.Modeling results showed that particle nucleation dominated in the initial 0.6 ms

and after 1.6 ms

growth dominated.At the same time

due to a large number of particles

particles collision would cause aggregation

resulting in specific distribution of particle size.Mixing scale and reactant concentration had a great influence on particle diameter and distribution.Simulation results showed that when mixing scale reduced from 50 μm to 5 μm

average diameter of nano-ZnO particles decreased to 12 nm from 19 nm.Experimental results showed that with the decrease of membrane pore size

average diameter of nano-ZnO particles dropped down from 20 nm to 11 nm

and when initial reactant concentration increased from 0.05 mol·L-1 to 0.20 mol·L-1

average diameter of ZnO nanoparticles increased from 10 nm to 16 nm.Simulated average particle diameter and its distribution agreed well with the experimental values.