Narrow particle size distributions and particles in the range of 20-50 nm were obtained in microreactors in two studies. Thus, plate-like particles with the mean size of 50 nm were obtained following different durations of hydrothermal aging of the materials precipitated in the microreactor at Reynolds numbers of approximately 6,200 . These are much higher Re numbers than those used in the present study, whereas the size of the obtained particles is twice larger, possibly due to the overall residence time or the impact of high sheer in the microreactor. Plate-like particles of a similar size to those obtained in this work, approx. 20-30 nm, where obtained in another microreactor synthesis of hydrotalcites . Microreactors do allow to obtain small particles with a narrow distribution of particle sizes. However, the product yield of microreactors (space-time-yeild) is rather small for industrial production.