Microreactor is generally referred to a mini-reactor made by microfabrication and precision machining technology. It is one of the core components of microchemical technology. Compared with the traditional batch reactor

the microreactor has many advantages

which complies with the requirements of high technology content and sustainable development. In chemical engineering

materials

biology and many other fields of research and production process

the microreactor has a broad application. It involves the synthesis process of the dangerous or unstable chemical compounds and the high exothermic reaction process. In this paper

two parts are introduced respectively

involving the research progress of continuous diazotization and continuous diazotization/coupling reaction for synthesis of azo dyes and azo pigments. The microreactor technology makes the chemical reaction process become faster

safer and more environmentally friendly

so it has high industrial application value and is one of the future development directions of the chemical industry.