The book "Chemical Reactor Development" is aimed at chemists and chemical engineers involved in the development of chemical syntheses, starting from the laboratory and culminating in the design of commercial reactors. It is also of interest to students of chemistry and chemical engineering. The work provides a comprehensive introduction to the fundamentals of chemical reaction engineering and addresses the physical phenomena that influence the outcomes of chemical reactions. This includes aspects such as micro and mesomixing, residence time distribution, and mass transfer between phases. Additionally, various applications, including organic syntheses and catalytic processes, are discussed. The book concludes with a discussion on the importance of selectivity for product quality and purity.