For many decades scale-up has been the most natural way of enhancing production capacity for any chemical.Scale-up needs special attention and a rigour to ensure that one retains consistent performance similar to the laboratory or pilot scale.With the advent of microreactors and other flow reactors,enhancement in the production rate is achieved by numbering-up using identical units.The concept is known for decades and examples like packed tubular reactors for production of ethylene oxide are widely practiced in the industry.