ABSTRACT

Thiele modulus, and Weisz modulus. • Dene, evaluate, and use the concepts of enhancement factor

and Hatta modulus.

Introduction When more than one phase is involved in a reaction, inevitably an interface formed, creating its own resistance to transport. This situation has to be understood clearly and discussed carefully when designing reactors involving more than one phase. The concept of resistance is mostly a disguise. However, when complex reaction schemes with selectivity issues are present, resistance to unwanted products or reaction pathways can offer very good solutions. To choose the best alternative, the design engineer should understand the chemical reactions from the perspective of resistances across the interfaces. Before we begin the detailed treatment of the mass and heat transfer effects in chemical reactors, we will dene the terminology.