Steady State Models for Isothermal Heterogeneous Lumped Systems

2 The Design Equations (Steady-State Models) for Isothermal Heterogeneous Lumped Systems 

Design equations are used in sizing the equipment, while mass-balance equations are components inventory equations. 

For simplicity and clarity, let us now consider a two-phase system where each phase has a single input and a single output with a single reaction taking place in each phase. 

In order to turn these mass-balance equations into design equations, we turn all the rate processes r, f, and RMi into rates per unit volume of the process for the specific phase, namely 

RMi = rate of mass transfer of component from phase I to phase II per unit volume of the process (mol/(min cm3), and V = volume of the process (cm3). 

---