1. Typically these types of reactors are called packed bed reactors or PBR's. 2. A chemical reactor, typically tubular reactor, could be a packed bed . 3. A moving bed reactor has a fluid phase that passes up through a packed bed . 4. He is known for the Ergun equation, which expresses the pressure drop across a packed bed . 5. The problem is not the packing itself but the mal-distribution of the fluids entering the packed bed . 6. He contributed greatly to the theory of formation and movement of creeping fronts through the packed bed . 7. The packed bed is then rinsed with the liquid extractant until inlet and outlet concentrations are the same. 8. Conventionally ion exchange has been used in a packed bed where a pre-clarified liquid passes downward through a column. 9. In expanded bed adsorption, a fluidized bed is used, rather than a solid phase made by a packed bed . 10. Hence EBA can be modelled as frontal adsorption in a packed bed , rather than as a well-mixed, continuous-flow adsorber.