A fluidized bed reactor uses gases as a fluidizing media to fluidize a solid catalyst bed for solid gas reactions. Finely divided catalyst particles are contained in a cylindrical vessel with a grid at the bottom to support the bed. Fluidizing gases enter through the grid to fluidize the bed and ensure sufficient pressure drop across the grid to avoid catalyst seepage below the support.

1. Fluidized Bed Reactor
 In chemical industries, fluidized bed
reactors are used for solid gas
reaction.
 Gases are used as a fluidizing media
to fluidize the solid catalyst, which
is a bed of finely divided solid
particles. This fine powder is
contained in a cylindrical vertical
shell, having a grid at the bottom to
support the catalyst bed.
 Fluidizing gases enter from the bottom
vessel through this catalyst support
grid.
 The flow of fluidizing gases or
reactant gases is maintained to ensure
sufficient pressure drop across the

2.  This pressure drop is important to avoid catalyst seepage below
the support grid.
 Minimum recommended pressure drop across grid is around 30% of the
total catalyst bed weight.
 Particle size distribution of the powder solid catalyst can be in
the range from 20μ to 250μ.