Why Select a Spray Dryer ?

Because of ....THE SURFACE AREA PRODUCED

The  unique feature of  a  spray dryer is  the surface area per unit weight 
generated  by  atomization  of the liquid feed.  It is this fact that enables a 
spray dryer to work.  

The dry  particle  size can be easily controlled by atomization of the liquid & 
the design of the hot gas inlet. "Non-dusting" powders can be made which is 
beneficial   for   hazardous   products, animal   feeds, dyes,  and  other 
products.


Because of ....THE EVAPORATIVE COOLING OF THE PRODUCT

The heat and  mass  transfer during  drying occurs in the air and vapor films 
surrounding    the  droplet.  This  protective envelope of vapor keeps the
particle  at  the  saturation  temperature.  As  long as the particle does not 
become "bone-dry", evaporation is  still taking place and the temperature of
the  solids will  not  approach  the  dryer  outlet  temperature.  This is why 
many  heat sensitive  products  can be spray dried easily at relatively 
high inlet temperatures.

Because of ....THE SHORT RESIDENCE TIME REQUIRED

The  surface  area  produced by atomization of the liquid feed enables a 
short gas  residence time which permits drying without thermal degradation. 


Because of ....THE REDUCTION IN CORROSION

Because  a  spray  dryer  is a  gas suspended process, the dryer chamber 
remains  dry  by  design.  Therefore, many  corrosive materials can be 
processed.

Because of ....THE FLOW PROPERTIES OF DRY SOLIDS

The  shape  of  most spray dried particles is spherical, which provides for 
fluid-like flow properties.  


Because of ....THE HOMOGENEOUS SOLIDS MIXTURE PRODUCED

Spray   drying   produces   the  most  homogeneous  product  for  multi-
component solution/slurries.  Each  particle  will be of the same chemical
composition as the mixed feed.