Spray Dryer

Spray drying can be used in a wide range of applications where the production of a free-flowing powder is required. Almost all other methods of drying, including use of ovens, freeze dryers or rotary evaporators, produce a mass of material requiring further processing (e.g. grinding and filtering) therefore, producing particles of irregular size and shape. Spray drying on the other hand, offers a very flexible control over powder particle properties such as density, size, flow characteristics and moisture content.

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Flow Diagram


Features :

  • Spray drying system is simpler than other drying methods since the powder is available directly from liquid material (solution or suspension).
  • By atomizing the liquid, surface area per unit weight increases, thus higher efficiency forcontacting to hot air is achieved and drying process can be carried in a shorter time.
  • Due to the latent heat of evaporation, surrounding fine powder during the process will not be at a high temperature.This system is therefore suitable for material that is vulnerable to heat.
  • As the atomized liquid becomes spherical due to surface tension, the dried powder also does.

Advantages :

  • The dry particle size can be easily controlled by atomization of the liquid feed and the design of the hot gas inlet.
  • The shape of most spray dried particles is spherical, which provides for fluid-like flow properties. 
  • Spray drying produces the most homogeneous product for multi-component solutions and slurries. 
  • The heat and mass transfer during drying occurs in the air and vapor films surrounding the droplet.
  • The surface area produced by atomization of the liquid feed enables a short gas residence time.
  • Because a spray dryer is a gas suspended process, the dryer chamber remains dry by design.

Applications :

  • Food: milk powder, coffee, tea, eggs, cereal, spices, flavorings, starch and starch derivatives, vitamins, enzymes, stevia, colourings, etc.
  • Pharmaceutical: antibiotics, medical ingredients, additives
  • Industrial: paint pigments, ceramic materials, catalyst supports, microalgae
  • Bone and tooth amalgams
  • Beverages
  • Flavours, colourings and plant extracts
  • Plastics, polymers and resins
  • Soaps and detergents
  • Textiles and many more