Applied Chemical Technology, Inc.

- Model 300XP - Multifunction Filter/Fluid Bed Dryer System



The 300XP model fluid bed is more than just a conventional fluid bed dryer. As an added feature, the 300XP model uses a filtration step to recover a solvent from a slurry. In the filtration step, a pressure difference is set up. It is the difference in pressure that forces the liquid solvent through a screen or cloth. The large solid particles are trapped by the screen or cloth and build up as a cake. Once the solvent is physically removed from the slurry, the wet cake in the product bowl is transferred to the fluid bed dryer.

The fluid bed dryer is designed to fit the product bowl where the remaining solvent is evaporated using a warm gas stream. In the fluid bed, the particles become suspended in the gas stream, and the bed of powder behaves as a boiling liquid. Depending on the gas velocity, the bed of powder behaves differently.

The type of fluidized bed is dependent on the gas velocity and the physical properties of the powder. Since the gas stream mixes and suspends the bed of material, fluid beds provide gentle and rapid drying applications.

  • Fluidization velocity: 45 to 500 ft/min
  • Inlet gas temperature: Ambient to 250º F (120ºC)
  • Condenser temperature: 32ºF (0ºC) to Ambient
  • Fluid bed area: 1.35 ft3 (0.125 m2)
  • Product bowl volume: 50L
  • Material of construction: 316 SS

  • Dimensions: 9’ 6” H x 18’ L x 12’ W
  • Overall weight: 4,000 lbs.
  • Electrical: 240 V, 3 phase, 60 Hz, 30 amp
  • Compressed air: 3 cfm @ 90 psi
  • Inert gas (Nitrogen)*: 7.5 lbs.
  • Heat transfer fluid*: 4 gpm @ 90ºF
  • Chiller*: 4 gmp @ -15ºF


The purpose of the solvent recovery system is to remove the solvent in the inert gas stream supplied to the fluid bed dryer.

In the dryer, the solvent of the material evaporates into the gas stream. An internal fluid bed filter (1) and a pre-filter (2) remove particulates in the gas stream. A condenser coil (3) lowers the temperature of the gas stream, which condenses some of the solvent onto the coils. The condensed solvent is collected in a solvent recovery tank (6). A pressure relief valve (4) downstream from the condenser coil protects the ductwork from overpressure scenario.

The blower (5) recirculates the gas stream to the fluid bed. Prior to the fluid bed, the temperature of the gas stream is increased by the heating coil (7). A HEPA filter (8) cleans the gas stream upstream from the fluid bed. The oxygen concentration of the system is monitored and controlled by the control system using a dilution purge.

  • Allen-Bradley PLC and touch screen panel
  • Temperature controller for heat exchanger, and condenser
  • Blower controller for adjusting gas flow
  • Product bowl position controller
  • Product temperature display
  • Exiting air temperature display
  • Backpulse filter timer
  • Pressure drop indicators
  • Gas flow indicators
  • Isolation valves
  • Inerting system with oxygen concentration controller and alarm

  • Batch report system
    • Inlet gas temperature
    • Product temperature
    • Gas flow rate
    • Spray rate
    • Batch time
  • Humidity indicators
  • Total remote operation
  • Vacuum purge system

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