Process

Fluid bed drying is a process by which particles, typically greater than 50 microns, are fluidized in a bed and dried. A fluidized bed is formed when a quantity of solid particulates are placed under conditions that cause a solid material to behave like a fluid. In a fluid bed drying system, air is passed through a perforated distributor plate which provides significant air flow to support the weight of the particles. This gentle drying technique is an ideal way to evenly dry particulates to a specific moisture content and can be used for fragile materials. The dried material can then be screened if necessary and packaged. The batch process allows time and temperature to be varied depending on the physical properties and constraints of the materials. The drying temperatures can range from ambient temperature up to 120 degrees Celsius.

Capabilities and Equipment Specs

Fluid Bed Equipment:

  • Vector FL-M system
    • Used for product development, clinical batches and small production
    • Fluid bed has the capacity to top spray and Wurster coating
    • Capacity ranges from 2 L to 3 L
    • Unit temperature can be set up to 100°C
    • Standard 0.3 micron filters
    • ~ 20µm particles can be processed
  • Lab-Scale fluid bed
    • Used for product development, clinical batches and small production
    • Capacity ranges from 3 L to 19 L
    • Unit temperature can be set up to 120°C
    • 200µm – 4.5mm particles can be processed
  • 7 Production scale units
    • Batch production
    • Capacity ranges from 90 kg to 320 kg in each bowl
    • Units can be run in parallel
    • Maximum temperature range up to 100°C
    • Maximum differential pressure 1045 kg/m3
    • Replaceable internal filter in the chamber to capture material
    • Maximum air volume 7500 m3/h
  • Witte fluid bed
    • Hot air drying BTU: 190,000
    • Product input & output temperatures: 20°C to 70°C
    • Feed rate: up to 160 kg/hr.
    • Product input moisture: up to 50%
    • Product output moisture: product dependent, but 4% or less is achievable

Pre- and Post-Processing Capabilities:

  • PLC interface to regulate temperature and other settings critical to your product
  • Data trending
  • Product screening
  • Multiple packaging options
Factors to Consider
  • What is the incoming particle size?
  • What is the allowable processing temperature range?
  • What is the incoming moisture content?
  • What is the final moisture requirement?