FLEXIFIBER® type BD (Brownian Diffusion) mist eliminator
High collection efficiency on submicron particles; low pressure drop

FLEXIFIBER™ type BD (Brownian Diffusion) mist eliminator


Benefits of FLEXIFIBER® type BD mist eliminators

  • Reduce or eliminate visible stack gas plumes
  • Provide unlimited turndown from design capacity
  • Achieve guaranteed pressure drop as low as 1.5 in [40 mm] W.G.
  • Interchangeable with existing fiberbed equipment
  • Capture submicron mist particles 0.1 microns or smaller



  • Sulfuric, nitric and thermal phosphoric acid plants
  • Chlorine and other chemical plants
  • Pulp mills
  • Textile mills
  • Asphalt saturators
  • Food processing operations
  • Chrome plating processes
  • Turbine lube oil tank vents
  • Plastic forming operations


The FLEXIFIBER type BD element uses the Brownian Diffusion mechanism to achieve collection efficiencies of up to 99.95% or higher on all submicron liquid particles down to 0.1 microns. Operating pressure drops are normally designed in the range of 50 to 500 mm (2-20 in) W.G.

An interesting feature of the FLEXIFIBER Type BD mist eliminator is that, with submicron particles, the collection efficiency actually increases as the gas flow rate decreases through the bed. Increasing residence time in the fiberbed optimizes Brownian movement.

Type BD elements are normally cylindrical in shape, and are available in a wide variety of materials. The Type BD element packed with carbon fibers is recommended if your application contains flourides, a high PH, or is subjected to steam. This will significantly increase the life expectancy of the element.

FLEXIFIBER type BD-LdP (low pressure drop) has increased submicron particle collection efficiency with reduced pressure drop when compared to conventional fiberbed technology. Because fiberbeds can consume large amounts of energy (such as in chlorine and sulfuric acid production trains), increased efficiency and reduced pressure drop provide significant reductions in operating costs. This technology brings benefits to any process in the forms of decreased investment, lower operating costs, and improved plant performance.

How it works
Brownian Diffusion occurs with extremely small droplets that randomly move from side to side not directly following the path of the gas stream. Typically, the smaller the particle, the greater the Brownian movement.

Materials of construction 

  • Wide variety of metal alloys
  • Thermal-set plastics
  • FRP
Packed fiberbeds
  • Special glass
  • Ceramic
  • Polypropylene
  • PTFE
  • Polyester fiber
  • Special carbon fiber media is available for applications that contain fluorides, high pH, or steam.


Additional information