Catalysis plays a key role in almost all manufacturing processes in the chemical industry. Almost 90% of all chemical products undergo a catalytic process step during the production process.

Particularly heterogeneous catalysts such as solid materials, are of great importance. They are used in about 80% of all catalytic processes. The catalyst is in the liquid phase or gas phase together with the end products and must be separated from the mixture and recycled after the reaction. Usually, Raney nickel catalysts are used for this purpose.

The separation and recycling of solid catalysts from liquid phases often places high demands on both the separation apparatus and the filter medium. The requirements for such a task are the following:

  • separation of finest particles
  • compliance with given temperature and pressure values
  • aggressive media
  • short residence times of the catalyst outside the reactor
  • no air / gas contact of the catalyst during the separation and recycling

Our BoCross MicroScreen Filter offers unique solutions for such challenging filtration tasks.


  • butynediol/butanediol process
  • aniline process

Main benefits:

  • complete catalyst recovery
  • particle-free filtrate
  • no dilution of the suspension
  • very fast recycling of the catalyst in the process
  • no air/gas contact of the catalyst during separation and recycling
  • catalyst remains permanently suspended

BoCross MicroScreen filter

Classification Under Difficult Process Conditions.

Dynamic sieve filtration allows the separation of coarse or fine grain fractions. Highly viscous and concentrated suspensions can be filtered in a closed apparatus with high throughput and sharp separation cut.

Crossflow Filtration. For Difficult Suspensions

Macro, micro, or nano.

BoCross Dynamic and BoCross MicroScreen are dynamic crossflow filters for micro, ultra, dia or sieve filtration. With the BoCross filter series, suspensions with high concentrations or viscosities can be thickened, washed, cleared or classified.

Recovery of Catalysts by Dynamic Precoat Filtration

In a BDO production plant (butanediol process) 24 BoCross MicroScreen filter units of 10 m² each are applied for recovery of catalyst by dynamic precoat filtration.

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