In the synthesis of plastic intermediates, filtration is a crucial step in many processes and the filtration equipment has to meet the most varied and demanding requirements.

Typical challenges include:

  • separation of solids with very broad particle size distribution
  • washing out of residues or recovery of the liquid phase
  • high throughputs
  • consistently high and constant product quality
  • avoiding contact with air
  • emission-free operation
  • compliance with given temperature and / or pressure conditions
  • continuous operation

Our BoHiBar Drum and BoVac Drum series have proven their performance and cost-effectiveness worldwide in numerous applications for a wide variety of plastic intermediates. They are known for outstanding process results, high reliability, low maintenance costs and minimal energy consumption. BoHiBar Drum filters ensure reliable and continuous filtration even at high process pressures up to 7 bar (a) and temperatures up to 200 °C. Our BoCross MicroScreen series offers unique advantages in the filtration of suspensions with a very narrow particle size distribution.


  • acrylonitrile
  • biopolymers
  • HDPE
  • latex
  • polyol
  • PVC
  • resins
  • terephthalic acid (PTA, CTA)

Main benefits:

  • high throughput rates
  • highly efficient filter cake washing with minimal need for wash liquid
  • lowest residual moisture
  • saving on drying costs or even making thermal drying redundant
  • process pressures up to 7 bar (a) and
  • temperatures up to 200 °C
  • continuous, fully automatic operation

BoVac Drum filter

Excellent With Regard to Filtration, Washing and Dehumification.

Thanks to their innovative, distinctive profile, BoVac Drum filter are among the most modern and most efficient vacuum drum filters. They are used in various industries. The exchangeable filter cells allow changing the filter cloth during on-going operation.

BoHiBar Drum filter

For Filtration, Washing and Dehumidification of Fine-Grained Products.

If products or processes are challenging, the BoHiBar Drum filter can prove their strength: high specific throughputs, low residual moisture, clean filter cakes. High process pressure and high temperatures are not an obstacle. Contaminations can be easily omitted with the BoHiBar Drum filter.

BoCross Dynamic filter

High Final Concentration and Clear Filtrate.

The range of services of the BoCross Dynamic filter allows micro filtration and ultra filtration of even nanoscale suspensions. The shear gap principle ensures almost ideal physical conditions for the separation process and thus, for the high concentration of suspensions.

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.

Continuous Pressure Filtration

For particularly fine particles, high throughputs and very low residual moisture.

Continuous pressure filtration with a BoHiBar Disc filter is the right solution for products difficult to filter and high suspension amounts, as for example in ore, coal or mineral processing. The BoHiBar Drum filter provides excellent results with regard to filtering and washing fine-grained products and demanding process conditions.

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.

Steam Pressure Filtration of an Organic Acid (Naphthalene-Sulphonic Acid)

This BoHiBar drum filter is operated for steam pressure filtration of an organic acid. The suspension coming from the reactor consists of organic crystals suspended in water and is enriched with salts that are completely dissolved in the filtrate.

Vacuum Filtration. State-of-the-Art Design for High Performance.

BoVac Disc, BoVac Drum and BoVac Pan – those are continuously working disc, drum and pan filters for vacuum filtration. They are used especially with regard to continuous production processes with high throughputs.

Dynamic Sieve Filtration of a High Viscous Polymeric Suspension

From a high valuable polymer dispersion coarse particles (x > 20 µm) have to be separated completely. The difference in density of the particles compared to the fluid is negligible.

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