Filtration Without Air Contact

Is air contact a tricky issue for you?

Regarding filtration, there are several products which are damaged or contaminated if they have air contact while others should not have air contact because of their own nature, for example carcinogenic products.

Regardless of the question whether the first or the second applies to your process, with a BOKELA BoCross filter, you can guarantee a hermetic, emission-free, and secure filtration. Due to a closed filter system, contamination can be eliminated, and your employees are able to work in accordance with the most modern health and safety requirements.

Furthermore, BoCross filters are also able to thicken even difficult suspensions without air inclusions in order to reach creamy consistencies in a following process step, for example, or to omit frothing, product contamination, or undesired oxidation. Our filter technology allows a completely closed, gas-tight process management and excels in complicated challenges while at the same time being a separation method that is particularly gentle on the product. BOKELA supports you as a reliable partner with expertise, experience, and a truly unique filter technology.

Filtration Without Air Contact

Reference Application

BOKELA Filter Plastic Precursors Pigments, Fillers, and Dyes Pharmaceutical Precursors Catalyst Recovery
BoCross Dynamic
  • Acrylonitrile
  • Biopolymers
  • Resins:
  • Polyolefin Resin
  • Melamine Resin
  • Latex
  • Aluminum flakes (effect pigments)
  • Aluminum oxide
  • Barium Sulfate
  • Barytes
  • Bismuth Vanadate
  • Blue Pigments
  • Calcium Carbonate
  • Ceramic Slurry
  • Kaolin
  • Nano Apatite
  • Nano Ferrite
  • Organic Pigment
  • Pearlescent Pigment
  • Red Pigment
  • Silicate Minerals
  • Silicia
  • Titanium Dioxide
  • White Glazing
  • Zinc
  • Zinc Oxide
  • Aluminum Fumarate
  • Biomass
  • Grain Fermentation Serum
  • Iron Hydroxide Complex
  • Nano Cellulose
  • Zirconium Oxide
BoCross MicroScreen
  • Polymeric Polyol
  • Aluminum Hydroxide
  • Aluminum Oxide
  • Boehmite
  • Biozide
  • Kaolin
  • Polymeric Gel Balls
  • Polymeric Particles
  • Aniline Process
  • Butynediol/ Butanediol Process


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.

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.

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.

Concentrating and Washing of Calcium Carbonate

Special PCC Product

For concentrating a fine-particulate special PCC product a BoCross Dynamic filter with 6 m² filtration area is operated.

Concentrating and Washing of a Pharmaceutical Iron Hydroxide

A pharmaceutical suspension is synthesized so that a considerable amount of salt is formed during neutralization. This microfine suspension must be cleansed (washed out) of salt and further concentrated.

Concentrating and Washing of Titanium

The BoCross Dynamic filter is used for concentrating and washing of a modified and very fine titanium dioxide which has to be further processed.

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.

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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