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. The dispersion has a viscosity of 1000 mPas (1000 times higher than the viscosity of water) and the coarse particles have a concentration of only 20 ppm. Every sieving process tested for this demanding application failed due to poor results like:

  • no satisfying cut point
  • too high product loss
  • low throughput rates
  • interrupted production and high operating costs by permanently clogged filter


With the BoCross MicroScreen filter the dispersion can be sieved in an economical way with best results like

  • cut point at 20 µm
  • continuous operation with high throughput rate of 4000 l/h per filter
  • extremely low amount of retentate or product loss, resp., of only 0,1%
  • extremely long life time of the special designed sieves

BoCross MicroScreen Filter XL12

Units installed

[ - ]

1

Filter area per unit

[m²]

12

Material

[ - ]

1.4571

Filter drive power installed

[kW]

45

Footprint

[m²]

13

Year of commissioning

[ - ]

2003

 

Process and Operation Data

Feed flow

[kg/h]

4000

Amount of retentate

[kg/h]

0.4

Coarse particles in feed

[ppm]

20

Coarse particles in concentrate

[ppm]

5,000

Coarse particles in filtrate

[ppm]

< 5

Life time of sieves

[years]

> 10

Operation pressure

[bar]

< 2

 

Product Data

Product

 

Polyol

Sieve cut

[µm]

20

Viscosity

[mPas]

1,000

 

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