The activated carbon of the Activated Carbon filter sheet is a micro-porous inert material, which is acid-washed and steam-activated. When products are cleaned or decolorized, a physical bond is created between the interior surfaces of the activated carbon and the unclean or colored substances. Since this bond is largely non-polar, there is a great affinity to organic molecules.
The following factors affect the Adsorption Capacity of the Activated Carbon Filters:
The quantity of adsorbed substances increases at lower temperatures and the thus decreasing diffusion rate because the adsorption balance ensues more slowly. The adsorption capacity can likewise be increased if the properties and structure of the substances to be filtered are changed by rising temperatures.
Adsorption processes are decisively affected by the contact time between the product and the adsorbing substance. The adsorption performance can thus be controlled by the speed of filtration. Slow filtration speeds and extended periods of contact result in optimum utilization of the adsorption capacity.
Throughput of water through these filters is 600lt per square meter per minute. measured at 1 Bar pressure, at 20 degree Celsius.
Instructions for Correct Use
Activated Carbon filter sheets require careful handling when inserting them into the plate and frame filter. Avoid banging, bending, and rubbing the sheets. Do not use damaged depth filter sheets.
Each BECO depth filter sheet has a rough side and a smooth side. The rough side is the unfiltrate side; the smooth side is the filtrate side. Always ensure that the filtrate side is in contact with the clear filtrate plate when inserting the sheets.
Unless already completed after sterilization, Eaton recommends pre-rinsing the closed filter with 1.23 gal/ft² (50 l/m²) of water at 1.25 times the flow rate prior to the first filtration.
Depending on the application, this usually equals a rinsing time of 10 – 20 minutes.
Test the entire filter for leakage at maximum operating pressure.
High-proof alcohol solutions and chemical products that do not allow pre-rinsing with water should be circulated for 10 to 20 minutes. Dispose of the rinsing solution after rinsing.
Terminate the filtration process when a differential pressure of 43.5 psi (300 kPa, 3 bar) is reached.
The wetted Activated Carbon filter sheets may be sterilized with hot water or saturated steam up to a maximum temperature of 121 °C. The pressed filter package should be loosened slightly prior to sterilization. Make sure to sterilize the entire filter system thoroughly. Do not use until after the filter package has cooled down.
Sterilizing with Hot Water
The flow velocity should at least equal the filtration capacity. The water should be softened and free of impurities.
Temperature: 85 °C minimum
Duration: Run water through for 30 minutes after the temperature has reached 85 °C
Pressure: At least 0.5 bar at the filter outlet.
Sterilizing with Steam
Steam quality: The steam must free of foreign particles and impurities.
Temperature: Max. 121 °C (saturated steam)
Duration: Approx. 20 minutes after steam escapes from all filter valves.
After sterilizing with 50 l/m² at 1.25 times the flow rate.