leftBar
BHS Filtration
navigation:

Process & Filtration Testing

BHS Pocket Leaf Filter

Rental Filter for On-Site Testing

I. Description

The unit includes a vessel, an inlet cover with a pressure gage and a gas connection, and bottom outlet piece that holds the filter cloth. The vessel and bottom outlet piece of the Stainless Steel unit are jacketed and may be heated or cooled. The Polypropylene unit is not jacketed. The following are the basic specifications of the units:

Stainless Steel:

  • Filtration area = 20 cm2 (3.1 in2).
  • Maximum working pressure = 6 barg (87 psig).
  • Maximum working pressure of the jacket = 5 barg (72 psig).
  • Process Volume = 400 ml, 1000 ml, or 2000 ml.

Polypropylene Pocket Leaf Filter:

  • Filtration area = 12 cm2 (1.9 in2).
  • Maximum working pressure = 6 barg (87 psig).
  • Process Volume = 250 ml.

II. Required Accessories

  1. MSDS[base ']s for all materials.
  2. 2000 to 4000 ml (0.5 to 1.0 gallon) of good quality feed material for each material to be tested.
  3. 2000 ml (1.0 gallon) of wash material for each wash.
  4. A 1000 ml to 4000 ml (0.25 to 1.0 gallon) closed container to use to shake up the feed material before each run.
  5. Several 250 ml to 500 ml (32 oz. To 64 oz.) containers for the feed material, the filtrate, the fresh wash material, and the wash filtrates.
  6. Small containers for the filter cake.
  7. A gram scale.
  8. A vacuum oven or some other way to check the % solids in the filtrate and wash filtrates, and the % moisture in the filter cake.
  9. Gloves and breathing equipment (if required by the MSDS[base ']s).
  10. A regulated air or N2 supply that can be controlled at 3 barg (45 psig). The air or N2 inlet connection can be a 3/8" barbed hose connection or an 1/8" Female ISO fitting.
  11. A flow meter on the air or N2 supply is recommended. The flow meter allows the air or N2 flow rate to be measured during the drying step. The air or N2 flow is usually between 0 and 200 scfh.
  12. Stopwatch.
  13. Ring clamp and support stand.

III. Test Preparation

  1. Heat or cool the unit if required by the product.
  2. Connect the inlet cover to the high-pressure gas.
  3. Select the filter cloth. (See section with the filter cloth specifications).
  4. Place the filter cloth on top of the cloth support in the bottom outlet piece.
  5. Connect the bottom outlet piece to the unit.

IV. Operation

A. Filtration

  1. Remove the inlet cover from the unit.
  2. Place a receiver under the unit for collecting the filtrate.
  3. Measure out enough feed material to make the desired cake thickness.
  4. Slowly pour the measured feed material into the unit.
  5. Connect the inlet cover to the unit.
  6. Apply the desired pressure to the unit.
  7. Start the stop watch and measure the amount of time it takes for the first bubble of gas to come out of the bottom outlet piece.
  8. Release the pressure from the unit.

B. Washing (This step may be repeated as needed)

  1. Remove the inlet cover from the unit.
  2. Place a receiver under the unit for collecting the wash filtrate.
  3. Measure out the wash liquid.
  4. Slowly pour the measured wash liquid down the inner wall of the unit. Try not to disturb the cake when pouring the wash liquid into the unit
  5. Connect the inlet cover to the unit.
  6. Apply the desired pressure to the unit.
  7. Start the stop watch and measure the amount of time it takes for the first bubble of gas to come out of the bottom outlet piece.
  8. Release the pressure from the unit.

C. Drying

  1. Apply the desired pressure to the unit.
  2. Start the stopwatch and measure the drying time. Measure the flow rate of the gas, if possible.
  3. Release the pressure from the unit.

D. Cake Discharge

  1. Remove the inlet cover from the unit.
  2. Remove the bottom outlet piece.
  3. Measure the cake thickness.
  4. Remove cake.
  5. Weigh the cake and carry out any desired lab tests (% moisture, etc.).
  6. Inspect the cake for cracking.