Precautions for Vacuum Filtration

Under the effect of the pressure difference, when the suspension passes through the filter medium, the particles are trapped on the surface of the medium to form a filter cake, and the liquid flows out through the filter medium, achieving the purpose of solid-liquid separation.

The difference is that the filter plate of the filter medium has micropores that produce the capillary effect. The capillary force in the micropores is greater than the force exerted by the vacuum so that the micropores are always filled with liquid. No matter what the situation, the filter plate air is not allowed to pass through. Because there is no air to pass through, the energy consumption is low and the vacuum degree is high during solid-liquid separation.

Vacuum filtration
The vacuum filter creates a negative pressure at the filtrate outlet as the driving force for filtration. It has the advantages of light weight, convenient installation and maintenance, and simple operation.

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One uses porous glass as the filter membrane support pad, which can ensure that the trapped particles are evenly distributed on the surface of the filter membrane, so it is particularly suitable for the collection of particulate matter. The other uses a PTFE-coated stainless steel screen as a filter membrane support pad, which is suitable for collecting filtrates, such as sample removal and other applications. When filtering viscous liquids (such as collecting particles from oil samples), this type of filter is also recommended for easier cleaning.

Vacuum filtration-the principle of the filtration cycle

First, we need to divide the filter medium into the upper and lower chambers, which is a simple filter. The suspension is added to the upper chamber, and then under the action of this pressure, the filter medium enters the lower chamber and becomes the filtrate, and the solid particles are left in the filter. The phenomenon of the formation of filter residue on the surface of the medium.

Of course, during this filtering process, the filter residue layer on the surface of the filter medium gradually thickens, and some resistance for the liquid to pass through the filter layer slowly increases, and the filtering speed is correspondingly reduced.

When the filter chamber is full of filter residue or the filtering speed is very low, the filter will be stopped, and then the filter residue will be removed and the filter medium will be regenerated. In this way, the one-time filtration cycle is successfully completed.

Vacuum filtration matters need attention in the daily operation

Before using the vacuum filter, we must first check whether the inlet and outlet piping has been installed properly, and then fix the inlet and outlet pipes in this tank, so that the inlet and outlet can not easily swing. Then open the exhaust valve and then open the medicine valve, pass the water from the dosing valve through the dosing tank and then into the vacuum pump and the mouth tube, so that the inlet tube is completely filled with liquid, or open the upper cover of the filter.

Remove the upper cover and pour water into the filter cartridge so that the inlet pipe is completely filled with liquid. Before starting the motor, check whether the motor wiring voltage is correct, to prevent errors. Before starting the motor, lock the dosing valve first and then open the exhaust valve to allow the gas to be discharged into the dosing tank through this conduit.

Equipment Precautions

Check Equipment Integrity: Before starting, inspect the vacuum filtration apparatus for any signs of damage, leaks, or wear. Ensure that all components are in good condition.

Use Appropriate Glassware: Choose glassware that is compatible with the chemicals and solvents being used. Some chemicals may react with certain types of glass, leading to breakage or contamination.

Secure Connections: Ensure that all connections between the flask, funnel, tubing, and vacuum source are secure and airtight. Loose connections can lead to loss of vacuum pressure.

Buchner Funnel Placement: Place the Buchner funnel securely on the filter flask to avoid any movement or tipping during filtration.

Proper Vacuum Source: Use a vacuum pump or aspirator that is appropriate for the required level of vacuum. Adjust the vacuum level based on the specific filtration needs.

Safety precautions for filtration

Use appropriate protective equipment: When working with chemicals and solvents, it is important to wear appropriate protective equipment such as gloves, safety goggles, and lab coats.

Use a proper filtration apparatus: Ensure that the filtration apparatus, including the vacuum pump and the filter flask, are in good working condition and properly assembled.

Choose the correct filter paper: Select the correct filter paper that is compatible with the solvent or liquid being filtered.

Avoid overfilling the filter flask: Overfilling the filter flask can cause the liquid to overflow and potentially damage the vacuum pump.

Release the vacuum slowly: When the filtration is complete, release the vacuum slowly to avoid sucking air through the filter and potentially losing some of the filtered material.

Proper storage of chemicals: Store chemicals in designated areas, away from the filtration setup, to prevent accidental spills or exposure.

Check for leaks: Inspect all connections for air leaks before starting the vacuum. This ensures a consistent vacuum pressure.

Select the right filter material: Choose filter paper or membrane that is compatible with the chemicals being used. Some chemicals can react with certain filter materials.

Avoid overloading the filter: Do not overload the filter paper or membrane with too much solid material. This can lead to slower filtration and potential clogging.

Handle chemicals safely: Follow proper safety procedures when handling chemicals. Be aware of the hazards associated with the substances being filtered.

Release vacuum slowly: When you’re finished with the filtration, turn off the vacuum pump and release the vacuum slowly to avoid sudden changes in pressure.

Disposal of waste: Dispose of the filter paper and the collected solids in the appropriate waste containers according to local regulations.

Clean up: Clean the filtration apparatus thoroughly after use to prevent contamination and maintain its performance.

Overall, it is important to handle the filtration apparatus and the filtered material with care to ensure safe and accurate results.