Composition and Function of Vacuum Filtrations

The vacuum filtration device is a kind of instrument for laboratory decompression filtration. Generally speaking, filtration can intercept particles, clarify filtrate, eliminate bacteria, separate solid and liquid, Degas, and defoamer. Vacuum filtration uses a filter membrane in the middle of the suction filtration bottle. The filter membrane divides the suction filtration bottle into two parts: the upper part contains the liquid to be filtered and the lower part contains the filtrate after filtration.

Because the filter membrane will produce great resistance to the passage of the liquid, resulting in slow filtration speed or ineffective passage of the liquid, the so-called vacuum filtration is to connect the suction filtration bottle with a vacuum pump to reduce the lower part of the filter membrane The vacuum degree of the bottle body enables the outside air to push the sample in the filter cup through the filter membrane. Therefore, vacuum filtration is a relatively complete system, which is composed of multiple parts. The lack of any part will affect the normal use of the instrument.

1. Vacuum filtrations and filtration pump: equipped with an oil-free vacuum filtrations and filtration pump, which is a dry vacuum pump that can be directly used after connecting the power supply. The suction end of the filter pump is equipped with a vacuum regulating valve, which is equipped with a vacuum gauge to facilitate the observation of the working state of the instrument and adjust the pressure and pumping speed as required. Many customers will consult when purchasing the suction filtration device that they must purchase the suction filtration pump.

Because the pore diameter of the filter membrane, filter paper, filter cloth, or filter screen is small, it will cause great resistance to the liquid passing through the filter membrane, which will cause the liquid not to pass through the filter membrane effectively. The suction filtration pump can form a pressure difference between the internal and external boundaries of the suction filtration bottle so that the external air can quickly push the filtrate through the filter membrane without using the suction filtration pump liquid The body can only naturally permeate the filter membrane and drop into the collecting bottle. Therefore, the suction filter pump is a necessary part.

Stainless Steel Three-Branches Vacuum Filtrations
SLVPGM050B-Standard-Diaphragm-Vaccum-Pumps

2. Filter cup: it is more convenient to use a cup with a scale line as far as possible to contain the liquid with a filter.

3. Automatic suction cup cover: the user only needs to use a hose to connect one end to the automatic liquid inlet interface, and put the other end into the filtrate to be filtered. After the switch is turned on, the filtrate will be automatically sucked into the filter cup to start filtering, and no need to manually pour the sample again, so the operation is convenient.

4. Filter membrane placement base: it is used to prevent the filter membrane. Generally, the surface is required to be flat without scratching the filter membrane. The connection with the filter cup is as simple as possible, and no clamps or clamps are needed.

5. Suction bottle: used to hold the filtrate or waste liquid after filtration. The bottom of the suction bottle of the vacuum filtration device is designed with a fast drain port. After filtration, it is not necessary to remove the suction bottle and then pour out the filtrate. It is only necessary to loosen the clamp of the bottom liquid distribution port to quickly drain the liquid, or even change the suction filter edge to drain the liquid. Improve efficiency, easy to operate.
Fixed seat: stabilize the suction filter bottle to avoid the accidental operation or shaking that may cause the suction filter bottle to fall.

6. Filter membrane: the vacuum filtration device is equipped with a filter membrane with a pore diameter of 0.45 μm and a diameter of 47mm. However, users can also choose a filter membrane with a suitable pore diameter and material according to their own needs. The pore diameter and material are not affected by the filter device and are selected according to the experimental needs of customers.

7. Water blocking Protector: built-in polytetrafluoroethylene hydrophobic membrane, which can block the inverted liquid 100%.

The primary function of vacuum filtration is to separate solid particles from a liquid by using a vacuum to draw the liquid through a filter medium while leaving the solid particles behind. This technique is widely used in laboratories and industrial settings for various purposes. Here are some key functions of vacuum filtrations:

  1. Separation of Solids and Liquids:
    • The main purpose of vacuum filtration is to separate a solid-liquid mixture. The solid particles are retained on the filter medium (usually filter paper), while the liquid passes through under the influence of a vacuum.
  2. Isolation of Precipitates:
    • In chemical reactions, especially those involving the formation of precipitates, vacuum filtration is used to isolate the solid precipitate from the reaction mixture. This allows for further analysis or processing of the isolated solid.
  3. Sample Preparation:
    • Vacuum filtration is commonly used in sample preparation for various analytical techniques. It enables the separation of impurities or unwanted components from a sample, providing a purified liquid or solid for further analysis.
  4. Concentration of Solids:
    • By collecting solid particles on the filter medium, vacuum filtration can be used to concentrate the solids in a given solution. This is particularly useful when dealing with dilute suspensions or solutions containing a small amount of solid material.
  5. Purification of Liquids:
    • Vacuum filtration is employed to remove solid impurities, particulate matter, or precipitates from liquids, resulting in a purified liquid product.
  6. Collection of Biomolecules:
    • In biological and biochemical laboratories, vacuum filtration is utilized to collect cells, proteins, DNA, or other biomolecules. This is crucial in processes such as cell harvesting and protein purification.
  7. Desalting and Buffer Exchange:
    • Vacuum filtration is often part of desalting procedures and buffer exchange processes in biochemistry. It helps remove salts or exchange buffer solutions by separating the desired biomolecules from smaller molecules like salts.
  8. Dewatering:
    • Vacuum filtration is used for dewatering processes, where it helps separate water from solid materials. This is common in industries such as mining and wastewater treatment.
  9. Air and Gas Analysis:
    • In air and gas analysis, vacuum filtration can be used to collect particulate matter from the sampled air or gas, facilitating subsequent analysis.
  10. Quality Control:
    • Vacuum filtration plays a role in quality control processes, where it helps ensure the purity and cleanliness of liquids or solid samples.

Overall, vacuum filtration is a versatile and widely applicable technique that provides a simple and effective means of separating solids from liquids in various scientific and industrial applications.

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