Working Principle of Vacuum Filtration

The vacuum filter working principle is to form negative pressure at the outlet of the filtrate and use it as the driving force of filtration. The vacuum filtration equipment with intermittent operation is mainly introduced below. This equipment can filter suspensions of various concentrations. Hawach provides Stainless Steel Triple-Branches Vacuum Filtration Units, Stainless Steel Single-Branch Vacuum Filtration Manifold, Glass Single Vacuum Filtration Apparatus, 300ml Glass Solvent Filters, and 500ml Glass Solvent Filters for your choice.

Vacuum filter working principle

The intermittent operation of vacuum filtration equipment has been developed because of its ability to achieve automated operation, and the filter area is getting larger and larger. To obtain the filter residue with low moisture content from the vacuum belt filter, the mechanical press filter was developed. The vacuum filter working principle is as follows:

The containers are separated into upper and lower chambers by filter media, which constitutes a simple suction and filtration equipment. The suspension is added to the upper chamber. Under the action of pressure, the filter medium enters the lower chamber and becomes the filtered liquid. The solid particles are intercepted on the surface of the filter medium to form the filter residue (or filter cake).

During the filtration process, the vacuum filtration residue layer accumulated on the surface of the filter medium gradually thickens, the resistance of liquid passing through the filter residue layer increases, and the filtration speed decreases. When the filter chamber is full of filter residue or the filtering speed is too small, stop filtering, remove the filter residue, and regenerate the filter medium to complete a filtering cycle.
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Be aware of the moisture and impurities in the compressed air. The air entering the filter is twisted to make the moisture and impurities settle under the filter. When the highest water level is reached, the drain plug of the drain must be opened to allow the water to drain. The compressed air from the air source contains excessive moisture and oil droplets, as well as solid impurities such as rust and sand, which can damage the piston seal ring, block the small exhaust holes of the components, and shorten the use of the component’s life or make it invalid.

The liquid passing through the filter residue layer and the filter medium must restrain resistance, so there must be a pressure difference on both sides of the filter medium, which is the driving force to complete the filtration. Increasing the pressure difference can speed up the filtration, but the deformed particles under pressure are likely to block the pores of the filter medium when the pressure difference is large, and the filtration slows down.

Suspension filtration has three methods: filter residue layer filtration, deep layer filtration, and sieving filtration.

The filter residue layer filtration means that the initial filter residue layer is formed after the initial stage of filtration. Thereafter, the filter residue layer plays a major role in filtration. At this time, both large and small particles are trapped.

Deep filtration means that the filter medium is thick the suspension contains solid particles are less, and the particles are smaller than the pores of the filter medium. When filtering, the particles are adsorbed in the pores after being filtered.

In the sieve filter, the solid particles trapped by the filter are larger than the pores of the filter medium, and the inside of the filter medium does not adsorb the solid particles. Filtration methods, such as a tumble filter screen, filter out coarse impurities in the sewage.

The three methods often occur simultaneously or sequentially in the actual filtration process. The processing capacity of the filter depends on the filtration speed. When the solid particles in the suspension are large and the particle size is uniform, the pores of the filtered filter residue layer are relatively smooth, and the filtrate passes through the filter residue layer at a relatively high speed. The use of a coagulant to aggregate fine particles into larger agglomerates helps to increase the filtration speed.

For the suspension with a fast sedimentation rate of solid particles, the filter applied in the upper part of the filter medium is applied so that the filtration direction is consistent with the law of gravity, and the coarse particles are first settled, which can reduce the clogging of the filter medium and the filter residue layer; in the difficult-to-filter suspension ( If the solid particles such as diatomaceous earth and expanded perlite are mixed into the colloid, the filter residue layer can be loosened; when the viscosity of the filtrate is large, the suspension can be heated to lower the viscosity. These measures can speed up the filtration process.

The filter residue layer plays a major role in filtering. At this time, both large and small particles are intercepted; deep filtration means that the filter medium is thick and the suspension contains There are few solid particles.

When filtering, the particles are absorbed in the pores after entering; sieve filtration means that the solid particles trapped by the filter are larger than the pores of the filter medium, and the inside of the filter medium does not absorb solid particles. Filtration methods, such as rotating drum filter sieves filter out coarse particles in sewage.

Vacuum filtration generally improves the stability and reliability of the vacuum system. A vacuum filter is installed between the suction cup and the vacuum valve (vacuum generator) to collect dust and other pollutants sucked in from the air together to protect the components in the vacuum system from malfunctioning due to atmospheric pollution.

To further improve the vacuum system’s Reliability. In most cases, installing a sound reducer on the vacuum, the exhaust port of the vacuum pump, and the exhaust port (intake port) of the vacuum valve can enhance the filter effect in advance of reducing noise.

Vacuum Filtration mainly puts pressure on the filtering mixture of solid and liquid material to pass the liquid through the filter. This technology is the practical application of Bernoulli’s Principle of pressure Reduction and is widely applied in the production of medium and buffer materials.

It is a kind of chemical laboratory technology that could permit a higher filtration rate than a normal filter process where the pressure gradient works so that the processing time can be shortened. The advantage of this filtration could provide a variable rate according to the intensity of the vacuum pumps, which is mainly applied in microbiology and laboratory procedures and refers to collecting particles (bacteria, sediment, etc.) from the liquid suspension.

Advantages and vacuum filtration principle

Vacuum filtration relies on creating a pressure difference, using vacuum pressure to drive the liquid through a filter, separating it from solid particles. This vacuum filtration principle accelerates the filtration process, enhancing efficiency and consistency in laboratory applications.

The vacuum filtration principle and compressed air filtration are very different. One is to collect pollutants (mainly dust), mainly relying on suction to provide power to the filter, and under vacuum, it performs negative pressure filtration; while compressed air filtration, the filter filters the compressed air for impurities and pollutants to achieve the effect of gas cleaning.

The important performances of vacuum filtration include low binding, quick flow speed, and high throughput. In addition, it could eliminate the risk of pollution, leakage, and waste of time. Moreover, it could also improve security and ergonomics by removing repetitive lifting and pouring.

But please notice that the excess vacuum is forbidden in case of a fracture of the filter paper. The simplified working procedure and maximum filtration are the ultimate pursuit of vacuum filtration.

Advantages of vacuum filtration

The vacuum filter has a compact structure, and the filter element is easy to handle, such as confirmation of pollution degree, cleaning of related impurities and pollutants, and easy installation and simple operation.