Do You Know the Solvent Filter Well? Answer These Questions to Check

As a frequently used device in chemical laboratories, solvent filter brings much convenience and can be used in many applications. According to the needs of operators, filter membranes of different materials and different filter pore sizes can be selected to achieve the functions of removing impurities in the solvent, purifying, and sterilizing. The use of filtered solvents can prolong the service life of the instrument and the chromatographic column and improve detection accuracy. Its appearance is exquisitely made, the wall thickness is uniform, it can be autoclaved at 121°C, can resist extreme temperature changes up to 270 degrees, and has good pressure resistance.

What are the features of solvent filter?

Made of high-quality glass material, the solvent filter can be used for sterilization under high temperature and high pressure, with uniform wall thickness, and stylish appearance. The device is lined with a microporous membrane, which can be used for chemistry. Analysis, hygiene inspection, biological pharmacy and pesticide, petroleum, environmental protection testing, and other aspects of sample filtration, to detect and remove particles and bacteria in the liquid, mainly used in the filtration of water, organic and corrosive liquids for specific pollution the analysis of substances have degassing effect to ensure the cleanliness of the mobile phase and prevent the blockage of the HPLC liquid path. It can also be used for sterility testing, culture sterilization filtration, and sterilization filtration of heat-sensitive substances.

In the middle of the solvent filter is an inner grinding mouth support device with a suction nozzle. In the center, there is a flat ground glass sand chip for supporting the filter membrane. It is called the filter head. The corresponding specifications are 1L and 2L; the lower end is an outer grinding mouth. The pressure-resistant container is called a triangular flask; the corresponding capacity is 1000ml and 2000ml, and it is equipped with special aluminum alloy clamps for tight connection of the entire device. The clamps are oxidized to resist chemical corrosion. It’s necessary to choose qualified filter membrane, and check the quality by soaking it for 24 hours. The filter membrane is divided into organic and water systems and should be distinguished.

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How to process?

Firstly, water enters through the nozzle, flows through the filter screen, and enters the pipeline during working. In the filter, the particle impurities are trapped. With such continuous circulation, more and more particles will be intercepted, and the filtering speed will be slower and slower, but the imported sewage will continue to enter, and the filter holes will become smaller and smaller, thus creating a pressure difference between the inlet and the outlet.

When reaching the set value, the differential pressure transmitter sends the electrical signal to the controller, and the controller starts the drive motor to drive the shaft to rotate through the transmission assembly. Meanwhile, the sewage outlet is opened and discharged. When the filter is cleaned, the pressure difference drops to a small value, the system returns to the initial filtering state, and the system operates normally.

There are upper and lower cavities divided by transverse partition in the shell. With multiple filter elements, the upper cavity makes the filter space sufficient and significantly reduces the volume of the filter. The lower cavity is equipped with backwashing sucker.

By removing different sizes particles in the liquid, the solvent filters achieve liquid filtration, purification, separation, and recovery. When in use, the liquid enters from the side or top of the filter container, and the filtrate is flushed into the filter bag from the top of the filter bag supporting the mesh basket. The filter bag expands due to the impact of the liquid and the uniform pressure surface so that the liquid material is in the entire filter bag. The surface is uniformly distributed, and the liquid passing through the filter bag is discharged from the liquid outlet at the bottom of the filter along the wall of the metal supporting mesh basket. The filtered particles and impurities are trapped in the filter bag to complete the filtering process.

How to clean?

In general, check it every six months and lubricate it regularly. A proper amount of oil should be added to the solvent filter before the operation to lubricate the activity. Oil seals on both ends of the solvent filter. Check each component, whether it’s loose or wear. Replace it in time.

Some operators open the solvent bottle directly, or simply cover it, and some operators use methanol and acetonitrile for mobile phase preparation that is not qualified. These are very easy to cause solvent pollution, not to mention harmful to the experiment operators. The direct consequence of this is that after a long time of accumulation, the solvent filter will be clogged, the pressure will rise, and the instrument will become abnormal. If so, cleaning is required. In summary, prevention is the key point. Cleaning is only a last resort. If it is not clean, you need to replace it with a new one.

What if the solvent filter is really clogged, or if the sieve plate becomes discolored after a long time, and you want to clean it, what do you need to do?
1. Remove the solvent filter from the street of the pipeline.
2. Use pure water to rinse the remaining mobile phase.
3. Soak the filter in 35% concentrated nitric acid for about 1 hour.
4. Use pure water to clean it, or the chromatographic column would be damaged.
5. Put it back

Please note, an ultrasonic cleaner is not allowed to clean the glass solvent filter, which may cause blockage. Every time you replace or check the inner membrane of the filter, take out the original membrane, drain the residual liquid in the sand core support plate (disc wire mesh plate) and the connecting hose, and then put it back into the membrane and cover the filter cup. It is to prevent the local negative pressure from causing the instantaneous breakdown of the diaphragm.