To Discuss Main Features, Working Principle, and Clean Method of Solvent Filters

Main features of the solvent filter

As a common device in chemical laboratories, the solvent filter (300mL Glass Solvent Filter, 500mL Glass Solvent Filter) can select different materials and filter membranes with different pore sizes according to the needs of the operator to remove impurities in the solvent and get purifying and sterilizing results.

In the chromatographic analysis, the solvent filter can not only effectively extend the service life of the chromatographic column, but also significantly improve the data accuracy of the analysis system due to its vacuum degassing effect. Made of extra-hard glass, with uniform wall thickness, high-pressure resistance, high acid and alkali resistance, good interchangeability, the solvent filter bottle device’s extreme temperature resistance can reach up to 270°C.

Applications of the solvent filter

The solvent filter is mainly used in liquid chromatography mobile phase filtration, particle matter analysis, and microbial contamination detection. As excellent equipment in the chemistry lab, the vacuum filtration unit is mainly used for liquid chromatography mobile phase filtration, particle matter analysis, and microbial contamination detection. Using borate glass or 316L sanitary stainless steel as a material and autoclaving at 121°C, it can filter various aqueous solutions, organic matter, and corrosive liquid in the analysis.

300ml Glass Solvent Filters Supplier vacuum filtration

Working principle of the solvent filter

When the solvent filter is working, the liquid to be filtered enters through the nozzle, flows through the filter screen, and enters the pipeline required by the user through the outlet for process circulation. The particulate impurities in the liquid are trapped inside the filter screen. With such a continuous cycle, more and more particles are intercepted, and the filtering speed becomes slower and slower, while the imported sewage is still continuously entering, and creates pressure between the inlet and outlet, as the filter holes will get smaller and smaller.

When the large difference reaches the set value, the differential pressure transmitter transmits the electric signal to the controller, and the control system starts the drive motor to drive the shaft to rotate through the transmission assembly. Meanwhile, open the sewage outlet, and discharge from the sewage outlet. After cleaning, the pressure difference drops to a small value, the system returns to the initial filtering state, and the system operates normally.

The filter is made of a shell, multiple filter elements, a backwashing mechanism, and a pressure difference controller. The transverse partition in the shell divides the inner cavity into upper and lower cavities, and the upper cavity is equipped with multiple filter elements, which makes the filter space sufficient and significantly reduces the volume of the filter. The lower cavity is equipped with a backwashing Sucker.

During operation, the cloudy liquid enters the lower cavity of the filter through the inlet, and then enters the inner cavity of the filter element through the baffle hole. The impurities larger than the gap of the filter element are intercepted, and the clean liquid passes through the gap to reach the upper cavity, and then is sent out from the outlet. The solvent filter can effectively remove particles of different sizes in the liquid, so as to achieve the purpose of liquid filtration, purification, separation, and recovery.

Clean of the solvent filter

Solvent filters have a service life, which many users do not know. When the mobile phase is unqualified and contaminated, microorganisms and algae grow in the solvent bottle, which will shorten the service life of the filter, and will affect the performance, and cause blockage, air bubbles, and so on. It is recommended to clean or replace it with a new filter every 3 months. In addition, there is also a small glass device, also called a solvent filter. This solvent filter is used to filter the organic or aqueous mobile phase before the mobile phase is put into the solvent bottle, and an external vacuum pump is required.

If the solvent filter is clogged, or the sieve plate is discolored after a long time, how to clean it?

1. Remove the solvent filter from the connection of the pipeline;
2. Rinse the remaining mobile phase with pure water;
3. Place the filter in 35% concentrated nitric acid for about 1 hour;
4. Take it out and clean it with pure water, otherwise, it will damage the chromatographic column;
5. Put the filter back in place.

Remember that the organic solvent filter cannot be cleaned with an ultrasonic cleaner. The glass particles may shatter and cause a blockage. If it is a stainless steel solvent filter, it can be placed in isopropanol for ultrasonic cleaning for about 20 minutes.

How to judge whether the solvent filter is clogged?

To judge whether the solvent filter is clogged, you can remove the solvent inlet line from the instrument, because the pipeline is full of the mobile phase. If it is not clogged, the mobile phase will flow out freely from the pipeline. Otherwise, no mobile phase will flow out or only a very small amount of outflow.