This Is the Correct Way to Use Laboratory Solvent Filters

General introduction of laboratory solvent filters

Laboratory solvent filter devices are mainly used in liquid chromatography mobile phase filtration, particle matter analysis, and microbial contamination detection. They are standing equipment in chemical laboratories. The use of extra-hard high-quality glass material with uniform wall thickness, no bubbles makes it can be used for sterilization under high temperature and high pressure, with good sealing performance, fast flow, and standard grinding.

According to the needs of the operator, the solvent filter selects filter membranes of different materials and different filter pore sizes to achieve the effects of removing impurities in the solvent, purifying, and sterilizing. The filter membrane has a certain degassing effect to ensure the cleanliness of the mobile phase and prevent the blockage of the HPLC liquid circuit. The use of filtered solvents can prolong the service life of the instrument and the chromatographic column and improve detection accuracy.

At the same time, it has also been widely used in gravimetric analysis, microanalysis, colloidal separation, and sterile experiments. Plus, in scientific research, instrument and chemical analysis, pharmaceutical and agricultural industry, sanitary inspection, and so on, it is used to detect and remove particles and bacteria to achieve liquid filtration. It is also suitable for hydraulic oil, high purity reagents, and water quality. Today, HAWACH will discuss how to use the laboratory solvent filters and check the following ten steps.

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How to use laboratory solvent filters

1. Before using the new filter, remove the sealing ring, and then soak it with 10% sodium hydroxide to saponify the oil, and then wash it repeatedly with water several times until it is completely clean.
2. For aseptic operation, the filter needs to be sterilized.
3. Place the filter membrane on the filter plate on the bottom of the cleaned filter, then cover the filter barrel and tighten the bolts.
4. Insulation and preheating. Before adding the liquid to be filtered, only low-temperature preheating is possible. The preheating temperature is ≤36°. Due to the inherent factors of metal heat transfer and uneven heating, the measuring point of the temperature control probe is in the temperature control box. The thermometer will display between 36° and 58°.
5. When the preheating temperature reaches the condition that the required filtered liquid does not agglomerate, add the liquid to be filtered. At this time, adjust the temperature control box to the required temperature degree. When the selected temperature is reached, the heating system will automatically cut off the power supply.
6. When the preheating and heating is completed, seal the upper cover of the road opening, open the pressurized air inlet valve, and gradually pressurize from 0.05Mpa—0.1Mpa—0.2Mpa—0.3Mpa. Meanwhile, discharge the liquid from the filter lower port.
7. When the pressure reaches 0.3Mpa, the lower part of the filter does not discharge liquid. At this time, it means that the filter membrane is clogged or the accuracy of the filter membrane is too high, and the filtration accuracy of the filter membrane needs to be adjusted.
8. After filtering, close the pressure valve and make the pressure of the filter pressure gauge return to 0 before opening the filter cartridge to take out the material. When the filter is under pressure, it is strictly forbidden to open the pouring port and the filter cartridge to avoid the occurrence of Human injury.
9. When the filter has no pressure, open the upper filter cartridge and you will see the solids on the filter membrane. Take out the solids and complete a cycle of filtration.
10. After each experiment, please clean the laboratory solvent filter and spare it.