Application And Operation Process Of Wet-strengthened Filter Paper
Paper chromatography uses filter paper as an inert support. The filter paper fiber has a strong affinity with water, and can absorb about 22% of water, and 6 to 7% of the water is hydrogen bonded to the hydroxyl group of cellulose, which is difficult to remove under normal conditions. The affinity with organic solvents is very weak, so the general paper chromatography actually uses the binding phase of filter paper fibers as the stationary phase and the organic solvent as the mobile phase.
When the mobile phase passes the sample along the paper, the solute at the sample point is in water and the organic phase is continuously distributed. Part of the sample moves with the mobile phase and enters the solute-free zone. At this time, it is redistributed, and part of the solute enters the stationary phase (water phase) from the mobile phase. With the continuous movement of the mobile phase, various parts are continuously distributed according to their respective distribution coefficients, and move along the mobile phase, so that the material is separated and purified.
Fields for Application
Wet-strengthened filter papers are essentially used for pressure and vacuum filtration. Most of them are made of linters and refined pulp with higher cellulose content and lower ash content. The highest nominal particle retention efficiency of fine particles in wet-strengthened filter paper is to facilitate use with conical filter funnels. The delicate design shortens filtration time and prolongs the loading capacity. Moreover, the wet-strengthened filter paper is suitable to qualitative analysis application with standard filter grades.
Performance of Wet-strengthened Filter Paper
Wet-strengthened Filter Paper contains some chemically stabilized resin, which can greatly strengthen the wet strength without introducing impurities into the filtrate. The rough surface is designed to increase the loading capacity, and the presence of fine particles in a solution can bring cloudy suspension. It can work well even under high pressure and vacuum condition with fast filtration speed and good performance. Customized diameter or specification can be accepted in a reasonable price and guaranteed quality. Special designed folds on the surface are beneficial to filter resin solutions or gel precipitation filtration. Call us for complete information on products.
1. Fold the filter paper in half and fold it twice to form a 90 ° center angle.
2. Put the stacked filter paper in three layers on one side and open one layer on the other side to form a funnel.
3. The side of the filter paper should be lower than the side of the funnel. Pour some water into the mouth of the funnel to make the wet filter paper abut the inner wall of the funnel. Then pour the remaining clear water and set aside.
4．The lower end of the glass rod should be close to the lower side of the three layers of the funnel so that the mouth of the cup is close to the glass rod. The tendency of tilting along the glass rod flows into the funnel along with the liquid, and the liquid level cannot exceed the height of the filter paper in the funnel.
5. When the liquid flows down the funnel neck through the filter paper, check whether the liquid flows down the cup wall and pour it to the bottom of the cup.