The Difference Between Filter Papers, Why Use Filter Paper?
Difference between filter paper and normal paper
Different from ordinary filter paper, most paper is made of cotton fibers and is made in different ways for different purposes. Because it is made of fiber, the surface has numerous holes through which liquid particles can pass, while larger solid particles cannot, so the filter paper has the function of a filter. This property allows the mixing of liquid and solid substances to separate. The common shapes are filter paper disc and filter paper roll, mostly made of cotton fiber.
Ordinary filter paper vs ashless paper. Ordinary filter paper can only absorb 23% of the water, and can not achieve the filtering effect. Paper, on the other hand, is a thin sheet made of plant fibers. In addition to the performance of qualitative filter paper, ashless filter paper is purer and has a lower ash content (less than 0.01%). The pH value of the water extract is between 5.0 and 8.0. Has good wet strength and resistance to dilute acid.
Filter paper is an effective filter medium, filter paper has been widely used in various fields. According to the composition of different types of filter paper fiber, filter paper performance, and use is not the same, there are ordinary occasions for the ordinary filter paper, and for high-temperature glass fiber filter paper, there is ultra-clean polypropylene filter paper. Paint filter paper is also known as v-type dry filter paper, organ-type spray cabinet filter, and paint mist filter paper (folding filter board). It is used in the dry spray room of new environmental protection products, it uses environmental protection filter paper. It makes spray oil/paint no more water, no more pollution! Can effectively filter paint, oil, glass raw materials, epoxy resin, asphalt, iron dragon, liquefied work-piece, plastic, porcelain, dye, and coating class.
The differences between filter paper and normal paper can be summarized as follows
- Porosity: Filter paper has a specific porosity that allows it to filter out certain particles, while normal paper does not have this property.
- Pore size: The pore size of filter paper is carefully controlled, while normal paper has a random distribution of pores.
- Thickness: Filter paper is usually thinner and more delicate than normal paper, to allow for efficient filtration.
- Resistance to chemicals: Filter paper is often treated with chemicals to make it more resistant to certain chemicals or solvents, while normal paper is not.
What is filter paper?
Filter paper filtration is actually the function of chromatography. Paper chromatography is based on filter paper as support. Filter paper fiber and water have a strong affinity, and can absorb about 22 percent of the water, and 6 to 7 percent of it is hydrogen-bonded to the hydroxide group of cellulose, which is difficult to remove under normal conditions.
Filter paper fiber and organic solvent affinity are very weak, so the general paper chromatography, in fact, with the combined water of filter paper fiber as the stationary phase, with organic solvent as mobile phase, when the flow down the paper after sample, the sample point between solute in water and organic phase in the continuous distribution, part of the sample with the mobile phase, into the area of the solute, at this time and redistribution, part of the solute from the mobile phase to stationary phase (water). With the continuous movement of the mobile phase, the different parts are continuously distributed according to their respective distribution coefficients and move along the mobile phase, so that the substances are separated and purified.
Why is filter paper used in chromatography?
In paper chromatography, filter paper is only a support carrier for the stationary liquid. It can be seen from the principle that the distribution coefficient of the solute in the sample is different between the stationary phase and the mobile phase. The mobile phase (such as water) rises due to capillary action, and the fixed flow is slower than the mobile phase, so the solute is separated. Paper fibers and water have a greater affinity and can absorb 20%-25% of water, of which about 6% of the water is combined with the paper fibers in the form of hydrogen bonds to form a composite.
To know more about chromatography, please click The Difference Between Filter Paper And Chromatography.
What is the purpose of filter paper in TLC?
The purpose of filter paper in TLC is used to test the presence of various materials, monitor the rate and process of the reaction, or determine the purity of the product.
Why use filter paper?
Filter paper for laboratory use is a common tool with researchers. Filter paper can be divided into qualitative and quantitative two kinds. In the application of analytical chemistry, after the inorganic compound precipitate is separated by filtration, the residue is collected on the filter paper, and the loss rate in the experiment can be calculated. Qualitative filter papers after filtration more cotton fiber generation, so only suitable for qualitative analysis; the quantitative filter papers, especially the non-ash filter paper, can resist the chemical reaction more effectively after special processing procedures, so the impurities generated are less, which can be used for quantitative analysis.
In addition to chemical experiment use, there is also frequent use of filter paper in daily life and engineering. Coffee filter paper is one of the widely used in daily life, and the filter paper on the outer layer of the teabag provides high softness and high wet strength. Other filter papers are air filter paper for testing suspended particles in the air, and fiber filter paper for industrial applications.
How to select filter paper correctly?
When selecting filter paper, the main considerations should be:
1. The higher the binder content in the filter material, the higher the tensile strength of the filter paper, the higher the efficiency during filtration, and the less the shedding. If the filter material background dust is small, its resistance is good, but the resistance will increase accordingly.
2. The smaller the fiber diameter, the better the interception effect of the experimental components, so the filtration efficiency is correspondingly higher.
3. The effective area is large, that is, the filter paper use area is large, can accommodate the dust volume is large, its resistance is small, its service life is long, relative to the cost is also increased accordingly.
Filter paper is divide into qualitative filter paper and quantitative filter paper, before we use filter paper, maybe we should know the Folding Method And Operation Steps Of Filter Paper and Precautions When Using Qualitative and Quantitative Filter Paper.