A Brief Introduction to Filter Membranes

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2022-06-29 14:51

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When developing analytical methods related to dissolution experiments and content of formulation samples, due to the influence of auxiliary materials, it is necessary to filter and continue the filtrate as a reagent solution. A filter membrane is required during the filtration process. The material and type of filter membrane sometimes have a significant impact on the sample, and different filter membranes need to be screened.
The thin film separation process is a method of separating mixtures using thin films. As a choice between two phases, thin films can intercept one or more components of the two phases and provide them to other components, thereby achieving separation, concentration, and purification between different components. It mainly utilizes the fluid pressure difference as the driving force for the screening and separation process. Microporous filtration, reverse osmosis, nanofiltration, and ultrafiltration are all pressure driven membrane separation technologies.
The microporous separation process is the process of using a membrane to select the size of separation components under the influence of fluid pressure difference, intercepting particles and macromolecular solutes that can be intercepted by the membrane pore, and allowing particles or small molecular solutes that cannot be intercepted by the mold pore to pass through the membrane.
The operation of microporous filtration membrane includes dead end filtration (vertical flow filtration) and cross flow filtration (tangential flow filtration). Dead end filtration is mainly used for fluids with low solid content and general processing scales, with most membranes being disposable. The filtration mechanism of microporous membrane is mainly interception.
1. Mechanical interception: refers to the screening effect. It refers to the function of the membrane to intercept impurities such as particles with larger or equivalent pore sizes.
2. Physical or adsorption interception: In addition to screening, other factors should also be considered, including the effects of adsorption and electrical performance.
3. Bridging effect: At the entrance of the hole, particles can also be intercepted due to the bridging effect.
4. Network interception function of network membrane. This interception is the retention of particles within the membrane, rather than on the surface of the membrane.

Microporous filter membrane,filter membrane

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