When performing filtration, it is essential to select an appropriate microporous membrane based on the physical and chemical properties of the solution being filtered. There are various types of microporous membranes available, each with unique characteristics suited for different applications. Commonly used microporous membranes include:
(1) Water-based microporous membranes: These are typically used for filtering aqueous solutions. They should be avoided when dealing with organic solvents, as they are often made from cellulose-based materials. Cellulose membranes are known for their good hydrophilicity, excellent pore-forming ability, and wide availability. However, they have limited resistance to acids, bases, and organic solvents, as well as poor creep resistance. Common water-based membranes include cellulose acetate, nitrocellulose, mixed ester membranes, regenerated cellulose, and polyethersulfone.
(2) Organic microporous membranes: Designed for use with organic solvents, these membranes are more resistant to harsh chemical environments. Examples include polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), and
OTHER synthetic polymers that offer better stability in non-aqueous systems.
(3) Mixed-membrane filters: These are versatile and can be used in both aqueous and organic systems. Common types include nylon membranes, modified polyvinylidene fluoride (with improved hydrophilicity), and PTFE or PVDF membranes that have been surface-modified for better compatibility. Aliphatic nylon, for instance, offers good hydrophilicity and can withstand moderate acid and base concentrations, making it suitable for both aqueous and organic solvent applications, such as alcohols, hydrocarbons, ethers, esters, ketones, and aromatic compounds.
In addition to these, there are specialized filtration membranes designed for specific industries, including biochemical, pharmaceutical, and environmental applications. Companies like Dimethyl Methyl Net specialize in providing a wide range of high-quality filtration equipment, combining production, manufacturing, and sales. As an ISO 9001:2000 certified company, they ensure reliable and professional service across various fields of biochemistry and laboratory equipment.
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