When filtering, a suitable microporous membrane must be selected according to the physical and chemical properties of the filter medium before use. There are many kinds of materials as microporous membranes, and their properties are different. Common microporous membranes are as follows:
(1) Water-based microporous membrane: generally used for filtration of pure aqueous phase. When filtering the mixed solvent containing the organic phase, the water filtration membrane should be avoided as much as possible to prevent the filtration membrane from being dissolved because the aqueous filtration membrane is generally made of a cellulose-based material. Cellulose membrane materials are characterized by good hydrophilicity, good pore-forming properties, and wide sources, but poor acid and alkali resistance and organic solvent resistance, and poor creep resistance. The water filtration membrane series includes: a cellulose acetate membrane, a nitrocellulose membrane, a mixed ester membrane regenerated cellulose membrane, polyethersulfone, and the like.
(2) Organic microporous membrane: used for filtration of organic solvents. Commonly used organic microporous membranes: polytetrafluoroethylene membrane (PTFE), polyvinylidene fluoride membrane (PVDF), polyvinylidene fluoride (3) mixed membrane filtration: generally used in water systems, organic systems. Mixed filtration membrane filtration: nylon membrane, modified polyvinylidene fluoride (modified hydrophilicity), polytetrafluoroethylene membrane (modified hydrophilicity), polyvinylidene fluoride membrane (modified hydrophilicity). Aliphatic nylon, good hydrophilicity, resistant to proper concentration of acid and alkali, not only suitable for aqueous solutions containing acid and alkali, but also for organic solvents, such as alcohols, hydrocarbons, ethers, esters, ketones , a homologue of benzene and benzene, dimethyl methyl net is a professional biochemical equipment website, integrating production, manufacturing and sales. It is an ISO9001:2000 certification unit. It is a professional enterprise that sells a wide range of biochemical equipment and a large scale.
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