Filter, the filter prior to use media must be the appropriate choice of the physical and chemical properties of microporous membranes. Microporous membrane materials as there are many, and its performance are different.
Microporous membranes used are summarized as follows:
(1) water membrane: generally used for filtering water phase. Phase in the filter containing organic solvent mixture of water filters should be avoided to prevent the membrane is dissolved, because the water filters are generally made of cellulose material. Cellulose membrane material is hydrophilic characteristics of a good, good hole, wide variety of sources, but the acid and organic solvents is poor, poor creep resistance. Water filters range includes: cellulose acetate membrane, nitrocellulose membrane, regenerated cellulose mixed ester film film, polyether sulfone, etc.
(2) Department of microporous organic membrane: filter for organic solvents. Department of commonly used organic membrane: PTFE (PTFE), polyvinylidene fluoride film (PVDF), polyvinylidene fluoride
(3) mixed membrane filters: are generally used for water, common organic system. Hybrid membrane filtration: nylon membrane, modified polyvinylidene fluoride (modified hydrophilic), Teflon membrane (modified hydrophilic), polyvinylidene fluoride membrane (modified hydrophilic). Aliphatic nylon, good hydrophilicity, resistance to the appropriate concentration of the acid-base, not only for the pH of the aqueous solution containing, also suitable for containing organic solvents, for example, alcohols, hydrocarbons, ethers, esters, ketones, benzene and benzene homologues, dimethyl formamide, dimethyl sulfoxide, etc., is applicable to the widest range of micro-membrane.
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