Performance of microporous filtration membrane

The performance profile of microporous filtration membranes is as follows: CA (cellulose acetate) is suitable for aqueous solutions and has low protein adsorption; Nylon (nylon) is suitable for aqueous solutions and various organic solvents, with low solubility, protein adsorption, and sterilization; PTFE (polytetrafluoroethylene) is hydrophobic, resistant to all solvents, acids, and bases, and has low solubility; PVDF (polyvinylidene fluoride) is hydrophobic, resistant to various organic solvents (excluding halogenated hydrocarbons), and has low protein adsorption; PP (polypropylene) is hydrophilic, resistant to organic solvents, and has extremely low protein adsorption.

The filtration processes of microfiltration and ultrafiltration are usually carried out through direct current filtration (including surface filtration and deep filtration) and cross flow filtration. The most obvious difference between microfiltration membrane and ultrafiltration membrane is the pore size. Microfiltration membrane generally refers to a porous solid continuous phase with a pore size of 0.02-0.1um, uniform height, and sieve characteristics, while ultrafiltration membrane has a pore size of 0.002-0.2um and separation pressures of 0.01-0.3Mpa and 0.2-1.0Mpa, respectively.

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