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Bacteria Separation Film A Film Having A Function Of Separating The Fluid Mixture

The bacterial separation membrane is a film made of a polymer or polymer composite material having a function of separating the fluid mixture. Membrane separation is based on the selective permeability of the membrane, the separation of the membrane as a spacer layer, in the pressure difference, the concentration difference or potential difference between the driving force, the fluid mixture through the membrane through the membrane at different rates, On both sides of the enrichment, in order to achieve separation, refining, enrichment and recycling purposes. The amount of fluid through the membrane per unit time (through the speed), the ratio of different material transmission coefficient (separation factor) or rejection of a substance is an important indicator of membrane performance.

A film having a function of separating a fluid mixture prepared from a polymer or a polymer composite material. Membrane separation process is to use the separation membrane as the separation layer, in the pressure difference, the concentration difference or potential difference between the driving force, the fluid mixture through the membrane through the membrane at different rates, so that both sides of the membrane were enriched, To achieve separation, refining, concentration and recycling purposes. The amount of fluid through the membrane per unit time (through the speed), the ratio of different material transmission coefficient (separation factor) or rejection of a substance is an important indicator of membrane performance. The separation membrane is only assembled into a membrane separator to form a membrane separation system to carry out a practical material separation process. Generally there are flat membrane, tube film, roll membrane and hollow fiber membrane separation device. Membrane separation process is based on the pressure difference, the concentration difference or potential difference as a driving force to achieve.

The method of forming the separation film is a casting method, a poor solvent gel method, a direct polymerization method, a surface coating method and a hollow fiber spinning method.

The polymer material originally used as the separation membrane is a cellulose ester material. Polyphenylene oxide (see aromatic polyamide fibers), polytetrafluoroethylene (see fluororesin), polypropylene, polyacrylonitrile, poly Vinyl alcohol, polybenzimidazole, polyimide and the like. Polymer blends and blocks, graft copolymers (see polymers) are also increasingly used in the separation of membranes to provide properties that are not present in a single homopolymer. The method for preparing the polymer separation membrane is a casting method, a poor solvent gel method, a fine powder sintering method, a direct polymerization method, a surface coating method, a controlled drawing method, a radiation chemical etching method and a hollow fiber spinning method.

A homogeneous or heterogeneous mixture film with the ability to separate liquid - solid, liquid - liquid, gas - gas. A film composed of synthetic macromolecules, semi-synthetic macromolecules and natural macromolecules. It is also known as an organic separation membrane, which is different from the inorganic membrane. The polymer separation membrane can be an obstacle to active or passive mass transfer of adjacent two phases, and by means of this selective permeability, the fluid mixture is separated by the effect of pressure difference, concentration difference or potential difference. The separation process includes microporous filtration), ultrafiltration, reverse osmosis (ultrafiltration), gas permeation separation, pervaporation, dialysis and electrodialysis, liquid film (for transmission). The separation performance of the polymer separation membrane is determined by selectivity and permeability. The need for separation of the material and its selectivity and permeability requirements as high as possible, and for the need to retain the material requires the higher the selectivity, and the lower the better the permeability. The performance of the method for the unit time through the amount of fluid through the membrane and the ratio of material transmission coefficient. They must have a large value and keep a long time unchanged, only the value of industrial use, polymer separation membrane preparation methods are phase conversion method (phase inversion method), which includes dry phase conversion, wet phase Conversion, thermal gel method and polymer assisted phase conversion method, stretching method and irradiation method. With the change in membrane conditions can be obtained completely different performance of the separation membrane. The shape of the polymer membrane is hollow tube, hollow fiber type and flat type.