Membrane Filtration Technology
Membrane filtration technology refers to a membrane separation technology driven by pressure. Under a certain pressure, when the flows through the inner wall or surface of the membrane, the micropores in the membrane wall only allow substances of a specific molecular weight to pass through and become the filtrate. Substances in the original solution that are larger than the pores of the membrane are trapped on the liquid inlet side of the membrane and become concentrated liquid, thereby achieving the purpose of separating and concentrating the original solution.
Organic membrane filtration
Microfiltration membrane filtration technology(MF)
Microfiltration membranes usually refer to membranes with a retention accuracy of 0.1um and larger pore sizes, and are usually used for filtration of bacteria and suspended solids.
Ultrafiltration membrane filtration technology(UF)
Ultrafiltration membrane (UF) is a membrane process between microfiltration and nanofiltration. The molecular weight cutoff generally ranges from 1kD to 300kD. It is suitable for the separation, concentration and purification process of large molecular substances and small molecular substances.
Nanofiltration membrane filtration technology (NF)
A membrane with "nano-scale pores", which is between ultrafiltration and reverse osmosis. The molecular weight cutoff for organic matter is generally from 200 to 800D, and the interception ratefor divalent ions, especially anions, can reach 90-99%. It is especially suitable for Concentration and desalination of low molecular weight substances.
Reverse Osmosis Technology (RO)
When an external pressure is applied to a concentrated solution, and the pressure is greater than the osmotic pressure, the water in the concentrated solution will overcome the osmotic pressure and flow to the dilute solution through the semipermeable membrane, making the concentration of the concentrated solution greater. This process is the opposite of osmosis and is called reverse osmosis
Typical application areas of organic membranes
Antibiotics (erythromycin, cephalosporin concentrate…)Vitamins (colognic acid concentrate…)Amino acids (leucine, isoleucine decolorization and impurity removal)Organic acids (lactic acid, citric acid concentrate...)
Ceramic membrane filtration
Ceramic membrane is a kind of inorganic membrane. It mainly uses inorganic ceramic materials such as aluminum oxide and titanium oxide of different specifications as a support, and is made by surface coating (titanium oxide, zirconium oxide) and high-temperature firing. Commercial ceramic membranes usually have a three-layer or 3+ layer structure (support layer, transition layer and membrane layer), which is asymmetrical. Its pore size ranges from 0.8nm to 1μm, and its filtration precision covers microfiltration, ultrafiltration and nanofiltration levels.
Depending on the production capacity scale and the temperature sensitivity of the materials, the ceramic membrane system can be designed as an intermittent operating system or a continuous operating system.
Typical applications of ceramic membranes
Compared with traditional polymer separation membrane materials, ceramic membranes have the advantages of good chemical stability, acid resistance, alkali resistance, organic solvent resistance, high mechanical strength, reverse flushability, and high temperature resistance. Compared with traditional polymer separation membrane materials, ceramic membranes have the advantages of good chemical stability, acid resistance, alkali resistance, organic solvent resistance, high mechanical strength, reverse flushability, and high temperature resistance. It is widely used in the field of industrial biotechnology for clarification and filtration of fermentation broth.
Amino acids (Lysine, Threonine, Tryptophan, Isoleucine, Phenylalanine, Glutamine...)
Antibiotics (Erythromycin, Cephalosporins, Lincomycin, Colistin sulfate...)
Vitamins (Vitamin C, Vitamin B12, Vitamin B2)
Others (Yeast extract, 1,3- Propylene glycol, Succinic acid...)