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Main types of ceramic membrane
Apr 13, 2018

Porous membrane

The configuration of porous ceramic membrane is mainly composed of three types: flat plate, tube type and multi-channel, and the plate membrane is mainly used for small-scale industrial production and laboratory research. The tubular membrane is combined to form a type of tube heat exchanger, which can increase the filling of the membrane. However, due to its strength problem, the industrial application has been phased out. The ceramic membrane of scale application usually adopts multi-channel configuration, that is, multiple channels are distributed on a circular section, and the general channel number is 7, 19, 37, etc. Main preparation techniques of inorganic ceramic membrane has: the preparation of solid particle sintering, carrier and microfiltration membrane, the ultrafiltration and nanofiltration membrane prepared sol gel method, using split phase prepared glass membrane, using special technology (such as chemical vapor deposition and electroless plating, etc.) preparation of microporous membrane or dense membrane, the basic theory related to material science of colloid and surface chemistry, material chemistry, solid-state ion, materials processing, etc.

Porous ceramic membrane with excellent high temperature resistance, solvent resistance, acid-proof alkaline can and the advantages of high mechanical strength, easy regeneration, in food, biological, chemical, energy and environmental applications. A research team of alumina and special sintering promoter as starting materials, under the sintering temperature of 1400 ℃ was the support body system and in-depth study of the permeability, mechanical properties and corrosion performance of unified support body. They also to predict hole structure of support material properties as the goal, to support the body, on the basis of the preparation process and microstructure property of raw materials and set up the supporting body calculation method between porosity, pore size distribution, pore structure support for a particular body preparation provides theory basis for the quantitative.

The filtration membrane

In August 2004, Wallace wins by Beijing technology co., LTD and shandong anti-lu pharmaceutical co., LTD. Of the ceramic membrane filtration systems used in some kind of separation and purification of antibiotics to be successful, this not only to optimize the production process of antibiotics, and to improve antibiotics yield by 15%, this is the ceramic membrane technology for the first time in China

It is used in the production of antibiotics. The separation and purification of antibiotics must be done through the filtration of the fermentation liquid and the resin exchange of the filtrated liquid. Many antibiotic production enterprise separation and purification of aminoglycoside antibiotics fermentation liquor adopts vacuum drum filter, this process need to dispatch the acidification of the fermented liquid to certain pH value, and then use vacuum drum filter aid layer laying filter for filtering, again with a plate and frame filter and resin exchange. This process is not only tedious, but also has a low yield of effective components, and the yield loss of filtration and resin exchange is 30%. While using the "Michael," and the "anti-lu" jointly developed by ceramic membrane filtration separation and purification system of some antibiotics, but it can make the effective component in the filtering process is lost nearly 5%, yield increased by 10% more than in the resin exchange process. Western developed countries in food industry, petrochemical industry, environmental protection, biochemical pharmacy and many other areas of the application of membrane technology is more and more widely, and made the prospects of the development of membranes of inorganic materials may be better than organic membranes. Policy prices for facing antibiotics and antibacterial restricted the dual pressure of many antibiotics production enterprises, through innovative technology to improve product yield and quality is a wise choice for cost reduction, and ceramic membrane technology to improve the current separation and purification of antibiotics process is likely to become the breach of the cost reduction and improve efficiency.

Packaging film

In the field of food packaging, it is remarkable that transparent ceramic membrane with high functionality and good environmental adaptability. Although the price of this membrane is high, the physical properties need to be further improved, but it is expected that in the near future it will play an important role in food packaging materials. The processing method of ceramic membrane is similar to that of the usual metal-plating method, which is basically based on the known processing method. The ceramic film is composed of PET(12 mu m) ceramics (SiOx). The silicon oxide can be divided into four categories: SiO, Si, O, Si, and SiO. In nature, however, they usually exist in the form of SiO, so they vary greatly according to the metallogenic conditions. The main requirements of this film is good transparency, good barrier property, excellent cooking resistance, better through microwave and good environmental protection and good mechanical properties. The ceramic coating can be made by the same conditions as aluminum coating. In the process of making, it is very important to carefully process the surface layer and not to damage the coating. Because of this is handled by silicon oxide film, has excellent surface wettability, therefore, it is in the ink or adhesives relatively wide range of options, with almost any ink or adhesives can affinity. Polyurethane adhesives are the most desirable adhesives, while inks can be chosen for any purpose without surface treatment. However, ceramic membrane plating like aluminum plating film easy to polyethylene (PE) composite, because PET film as the base material, when the silicon oxide table and direct melting high temperature coating or polyethylene (PE) composite, easy tend to elongation, undermining silica surface, led to the decrease of the barrier property. At the same time, due to the technical problems, the PET film will sometimes curl during the process of ceramic coating, thus affecting the quality of the film. Of course, such problems are being addressed.

The ceramic coating is first used as a condiment packaging material. Its excellent packing performance attracted people's attention. Because of the excellent quality of membrane protection, it is especially suitable for the packaging of easy to sublimate products, such as tea (camphor) and other volatile materials. Due to its excellent barrier property, in addition to being high barrier property and for food packaging materials, packaging materials can also be used in microwave container as cover material is expected, in spices, precision machinery parts, electronic parts, drugs and medical equipment and other party and as packing material. With the further development of the processing technology, if the membrane is greatly reduced in cost, it will be rapidly popularized and applied.

Cell membrane

"863" plan of solid oxide fuel cell (SOFC) project of the new medium temperature solid oxide fuel cell the long-term development of ceramic membrane, the preparation of ceramic membrane technology used in the production of SOFC, the generally high temperature (1000 ~ 900 ℃) of SOFC stretches to medium temperature stage (700 ~ 500 ℃). The inorganic membrane research institute of China university of science and technology has developed a successful new medium temperature ceramic membrane fuel cell, which is a fuel cell with ceramic membrane as an electrolyte. After the thin film of the battery, the internal resistance of the battery has been reduced, and the output of useful power has been improved. In addition, the medium temperature has been achieved without the high temperature, and the operating temperature has been reduced to 700~500 meters. This new fuel cell inherits the advantages of the high temperature SOFC and lowers the cost. This kind of ceramic membrane fuel cell has a wide application prospect.

Heat insulation membrane

In August 2004, based on the metal film of the radio signal interference and easy oxidation of shortcomings, such as, Chinese figure technology company, to join hands in a famous German industrial research institutions to jointly develop into nanometer ceramic honeycomb technology, and will long technology unique vacuum sputtering technology used in the ceramic heat insulation membrane production, created the unique amber ceramic insulation film, solved the metal film insurmountable technical problems. There is no interference with the radio signal, especially the short-wave signal of the satellite. It is not oxidized because of the extraordinary stability of the ceramics, thus ensuring the consistent insulation performance. Never fade, the ceramic heat insulation film USES the inherent color of the ceramic, do not add any pigment, prison, the ceramic heat insulation film will not be like the dye metal will fade phenomenon. Super durable, ceramic insulation film has a shelf life of 10 years, the metal film is generally 5 years. The classic aesthetic feeling, like the glittering and translucent get rid of the beauty, the color is soft, has the most comfortable visual effect. The capsule was first used in the U.S. space shuttle and the international space station, and was widely used in automobiles, buildings, and maritime areas. Due to technical sensitivity, the product was not sold in China until 2003.

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