Views: 132 Author: Dasen Publish Time: 2018-12-31 Origin: Site
The ceramic membrane is an asymmetric membrane formed by a special process of inorganic ceramic material. It is one of inorganic membranes and belongs to the solid membrane material in membrane separation technology. It mainly uses alumina, zirconia and titania of different specifications. Inorganic ceramic materials such as silicon oxide are used as a support, which is formed by surface coating and high temperature firing. The filtration precision covers microfiltration, ultrafiltration and nanofiltration.
The ceramic membrane separation process is a fluid separation process in the form of "cross-flow filtration": the raw material liquid flows at a high speed in the membrane tube, and a clarified permeate containing a small molecular component is driven through the membrane in a direction perpendicular thereto. The turbid concentrate containing the macromolecular component is trapped by the membrane, so that the fluid can be separated, concentrated, purified, decontaminated, and sterilized.
Compared with the traditional polymer separation membrane material, the ceramic membrane has good chemical stability, acid resistance, alkali resistance and organic solvent resistance. High mechanical strength for back flushing. Strong anti-microbial ability, high temperature resistance, narrow pore size distribution and high separation efficiency.
Because the commercial ceramic membrane has a small pore size, it can successfully achieve molecular-scale filtration. Therefore, it is mainly used for filtering and separating liquid and gaseous mixtures, which can replace traditional centrifugal, evaporation, rectification, filtration and other separation technologies. The goal of improving product quality and reducing production costs has been widely used in the food industry, bioengineering, environmental engineering, chemical industry, petrochemical industry, metallurgical industry, etc., for separation, clarification, purification, concentration, Sterilization, salt removal, etc.
The disadvantages of the ceramic membrane are that the cost is high, the brittleness of the inorganic material is large, the elasticity is small, and the molding process of the membrane and the assembly equipment are brought to some difficulty.
1. Good chemical stability, acid, alkali and organic solvents, wide pH range.
2. High mechanical strength. Easy to regenerate and long service life.
3, good thermal stability, suitable for high temperature, high pressure systems.
4, the cleaning state is good. It is non-toxic and does not contaminate the separated system.
5. The pore size distribution rate is narrow and the separation precision is high.
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