The Effect of Adsorption Drying is Better When Activated Alumina and Molecular Sieve are Used Together
Activated alumina is a white ball material, special process, because it has a unique structure, with active ingredients, so the product is very strong, and the products were distributed evenly, aperture size, big entrance bibulous rate is high, small volume density, good mechanical performance, good stability, suitable for desiccant, fluoride, can also be used for fluoride, peroxide, hydrogen peroxide, etc.
Activated alumina is a widely used compressed air dryer. It has a lot of surface hardness and compressive strength, static pressure under the action of not easy to break, not easy to wear under the action of alternating pressure, so compressed air dehydration is appropriate; Activated alumina specific surface area of 260-380m2 / g, adsorption capacity can be used for high humidity gas drying.
Molecular sieve is characterized by its large specific surface area of 300 ~ 1000m2 / g, and the internal crystal surface is highly differentiated, which is also a kind of solid acid, with a very high acid concentration and acid strength. It can lead to carbon ion type catalytic reactions. When other metal ions in the solution and exchange, can adjust the pore size, change its adsorption performance and catalytic performance, so as to obtain the different performance of molecular sieve catalyst, molecular sieve is refers to has uniform microporous, can selectively adsorb diameter is smaller than the pore size of a large class of molecular adsorbent.
Molecular sieve for compressed air drying is mainly 3A, 4A and 5A, etc. Its main feature is that it has a very simple surface aperture, a specific surface area of 800-1000m2 / g, a low water content and high temperature, and can be dried at depth. Adsorption of water molecular sieve at the same time, also can absorb carbon dioxide and acetylene.
The use of activated alumina desiccant and molecular sieve, usually in the case of high, than in the case of high drying effect, molecular sieve breaking strength is not high, in the long-term use of the proportion can increase by 20%, easy to powder. In the treatment of high water content of the gas, should be pre-dried with activated alumina, and then molecular sieve removal of residual water.
So that it can prolong the service life of molecular sieve, can also strengthen the drying effect, alumina in the water content is relatively high, and high strength, high strength, molecular sieve in the relative humidity is low, good adsorption rate, activated alumina and molecular sieve collocation use, in order to achieve the best drying effect.
