Molecular sieves are also known as zeolites or zeolites. A porous aluminosilicate having two major types of natural zeolite and synthetic zeolite, the composition formula of which is: Mx/n[(AlO2)x(SiO2)y]·mH2O, wherein: x/n- The number of metal cations Me (Na+, K+, Ca2+, etc.) having a valence of n. Mainly composed of silicon-aluminum through oxygen bridges to form an open skeleton structure, in the structure there are many pores with uniform pore size and well-arranged holes with large internal surface area.
Since the water molecules are continuously lost after heating, but the crystal skeleton structure is unchanged, many cavities of the same size are formed, and the cavities are connected by a plurality of micropores having the same diameter, and the molecules of the material having a smaller diameter than the pores are adsorbed inside the cavity. The molecules that are larger than the pores are repelled, so that molecules of different sizes and shapes are separated and act as a sieve molecule, which is called a molecular sieve. When a gas or liquid mixture molecule passes through such a substance, it can be separated from each other according to different molecular characteristics.
Molecular sieves are widely used in refining, petrochemical, chemical, metallurgical, electronics, and defense industries. They are also widely used in many fields such as medicine, light industry, agriculture, and environmental protection.
The carbon molecular sieve is a non-polar carbon material, and the main component of the carbon molecular sieve is elemental carbon, and the appearance is a black columnar solid. Because it contains a large number of micropores with a diameter of 4 angstroms, the micropores have a strong affinity for oxygen molecules, which can be used to separate oxygen and nitrogen in the air. Industrially, a pressure swing adsorption device (PSA) is used to prepare nitrogen.
Carbon molecular sieve has large nitrogen content, high nitrogen recovery rate and long service life. It is suitable for various types of pressure swing adsorption nitrogen generators and is the first choice for pressure swing adsorption nitrogen generator.