Wide application of 4A molecular sieve

4A molecular sieve can adsorb molecules with a critical diameter not greater than itself; Molecular sieve is a kind of porous crystalline aluminosilicate material, which is widely used in the boring purification of various refrigerants because of its unique selective adsorption boring function. This paper introduces in detail the domestic and foreign development status of the specification of molecular sieve detergent for refrigeration system, and introduces the newly issued specification "spherical molecular sieve for refrigeration system" issued in July 2012, which contains the primary skill function and inspection method, which can help the refrigeration industry standard operators correctly apply the specification to achieve the expected purpose.

3A molecular sieve, also known as potassium A type (3A) molecular sieve, its pore size is 3A, which is mainly used to adsorb water, can adsorb critical diameter 3A molecules, and does not adsorb any molecules with a diameter greater than 3A. According to the industrial application characteristics, the molecular sieve has faster adsorption speed, more regeneration times, higher crushing strength and anti-pollution ability, improves the application efficiency of molecular sieve and prolongs the service life of molecular sieve, and is a necessary dry agent for deep drying, refining and polymerization of gas-liquid phase in petroleum and chemical industry. 4A molecular sieve can adsorb molecules with a critical diameter not larger than their own primary use: molecular sieve is mainly used for various liquids (such as ethanol), air, refrigerants, natural gas, methane A aluminosilicate compound with a cubic lattice, first composed of silicon aluminum through oxygen bridge connection to form an empty skeleton structure, in the structure there are many pore sizes uniform pore channels and well-arranged, large internal surface area of holes.

In addition, it contains metal ions with low electricity price and large ion radii and water in the combined state. Because the water molecules are continuously lost after heating, but the crystal skeleton structure remains unchanged, many cavities of the same size are formed, and the cavity has many micropores of the same diameter connected, these tiny pores have a uniform diameter size, which can adsorb molecules smaller than the diameter of the pore to the inside of the pore, and squeeze out molecules larger than the pore, so it can separate molecules with different shapes and diameters, molecules with different degrees of polarity, molecules with different boiling points, and molecules with different degrees of fullness, that is, it has the role of "screening" molecules. Therefore, it is called molecular sieve. 4A molecular sieve can adsorb molecules with a critical diameter not larger than itself, and molecular sieve is widely used in metallurgy, chemical industry, electronics, petrochemical, natural gas and other industries.