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molecular sieve type 4A is composed of silicon (aluminum) octahedra, and the central polyhedron serves as the framework structure. The intermediate space of the framework is extremely empty, forming many well-arranged pores or channels. There are metal ions in the molecular sieve, and the framework space is filled with water molecules. Cations can be exchanged, and water molecules can be removed. Under certain conditions, the framework structure can also change. The characteristics of this structure are the inherent reasons for the various properties of molecular sieves.
The ion exchange and water action of the framework of molecular sieve type 4A are based on the sharing of two tetrahedra, which generate a large crystal void that can be occupied by positive ions and water, and these positive ions and water have very high mobility and can undergo reversible dehydration. Aluminum ions are exchanged on the framework of molecular sieve type 4A, with each aluminum ion carrying a negative charge, which can not only fuse with sodium ions but also with other positive ions. Calcium and aluminum ions can enter the original sodium ions occupied by large crystals in molecular sieve type 4A, replace the sodium ions in molecular sieve type 4A, exchange sodium ions in hard water, and achieve the purpose of water softening treatment. molecular sieve type 4A can quickly remove some harmful heavy metal ions in the solution, which is a key way to clean water.
The adsorption capacity of non-ionic surfactant molecular sieve type 4A is three times that of tripolyphosphate, sodium sulfate, and sodium sulfate. This has significant practical significance for adding a large amount of surfactants to high-concentration detergents during the conglomeration process. The liquid-carrying capacity of molecular sieve type 4A exceeds 30%. In the washing powder processing process, molecular sieve type 4A can improve the flowability of raw materials and adjust the shape, flowability, and anti-adhesion properties of the product. molecular sieve type 4A has excellent oil bonding ability. By adding potassium carbonate, cmc, sodium metasilicate, and sodium sulfate in zeolites, the adsorption of polyester fabrics can be significantly reduced.
According to different needs, molecular sieve type 4A powder can be synthesized or processed into white crystalline powder, strip, sheet or spherical, with a particle size range of 15m and an average particle size range of 15m, which is non-corrosive, insoluble in water and organic solvents, soluble in acid, and slightly soluble in strong alkali. When using molecular sieves, the pH of the medium should be controlled between 412. The pH value of the molecular sieve is stable within the pH 412 range, and other types change with their composition and structure. Generally, as the silicon-aluminum ratio increases, the stability of the basic medium decreases, and the acid resistance increases. With the increase of the water content of molecular sieve type 4A, its conductivity and thermal conductivity will also increase significantly.
Ion exchange selectivity.
Adsorption selectivity and efficiency. With different molecule sizes, polar saturation, and boiling points, molecular sieves have different adsorption and efficiency on different molecules.
Catalytic properties. molecular sieve type 4A has well-arranged crystal cavities and uniform pore size, composed of anions and cations, forming an electrical equilibrium with them.
These structural characteristics of molecular sieve type 4A make different types of molecular sieves and their components have different catalytic activities and selectivity in chemical reactions.
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