DESCRIPTION OF ZEOLIT MOLECULAR SIEVE
Molecular sieve is a kind of cubic crystal aluminosilicate compounds, mainly composed of silicon and aluminum by oxygen bridge composed of open framework structure, the structure has many uniform pore size pore and neat, the internal surface area of big hole. In addition, metal ions and combined water with lower price and larger ionic radius are also included. Because the water molecules lose continuously after heating, but the crystal structure unchanged, formed many of the same size and cavity cavity, many of the same diameter pores connected, these tiny hole diameter size uniform, the ratio of the internal pore diameter of small molecules adsorbed to the cavity to the rejection ratio of channels molecular in the outside, so the molecular shape of different diameters, different degrees of polar molecules, molecules of different boiling points, from molecular separation of saturated in different degrees, which has "sieving" molecules, called molecular sieve. At present, molecular sieves are widely used in chemical, electronic, petrochemical, natural gas and other industries.
Zeolite molecular sieve is a hydrate of crystalline aluminosilicate salt.Its chemical formula is Mx/m[(AlO2)x·(SiO2)y]·zH2O M stands for cations, M represents its valence states, and Z represents hydration numbers, and X and y are integers.After activiation of zeolit molecular sieve,the water molecules are removed and remaining atoms form a cage structure with a pore size of 3Å to 10Å. In molecular sieves,there are many empty cavities of a certain size,and there are many holes with consistent a diameter (also called a window) connected between them. Because the molecular sieve can adsorb molecules smaller than its pore size into the cavities, the molecule with larger pore size is excluded from its cavities and plays the role of sieving molecule. Therefore,it is named as molecular sieve. Zeolite molecules can exist in nature and have been artificially synthesized since 70s of the last century.
CALSSIFICATION OF ZEOLITE MOLECULAR SIEVE
There are two kinds of zeolites: natural zeolite and synthetic zeolite. Most of the natural zeolite is formed by reacting volcanic tuff and tuffaceous sedimentary rocks in marine or lacustrine facies. More than 1000 kinds of zeolite ores have been found, 35 of which are more common, including clinoptilolite, mordenite, mordenite and zeolite. Mainly in the United States, Japan, France and other countries, China has also found a large number of mordenite and clinoptilolite deposits, Japan is the largest amount of natural zeolite mining countries. Due to the limitation of natural zeolite resources, zeolite has been widely used since 1950s.
The molecular sieves of commodities are usually classified by prefix numbers to classify the molecular sieves with different crystal structures, such as 3A, 4A and 5A zeolites. 4A is a table, a pore size of 4;. A type molecular sieve with Na+ denoted as Na-A, if the Na+ is K+ replacement, pore size is about 3 A, namely; 3A molecular sieve; such as Na-A 1/3 Na+ Ca2+ is more than about 5 a replacement aperture;, i.e. the 5A type molecular sieve.
FEATURES OF ZEOLITE MOLECULAR SIEVE
Molecular sieve powder crystal, with metallic luster, hardness is 3 ~ 5, the relative density is 2 ~ 2.8, the color of natural zeolite, zeolite is white, insoluble in water, thermal stability and acid resistance increased with the increase of SiO2/Al2O3 composition ratio. Molecular sieve has large surface area, up to 300 ~ 1000m2/g, within the crystal surface height of polarization, as a kind of efficient adsorbent, is also a kind of solid acid, acid concentration and acid strength of surface is very high, can cause the catalytic reaction of carbonium ion type. When the metal ion in the composition is exchanged with other ions in the solution, the pore size can be adjusted, and the adsorption property and the catalytic property are changed, so as to prepare a molecular sieve catalyst with different performances
APPLICATION OF ZEOLITE MOLECULAR SIEVE
ARTICLE | APPLICATION |
3A Zeolit Molecular Sieve | a) The drying of various liquids (such as ethanol) b) Air drying c) Drying of refrigerants d) Drying of natural gas and methane gas e) Drying of unsaturated hydrocarbons and cracked gases, ethylene, acetylene, propylene, butadiene |
4A Zeolite Molecular Sieve | a) Deep drying of gases and liquids such as air, natural gas, alkanes, refrigerants, etc. b) Preparation and purification of argon c) Static drying of pharmaceutical packaging, electronic components, and perishable materials d) Paint, fuel, paint, as a dehydrating agent |
5A Zeolite Molecular Sieve | a) Pressure swing adsprition b) Air purification,dehydration,and carbon dixoide |
13X APG Zeolite Molecular Sieve | a) The oxygen and carbon dioxide in the air are removed from the air by the cryogenic process of oxygen and nitrogen production |
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6-) ZEOLITE MOLECULAR SIEVE
Hollow glass molecular sieve can be simultaneously adsorbed hollow glass of water and organic residues, the hollow glass even at very low temperature keeps clear and transparent, and can fully reduce the hollow glass caused by great changes in seasonal and diurnal temperature of the strong pressure difference between the inside and outside, completely solve the ordinary insulating glass desiccant to hollow glass the expansion and contraction caused by distorted broken problem, extend the service life of the hollow glass.
7-) ZEOLITE MOLECULAR SIEVE POWDER
Molecular sieve powder is activated zeolite powder through molecular sieve dehydration, it has fast dispersion and absorption rate of good, in the industry, some special occasions: such as adsorption material mixing and dispersion and adsorption to amorphous desiccant and so on. The specific application in coating, paint, resin and some adhesive additives or aggregate, can reduce the moisture, eliminate air bubbles and improve the material product uniformity and strength can also do the desiccant in the hollow glass composite rubber strip.
PARAMETER
| Model | 5A |
| Color | Light Grey |
| Norminal pore diamster | 5 Angstroms |
| Shape | Sphere | Pellet |
| Diameter (mm) | 1.7~2.5 (8*12 Mesh) | 3.0~5.0 (4*8 Mesh) | 1.6 (1/16") | 3.2 (1/8") |
| Size ratio up to grade (%) | ≥98 | ≥98 | ≥96 | ≥96 |
| Bulk Density (g/ml) | ≥0.7 | ≥0.7 | ≥0.68 | ≥0.68 |
| Wear Ratio (%) | ≤0.20 | ≤0.20 | ≤0.40 | ≤0.40 |
| Crush Strength (N) | ≥35/Piece | ≥85 Piece | ≥30 Piece | ≥75 Piece |
| Static H2O2 Adsorption (%) | ≥21 | ≥21 | ≥21 | ≥21 |
| Static Hexane Adsorption (%) | ≥12 | ≥12 | ≥12 | ≥12 |
| Water Content | ≤0.5 | ≤0.5 | ≤0.5 | ≤0.5 |
| Typical Chemical Formular | 0.7CaO.0.3Na2O.Al2O3.2SiO2.4.5H2O (SiO2:Al2O3=2) |
APPLICATION
a) Rremove water,CO2,H2S from sour gas strems while mini mission COS formation.light mercaptans are also adsorbed. |
| b) Separation of normal - and iso parrafin`s |
| c) Production of high purity N2,O2,H2 and inert gas from mixed gas streams |
| d) Static (Non-regenerative) dehydration of insulating gass units,whether air filled or gas-filled. |
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| Adsorption usage | Air Compressor usage | Loading Diagram usage |
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| Adsorption Dryer usage | Loading Diagram usage | Air Dryer usage |