Molecular sieves, 3 pellets, 1.6 mm
Zeolite3A
CAS: 308080-99-1
Molecular Formula: KnNa12-n[(AlO2)12(SiO2)12]xH2O
Molecular sieves, 3 pellets, 1.6 mm - Names and Identifiers
Molecular sieves, 3 pellets, 1.6 mm - Physico-chemical Properties
| Molecular Formula | KnNa12-n[(AlO2)12(SiO2)12]xH2O |
| Water Solubility | Insoluble in water. |
| Appearance | White powder or granule |
| Color | Yellow to yellow-green |
| Storage Condition | Room Temprature |
| Sensitive | Hygroscopic |
| MDL | MFCD00147627 |
| Use | Used as a desiccant |
Molecular sieves, 3 pellets, 1.6 mm - Risk and Safety
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R20 - Harmful by inhalation |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. |
| WGK Germany | 3 |
| TSCA | Yes |
| HS Code | 28421000 |
Molecular sieves, 3 pellets, 1.6 mm - Upstream Downstream Industry
| Raw Materials | Silicon dioxide kaolin Sodium silicate Aluminum sulfate Sodium aluminate Calcium chloride Aluminum hydroxide Sodium hydroxide Aluminum oxide |
Molecular sieves, 3 pellets, 1.6 mm - Nature
Open Data Verified Data
white powder or particles with cubic lattice, microporous structure. Tasteless, odorless, non-toxic, non-corrosive. Soluble in strong acid and alkali, insoluble in water and organic solvents. High thermal stability. Large surface area. It is an aluminosilicate polyhydrate. With a uniform microporous structure, is a good solid adsorbent and molecular sieve role, the polar molecules and saturated molecules have preferential adsorption, adsorption of gas and liquid can be desorbed, molecular sieve can be regenerated after application, repeated use.
Last Update：2024-01-02 23:10:35
Molecular sieves, 3 pellets, 1.6 mm - Preparation Method
Open Data Verified Data
thermal synthesis method: the water glass is boiled with steam to prepare an aqueous solution with a relative density of 1.2 to 1. 25, and impurities are removed by sedimentation, and the supernatant is taken for use. The solid aluminum hydroxide and sodium hydroxide were mixed according to the mass ratio of 1.2:1 and then heated and dissolved to prepare a sodium metaaluminate solution for use. In order to prevent hydrolysis of the sodium metaaluminate solution, it is preferable to use a freshly prepared solution. The water glass, sodium metaaluminate, sodium hydroxide according to a certain molar ratio (generally Al203 ; S102 ; Na20 ; H20-1 l2:3:185) are mixed, under stirring, the reaction was carried out at about 80 ° C. For 30min, and the resulting gel was heated to a constant temperature of 90 ° C. For 1H, and was further heated to 102 ° C. And crystallized at 2 ° C. For 4H to obtain a crystal powder. After filtration and washing, potassium chloride was added for ion exchange (exchange degree of 40%), and then filtration and washing, drying, kneading, shaping, burning and activation by adding a binder were performed to obtain 3A Molecular sieve.
Last Update：2022-01-01 11:03:29
Molecular sieves, 3 pellets, 1.6 mm - Introduction
Used for the drying of petroleum cracked gas and olefins. Drying of unsaturated hydrocarbons and cracked gases, ethylene, acetylene, propylene, butadiene, etc.; Drying of liquids (such as ethanol); Air drying in insulating glass; Drying of N2-H2 mixed gas; Drying of refrigerant.
Last Update：2022-10-16 17:24:29
Molecular sieves, 3 pellets, 1.6 mm - Use
Open Data Verified Data
for the drying of petroleum cracking gas and olefins.
Last Update：2022-01-01 11:03:28
Molecular sieves, 3 pellets, 1.6 mm - Safety
Open Data Verified Data
packed in a carton or drum lined with polyethylene plastic bag, net weight 20kg, 30kg. They were stored in a dry warehouse. Do not store and mix with strong acid or strong base. Mixing with oil or other liquid organic matter is prohibited. When loading and unloading should pay attention to light, to prevent packaging damage. Avoid water immersion. Toxicity and protection: inhalation of dust can cause "pneumoconiosis" lung sclerosis. Pay attention to dust prevention.
Last Update：2022-01-01 11:03:30
Molecular sieves, 3 pellets, 1.6 mm - Reference Information
| product characteristics | molecular sieve is an aluminosilicate compound with cubic lattice. it is mainly composed of silicon and aluminum connected by oxygen bridge to form an open skeleton structure. in the structure, there are many holes with uniform pore size and holes with neat arrangement and large internal surface area. In addition, it also contains metal ions with lower electricity price and larger ion radius and combined water. Since 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 cavities are connected by many micropores of the same diameter. These tiny pores have a uniform diameter and can be larger than the pores. Molecules with smaller diameter are adsorbed into the inside of the cavity, and molecules larger than the pore are excluded, so that molecules with different shapes and diameters can be used. Molecules with different degrees of polarity, molecules with different boiling points and molecules with different degrees of saturation are separated, which has the function of "sieving" molecules, so it is called molecular sieve. At present, molecular sieves are widely used in chemical, electronic, petrochemical, natural gas and other industries. |
| Molecular structure | The general formula for the chemical composition of molecular sieves is:(Mn )2/nO · Al2O3 · xSiO2 · pH2O,M represents metal ions (usually Na in artificial synthesis),n represents the valence of metal ions, x represents the molar number of SiO2, also known as the silicon-aluminum ratio, and p represents the molar number of water. The most basic structure of the molecular sieve framework is SiO4 and AlO4 tetrahedra, which are combined by common oxygen atoms to form a three-dimensional network structure. This combination forms cavities and pores with molecular level and uniform pore size. Due to different structures and different forms, the "cage"-shaped space holes are divided into "cage" structures such as α, β, γ, hexagonal columns, and faujasite. The crystal structures of A- type, X-type and Y-type molecular sieves are shown in the figure. Figure 1 The main structure of type A molecular sieve and the main structure of type X and type Y molecular sieve Because the AlO4 tetrahedron has a negative charge, it can be combined with sodium plasma to become electrically neutral. In aqueous solutions, Na is readily exchanged with other cations. Most molecular sieve catalysts are exchangers of polyvalent metal cations or H. Molecular sieves have acidity and selectivity to molecular size, and can be used as catalysts or supports. Silicon and aluminum atoms form an oxygen ring through oxygen, and the size of the oxygen ring determines the pore size of zeolite. The number of oxygen atoms per oxygen ring is 4~12. Usually, there are eight-membered rings (0.4~0.5nm), ten-membered rings (0.5~0.6nm) and twelve-membered rings (0.7~0.9 nm) with molecular sieve function. Y-type molecular sieve (x = 3.1~6.0) and mordenite (x = 9~11) with twelve-membered oxygen ring. The former can be used as a cracking catalyst and a bifunctional catalyst, while the latter can be used as a disproportionation catalyst for toluene. The ten-membered oxygen ring has some ZSM series molecular sieves such as ZSM-5 and ZSM-11. the eight-membered oxygen ring includes a-type molecular sieve (x = 2), t-type molecular sieve and ZSM-34, etc. Their pores are very small, and only linear hydrocarbons can enter the pores. The catalyst with molecular sieve as catalytic active component or main active component is called molecular sieve catalyst. Molecular sieve has ion exchange performance, uniform molecular size pores, excellent acid catalytic activity, and good thermal stability and hydrothermal stability. It can be made into a catalyst with high activity and high selectivity for many reactions. |
| molecular sieve catalyst | according to the catalytic properties, molecular sieve catalysts can be divided into the following points: (1) acid catalyst, using the surface acidity of molecular sieve for catalytic reaction. (2) bifunctional catalyst, molecular sieve can support platinum and palladium metals to obtain a bifunctional molecular sieve catalyst with both metal catalytic function and acid catalytic function. (3) shape-selective catalyst, because the catalytic effect of molecular sieve generally occurs in the inner space of the crystal, the pore size and pore structure of molecular sieve have a great influence on the catalytic activity and selectivity. The molecular sieve has regular and uniform intragranular pores, and the pore size is close to the molecular size, so that the catalytic performance of the molecular sieve changes significantly with the geometric size of the reactant molecules, product molecules or reaction intermediates. The main applications of molecular sieves as catalysts are shown in the table below. ▼ ▲ Catalytic process catalyst type catalyst example petroleum catalytic cracking hydrocracking solid acid bifunctional rare earth-Y type molecular sieve, ultra-stable-Y type molecular sieve palladium-ultra-stable Y type molecular sieve, molybdenum-nickel ultra-stable Y type molecular sieve, tungsten-nickel ultra-stable Y type molecular sieve C5 and C6 alkane isomerization diesel oil or lubricating oil Pro-hydrogen pour point setting selective reforming xylene isomerization toluene disproportionation alkylation (ethylbenzene synthesis) methanol synthesis gasoline bifunctional function, shape-selective dual function, shape-selective dual function, shape-selective solid acid, shape-selective solid acid, shape-selective solid acid, shape-selective platinum-mordenite palladium-mordenite, palladium-zinc-ZSM-5 molecular sieve palladium-wool zeolite, chabazite platinum-mordenite mordenite, ZSM-5 molecular sieve ZSM-5 molecular sieve ZSM-5 molecular sieve |
| molecular sieve use | 3A molecular sieve is mainly used for drying unsaturated hydrocarbons such as petroleum cracked gas, ethylene, and butadiene; polar liquids such as methanol and ethanol Drying, refrigerant drying; deep drying of kerosene and aero-engine; drying of nitrogen and hydrogen mixed gas. Desiccant for petrochemical industry, vacuum glass and other industries. 4A molecular sieve is one of the large amount of molecular sieve varieties in industry. It is mainly used for deep drying of air, natural gas alkanes, refrigerants and other gases and liquids; preparation and purification of argon; drug packaging, electronic components and perishable materials Static drying; dehydrating agent in paints, dyes and coatings. It can adsorb normal hydrocarbons and alcohol gases. It has high stability in weak acid medium. It can be used as drying and refining of petroleum, chemical, natural gas and other industrial gases. 13X molecular sieve can adsorb molecules with larger critical diameter, and is mainly used for gas drying and purification. It can effectively adsorb carbon dioxide, water, organic sulfide and other substances in the air. |
| main characteristics of common molecular sieves | 3A molecular sieves mainly adsorb water 4A molecular sieves are mainly suitable for deep drying of various chemical gases and liquids such as air and natural gas, freezing agents, drugs, electronic materials and variable substances, argon purification, separation of methane, ethane and propane. The selective adsorption performance for water is higher than that of any other molecule. 5A molecular sieve calcium type can adsorb C3-C4 n-alkanes, chloroethane, bromoethane, butanol, etc. in addition to the efficacy of 3A and 4A molecular sieves, and can be applied to the separation of normal isomeric hydrocarbons, pressure swing adsorption separation and co-adsorption of water and carbon dioxide. 13X molecular sieve silicon-aluminum ratio: SiO2/AL2O3 ≈ 2.6-3.0 is a special molecular sieve produced to meet the special requirements of the cryogenic air separation industry, further improve the adsorption capacity of molecular sieve for carbon dioxide and water, and avoid the phenomenon of freezing tower in the air separation process. It can also be applied to oxygen enrichment. Application: 1. Purification of raw gas in air separation unit (removal of water and carbon dioxide at the same time). 2. Desulfurization of natural gas and liquefied petroleum gas (removal of hydrogen sulfide and mercaptan) 3. Deep drying and purification of industrial gas can also be used as a carrier. 13X type can be adsorbed on 3A, 4A and 5A molecular sieves. |
| use | for drying petroleum cracked gas and olefins. Unsaturated hydrocarbons and cracking gas, ethylene, acetylene, propylene, butadiene, etc. drying; liquid (such as ethanol) drying; air drying in insulating glass; N2-H2 mixed gas drying; refrigerant drying |
Last Update：2024-04-09 21:04:16
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Product Name: Zeolite3A Request for quotationCAS: 308080-99-1
Tel: +86-17551318830
Email: r@reformchem.com
Mobile: +86-17551318830
QQ: 3787852685
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Product Name: Zeolite3A Request for quotationCAS: 308080-99-1
Tel: +86-17551318830
Email: r@reformchem.com
Mobile: +86-17551318830
QQ: 3785839865
Spot supply
Product Name: Molecular sieves type 3A Visit Supplier Webpage Request for quotationCAS: 308080-99-1
Tel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409
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Raw Materials for Molecular sieves, 3 pellets, 1.6 mm