Introduction: With the progress of the times, molecular sieve desiccants are becoming more and more widely used in industrial applications. However, many people cannot specify the types and routes of molecular sieves. The following are details of molecular sieves.
The specific application of molecular sieves: mainly used for petroleum pyrolysis gas, alkynes, refinery gas, oil field gas drying, is chemical, pharmaceutical, hollow glass and other industrial desiccants.
Molecular sieve A lanthanide compound with a cubic lattice, mainly composed of ** through the oxygen bridge connected to the empty skeleton structure, the structure has many holes with uniform pore size and well-arranged, large internal surface area of ​​the hole. In addition, it also contains metal ions with lower electric valence and larger ionic radius and water in a chemical state.
Since the water molecules are continuously lost after heating, the crystal skeleton structure does not change, and many cavities of the same size are formed. The cavities are also connected by many micro-holes of the same diameter. The diameters of these tiny holes are even and uniform. Small-diameter molecules are adsorbed into the interior of the pores, and they are excluded from the pores. Therefore, molecules with different shapes and diameters, molecules with different polarities, molecules with different boiling points, and molecules with different saturation levels can be separated. When it is opened, it has the function of screening molecules, so it is called molecular sieve. At present, molecular sieves are widely used in metallurgy, chemical industry, electronics, petrochemical industry, natural gas and other industries.
Molecular sieve types commonly used in the gas industry;
Type A: Potassium A 3A, Sodium A 4A, Calcium A 5A,
Type X: Calcium X 10X, Sodium X 13X
Type Y:, Sodium Y, Calcium Y
Molecular Sieve Desiccant: It has a strong moisture absorption capacity and is used for the purification and disposal of gases. Avoid direct exposure to air during storage. Molecular sieves that have been stored for a long time and that are already hygroscopic should be regenerated before use. Molecular sieve avoid oil and liquid water. When used, it should be kept from contact with oil and liquid water. Dry processing gas in industrial production includes air, hydrogen, oxygen, nitrogen, argon, etc. Two adsorption dryers are connected in parallel, one is working, and the other can be regenerated. Alternately work and regenerate each other to ensure continuous operation of the equipment. Dryer work at 8-12 °C, heated to 350 °C under the air regeneration. Different specifications of molecular sieve regeneration temperature is slightly different. Molecular sieves have a good catalytic effect on certain organic gas phase reactions.
Potassium A (3A molecular sieves).
The product is mainly used for industrial desiccant such as chemical industry, petroleum, medicine, hollow glass, etc. It is used for unsaturated hydrocarbon materials, such as pyrolysis gas, butadiene, propylene, acetylene and other industrial dehydration. It can also be used for gas, polar liquid and Drying of natural gas. Due to the smaller pore size of Type 3A, co-adsorption of other molecules can be effectively controlled during the adsorption process.
- Molecular sieve applications
Drying dedicated molecular sieves for compressed air
Molecular sieves are widely used in compressed air treatment equipment after the dryer, because of its high temperature or relative humidity is very low, the ability to absorb water is much greater than other adsorbents. In combination with JZ-K1 Activated Alumina, the dew point is greatly increased to meet the customer's needs in certain types of suction dryers.
Air Separation Molecular Sieve
Molecular sieves are used in the air separation industry to purify the oxygen-nitrogen feed gas in the air, which has a very high efficiency. It can completely remove a small amount of CO2 and H2O impurities in the air that affect the oxygen-nitrogen separation performance, avoiding the phenomenon of freezing towers in the process of air separation distillation. It is a special adsorbent for air separation industry.
Drying of natural gas
Molecular sieves can be used for oil field associated gas, natural gas drying, to exclude water and other hydrocarbons other than methane. For example, it can adsorb H2O, H2S, CO2, SO2, CO, acetylene, ethane, ethylene, propylene and so on.
Petroleum cracking gas drying
Molecular sieves can be used in petroleum pyrolysis gas, etc., as well as water in dry industrial oils and liquid-phase dry C2-C7 wide-fraction petroleum hydrocarbons.
Dewaxing
Molecular sieves can be used to separate n-alkanes (ie, dewaxing) from petroleum and fractions. Dewaxed oil quality The excellent performance of aviation kerosene with low freezing point, the separated n-alkanes (paraffins) can be used as chemical raw materials for synthetic detergents.
Natural gas off*
Molecular sieves can be used for desorption (H2S, SO2, *alcohol and thiophene), and it is more suitable for the degassing of natural gas with low *, low water dew point, because it will also remove some of the water at the same time it is removed, making natural gas The water dew point is lower and it is more favorable to lose money.
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