Molecular sieves are used commercially to purify air streams and as desiccants to remove moisture or reduce humidity. This article focuses on what you need to know when buying a desiccant dryer, although the basic principles apply to other applications as well. Molecular sieves manufacturers FEIZHOU shares with you.
5A Molecular Sieve
The materials used in industrial molecular sieves have small, uniform pores. When other substances come into contact with the molecular sieve, molecules of the right size for the pores will be adsorbed. Molecules that are too large and unsuitable will not. Molecular sieves work at the microscopic level, so their sizes are measured in angstroms. Pore sizes 3A and 4A will adsorb water, while larger pore sizes will remove larger hydrocarbons.
There are four main types of molecular sieves: 3A, 4A, 5A and 13X. The type depends on the chemical formula of the molecule and the molecular sieve determines the size of the pores. Molecular sieves work by adsorbing gas or liquid molecules with an effective diameter larger than the pores, except for those with larger openings. The molecular sieve relevant to our field is type 3A. The molecular sieve used in insulating glass is called 3A.
3A molecular sieves, adsorb molecules with diameters larger than 3Å. These molecular sieves have a fast adsorption rate, often absorb water, break well contamination and contamination tells. These properties have both sieves and this. 3s molecular sieves in gasoline, polymerization and chemical gas and liquid drying refining petroleum and chemical industries.
Molecular sieves typically absorb water much faster than other desiccant air dryers, and they can reduce humidity to much lower levels than standard silica gel. They are also more effective than natural desiccants for applications above normal room temperature. When used properly, they can effectively reduce water molecules in specialized containers to 1 ppm, or reduce the relative humidity in a package to 10%.
Price is higher than other forms of desiccant dehumidification; however, molecular sieves are also more effective. The actual cost per unit and final value will depend on other factors such as the volume to be dehumidified and the degree of drying required. Although molecular sieves are approved for pharmaceutical use in Europe, they are not FDA approved for food or drug use in the United States.
Molecular sieves have excellent adsorption capacity and rates, even at elevated temperatures. They are the only desiccants that are selective for molecular size.
In a strictly scientific sense, many natural desiccant dehumidifiers (such as lime, clay and silica gel) also work by sieving water vapor molecules, but commercial molecular sieves are made from synthetic crystalline silica aluminates. Unlike desiccants found in nature, the control of pore size in the manufacturing process produces selective adsorption properties.
While some molecular sieves for the removal of alcohols and aromatics use pressure to regenerate the sieve, molecular sieves for water absorption are typically regenerated by heating. For most industrial uses, these temperatures range from about 250° to 450°F, similar to the baking temperature setting of a standard kitchen oven.
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