The Classification and Application of Silica Gel Desiccant
I. Introduction:Silica gel as a desiccant has many pores and a huge surface area. Its drying principle is to remove water molecules from moist substances by adsorption, that is, the particles on the solid surface attract water molecules in various gases and liquids and adsorb them on the surface of solid substances. It is insoluble in water and any solvent, non-toxic and tasteless, chemically stable, and does not react with any substance except strong alkali and hydrofluoric acid. The chemical composition and physical structure of silica gel beads determine that it has many characteristics that are difficult to replace by other similar materials, such as high adsorption performance, good thermal stability, stable chemical properties, and high mechanical strength.II. Classification:1. White Silica GelThis product is a white translucent glass, which cannot be used as an indicator. It is mainly used as a physical desiccant with adsorption.2. Blue Silica Gel:This product is a blue, translucent glass with a highly porous structure. High-purity blue silica gel is widely used in drying and absorbing water. During the process of absorbing water, its color changes from blue to pink. It can be mixed with general fine-pored spherical silica gel as an indicator to indicate the degree of water saturation of the desiccant.3. Orange Silica Gel: This product has the appearance of orange translucent glass particles, has strong adsorption capacity and its appearance color will change significantly with the increase of water absorption during moisture absorption. After absorbing water, the silica gel particles will change from orange to green, and when they become dark green, the product needs to be replaced or recycled. Since orange gel silica beads have a strong moisture absorption capacity, it should be stored in a dry environment, such as with shelves or pallets between the ground and the goods.4. Alumina Silica Gel:High quality alumina silica gel desiccant, with the appearance of white and milky white particles, has better adsorption and separation performance than ordinary silica-alumina gel. It is mainly used in catalysts and catalyst carriers, dryers, liquid adsorbents and gas separation in the petrochemical industry. In addition, It is also used to separate light hydrocarbons from natural gas, reduce the dew point of hydrocarbons, and produce natural gas gasoline. At the same time, natural gas is also dried. It can also be used as a common desiccant, catalyst and its carrier and also used as a pressure swing adsorption separator, especially suitable for high temperature temperature swing adsorption separator.III. Application:Silica gel desiccant are mainly used for drying and dehumidification. In addition, it is also widely used in natural gas drying, air compression systems, electronic equipment, oil and gas recovery hydrophobicity, catalyst carriers, pressure swing adsorption equipment, etc.
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