What is silica gel? Properties, classification and application of silica gel-Iota

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News > Dynamic industry > What is silica gel? Properties, classification and application of silica gel

What is silica gel? Properties, classification and application of silica gel

What is silica gel?
Silica gel is a kind of highly active adsorption material, which belongs to an amorphous material, and its chemical formula is nH2O - mSiO2. Insoluble in water and any solvent, non-toxic and tasteless, stable chemical property, except alkali, hydrofluoric acid, and not with any of the material reaction.
Various types of silica gel because of their manufacturing methods to form a different structure of the different. Chemical composition and physical structure of silica gel, which determines that it has many other similar materials difficult to replace the characteristics: adsorption performance, good thermal stability, chemical stability, high mechanical strength, etc.. According to the pore size of silica gel is divided into: macroporous silica gel, porous silica, silica gel, silica gel pore type B.
Silica gel by its nature and composition can be divided into two kinds of organic silica gel and inorganic silica gel. According to the composition of the extrusion of silicone and silicone rubber.
According to the pore size of silica gel is divided into: macroporous silica gel, porous silica, silica gel, silica gel pore type B. Because of the difference of the pore structure, the adsorption performance of the structure is different. Coarse pore silica gel under high relative humidity has a higher adsorption capacity, fine pored silica gel is under low relative humidity ceiling commanded higher than wide pore silica gel, and type B silica gel due to the pore structure between coarse and fine pores, the adsorption capacity between coarse, pore.
Inorganic silica gel according to its purpose, but also can be divided into beer, pressure swing adsorption silicone, silicone, silicone, silicone, silicone desiccant, silicone, silicone, silicone, etc..
Organic silica gel is a kind of organic silicon compound, it is a compound that contains Si-C bond, and at least one organic group is directly connected with the silicon atoms. Among them, to silicon oxygen bond (Si-O-Si) skeleton composed of polysiloxane, organosilicon compounds in number, of the deepest, the most widely used, accounting for more than 90% of the total amount of.
Silica gel is the main ingredient is silica, the chemical nature is stable, does not burn. Silica gel is a kind of amorphous silicon dioxide, should control the workshop dust content is not more than 10 mg / cubic meter, need to strengthen the exhaust, the operation wear masks.
Silica gel has a strong adsorption capacity, the human skin can produce a dry effect, therefore, the operation should wear a good working clothes. If silica gel into the eyes, need a lot of water to wash, and seek medical treatment as soon as possible.
Silica gel in the use of the process of adsorption of water vapor or other organic matter, the adsorption capacity of the decline, can be reused after regeneration.
Silica gel can be used as desiccant, and can be reused. Silica gel is a porous material, which is made of the mSiO2 - nH2O, which is suitable for dehydration. With open porous structure, the surface (the surface area of the unit mass) is very large, and it can adsorb many substances, which is a good desiccant, adsorbent and catalyst carrier. Silica gel adsorption is mainly physical adsorption, can be recycled and used repeatedly.
In alkali metal silicate (sodium silicate) solution, adding acid, so that the addition of a certain amount of electrolyte stirring, that is, the formation of a silica gel; or in a more concentrated sodium silicate solution in addition to acid or ammonium salt can also produce a silicate gel. The silica gel is set for a few hours to make the aging, and then use hot water to wash away the soluble salts, at 60 ~ 70 C and the activation at about 300 C. The silica gel can be dried and activated after immersion in a solution of cobalt chloride solution, which can be used to change the color of silica gel. Use it as a desiccant, the water is blue, after absorbing the red, from the change of color can be seen the extent of water absorption, as well as the need for regeneration.
Silica gel is also widely used in the recovery of steam, petroleum refining and catalyst preparation and so on.

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