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Working principle of silica gel desiccant

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Working principle of silica gel desiccant

Release date:2018-01-22 Author: Click:

Silica gel desiccant is mainly sodium silicate and sulfuric acid reaction, and aging, acid bubbles and a series of post-treatment process is obtained, do not dissolve in water and any solvent, non-toxic and tasteless, chemically stable, in addition to alkali, hydrofluoric acid Outside does not react with anything. Its chemical and physical properties have given silica gel good moisture absorption capacity. Silica gel as a desiccant, the drying principle is to rely on adsorption to remove moisture molecules in water, that is, through the solid surface of the particle and a variety of gases, liquids and other water molecules to each other attraction and adsorption on the solid material surface Most of these substances have many pores and huge surface area. Silica gel can be made by reacting soluble silicate with hydrochloric acid. The actual reaction process is very complicated. The reaction equation can be written as follows: Silicic acid is not very soluble in water but precipitates imtely after its ion, Condensation occurred between the ion of silicate gel. Silica gel will be fully washed to remove soluble salts, dehydration, which becomes porous solid material, called silica gel. Under normal humidity environment, the dosage of one cube is about 500 grams, but the amount of silica gel desiccant can be increased or decreased according to the level of environmental humidity, so as to achieve a more reasonable and correct moisture absorption effect.


Silica gel itself is a neutral substance, except with strong alkali, strong acid reaction under certain conditions, it will not react with any other substance. Is a direct contact with drugs, food desiccant used. As a desiccant with a desiccant adsorption physical desiccant, in addition to silica gel, there are activated carbon, activated alumina and so on.


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Key words:Silicageldesiccantmanufacturers,Fooddesiccantmanufacturers,Containerdesiccantsupplier

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