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Silica gel is a kind of colloid substance with characteristics of solid and its basic ingredient is silicon dioxide (SiO2).The physical structure of silica gel is with rich finely porous structure and high specific surface area. The surface area structure of silica gel is silicon hydroxy and so Silica gel has strong adsorption effect as well as selective adsorption and separate ion capacity vapour other polar substance and also has extensive uses in such fields as adsorption , drying, separation, purification and the preparation of high purified substance, etc. In the chemical engineering field, silica gel can be used as the catalyst or the carrier of catalyst.
Due to its chemical composition and physical structure characteristics , silica gel has the following advantages in the process of its application:
Stable chemical character , insoluble in any other solvent or solution except for hydrofluoric acid(HF)and alkali;
Good heat stability , Type A narrow pore silica gel can be used within 300℃,while other types of silica gel can be used for long term under the condition of high temperature 500-600℃.
Silica gel has the rigidity framework structure and also good wearability and crushing strength.Each kind of specification from silica gel series products has its own characteristics , which is resulted from the fact that different types of porous structure is obtained through controlling relevant processing conditions in the process of manufacture of silica gel in order to adapt itself to different application fields.
The general parameters of silica gel
Specific heat : Cp=0.22 Kcal/Kg·℃
Thermal conductance : 入=0.17Kcal/m·h·℃
Heat adsorption :Q=700 Kcal/Kg·H20
