Silica gel IBCS

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Silica gel IBCS

 

Silica gelis a dried gel formed from supersaturated solutions of silicic acids (nSiO2·mH2O) at pH 5-6. Solid hydrophilic sorbent.

It turns out upon acidification of solutions of silicates of alkali metals, followed by washing and drying of the formed gel:

 

According to GOST 3956-76 silicagel are distinguished:

· at the form of grains (granulated or lump);

· at the grain size (large and small);

· at the pore sizes (macroporous and microporous).

There four-letter designation of the silica gel according to GOST 3956-76.

· 1-I the letter characterizes the grain size (large, M — small And — activated, W — charge);

· 2-I the letter always (siliconegel);

· 3-I letter pore size (macroporous, M — microporous);

· 4-I letter form of particles (G — granular, lumpy).

Distinguish hydrogels (Aquagel), in which the pores are filled with water, alcogel (alcohol gel), xerogels, in which the gel is removed a liquid medium aerogels (dried in the autoclave when heated above the critical point).

Also there are silikagele special purpose, for example, silica gel indicator humidity (saturated with cobalt salts, as they absorb moisture and reduce activity granules change their color from blue to pink), silicagel for chromatography, silicagel for household refrigerators and several others.

· Silica gel obtained by interaction of sodium silicate with acid, alkaline silicate, salt ammonium from concentrated sols of colloidal silica

· Dilution solutions at low pH values, and temperatures below room.

· Hydrolysis the silicon compounds (silicon chloride, orthosilicic esters).

Commodity silica gel is produced in the form of grains or spherical granules of size from 5-7 to 10-2 mm. Various grades and silica gels have an average effective pore diameter 20—150Å and a specific surface area of 100-1000 m2/g.

Main application silicagel find for drying air, carbon dioxide, hydrogen, oxygen, nitrogen, chlorine and other industrial gases.

Ability silica gel to absorb significant amounts of water are used for drying various liquids, particularly in the case where the dehydration fluid poorly soluble water (drying of halogenated liquids such as freon). Silicagel also serve as dehumidifiers for preservation of the equipment to protect it from corrosion.

Along with water silicagel good pair absorb many organic substances. These property used for the capture (recovery) of gasoline vapors, benzene, ether, acetone, etc. from the air, benzene from coke oven gas and gasoline from natural gases.

Property silica gel to absorb many substances from the liquid phase is used in industrial the purification of various oils, in the desulfurization of oil cuts and removal of oil high-polymeric resinous substances.

 

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