 Silica gels used as desiccant and moisture resisting agent
Fine porous silica gel, B-type silica gel, C-type silica gel, macro-porous silica gel, Alusil, blue silica gel, DL blue silica gel, high effective desiccant, tablet form of silica gel desiccant, small packed silica gel, and FNG silica gel.
mainly used in -------------
static drying
moisture-proof packaging: cameras and photosensitive materials, precision instruments/electric appliances, foodstuffs, medicines, shoes, clothes, leather products, weapons, communications apparatus and materials, etc.
Air dehumidifying: closets, wardrobes, floor boards, , musical instruments, etc.
dynamic drying
drying of air: warehouses, ship's holds, pharmaceutical factories, precision machinery factories, electronic instruments and materials manufacturing factories, compressed air and ambient air about instruments.
dehydration and refinery of industrial gases: hydrogen, oxygen, nitrogen, chlorine, CO 2 , acetylene, ethene, methane, ethane, propane, SO 3 , SO 2 , natural gas, city gas.
dehydration of liquids
dehydration of organic solvents: methanol, ethanol, benzene, toluene, chloromethane, kerosene, gasoline, liquefied petroleum gas, hydrogen halide, liquid wax, acetone, etc.
dehydration of refrigerants: liquid ammonia, freon, dichloromethane, etc.
dehydration of transformer oil and inverter oil.
Features of these products are listed in the following table:
Fine porous silica gel |
higher adsorption capacity at low relative humidity, its dew-point temperature: - 40℃ ~ - 70℃ |
B-type silica gel
C-type silica gel
Macro-porous silica gel |
higher adsorption capacity at high relative humidity, suitable for use in those packages where humidity needs to be controlled or dew forming must be prevented. |
Alusil |
adsorption capacity at low relative humidity similar to fine porous silica gel, and that at high relative humidity better than fine porous silica gel; thermal stability is 150° C higher than fine porous silica gel |
Blue silica gel |
ambient relative humidity can be indicated by the change of its colour so as to judge whether the ambient humidity meets the set requirement and whether it is ineffective. |
Silica gel desiccant
tablet |
mainly used to prevent moisture for bottled medicines and foodstuffs. |
DL blue silica gel |
its colour begins to change when it has absorbed a certain amount of moisture and the change of colour will finish when the moisture absorbed reaches a prescribed amount ? a feature of colour change with quantitative adsorption. |
High effective
desiccant |
mainly used to dehumidify for precision instruments and apparatuses, higher adsorption capacity and having the ability to decrease the dew point to lower than - 70° C at normal temperature |
FNG silica gel |
not cracking when meeting with water, mainly used for air dehumidifying in air separation facilities and used as a buffer desiccant in ordinary silica gel protective bed |
Silica gels used as adsorbent and separating agent
Fine porous silica gel, B-type silica gel, C-type silica gel, pressure swing adsorptive silica gel, siliceous silt, FNG silica gel, beer silica gel, macro-porous silica gel, macro-porous micro-pellet silica gel, Alusil and column chromatographic silica gel are mainly used for the adsorption or separation of impurities in petrochemical industry, synthetic chemical industry, electric power stations and the refining process of organic chemicals. Their respective features are listed in the following table:
Macro-porous silica gel |
used for removing acids from transformer oil and as a decolorizing agent for |
Pressure swing
adsorptive silica gel |
fast-acting adsorption and desorption, mainly used in recovery and preparation of CO 2 in synthetic chemicals, foodstuffs and beverage industries. |
FNG silica gel |
mainly used as a liquid adsorbent in petrochemical, electrical and brewing industries, and for adsorbing acetylene in liquid oxygen preparation process. |
Siliceous silt |
mainly used as a padding material for cats, dogs and other small animals, featuring deodorization, cleanliness, money-saving and small quantity of garbage. |
Beer silica gel |
mainly used to adsorb high molecular proteins from industrial fermented goods |
Alusil |
mainly used as a temperature swing adsorbent to remove low molecular hydrocarbons |
Column chromatogra-
phic silica gel |
mainly used for removing aromatic hydrocarbons in petroleum refining, or separation and purification of effective constituents in traditional Chinese medicinal herbs |
Practical examples of applications: adsorption of vapors of ethanol, ether, acetone, benzene, gasoline and other organic solvents
adsorption, recovery or removal of SO2, H2O, N2O4, CO2, CO, acetylene, carbonyl chloride and other gases
separation of hydrocarbons from natural gas and its devulcanization
separation of aromatic hydrocarbons from paraffin
Silica gels used as catalyst or catalyst carrier
In this category there are macro-porous silica gel, B-type silica gel, macro-porous micro-pellet silica gel, C-type silica gel, fine porous silica gel, pressure swing adsorptive silica gel, FNG silica gel and Alusil, mainly used as catalyst carrier or catalyst in industries of petrochemicals, organic chemicals and synthetic chemicals. Two of this category are listed below:
Macro-porous
Micro-pellet
silica gel |
mainly used in the synthesis of melamine, benzoic anhydride, maleic anhydride, cis-polybutadiene rubber, vinyl cyanide, etc. |
| Macro-porous blocky silica gel |
used as a catalyst in manufacturing benzoic anhydride, etc. |
Silica gels used in chemical analysis and test
In this category there are thin layer chromatographic silica gel, column chromatographic silica gel, liquid chromatographic stationary phase silica gel, silica gel plate, silicic acid, activated silica gel, mainly used in the analysis and separation of natural and synthetic organic matters, the qualitative and quantitative analysis of major constituents or impurities contained in medicines, pesticides, traditional Chinese herbal medicinal materials, cereals, foodstuffs and organic chemicals, or the separation and refining of some substances. Some of these silica gels are listed below:
Thin layer chromatographic
silica gel |
used as the stationary phase in thin layer chromatograph |
Silicic acid |
mainly used as a flux for chemical reagents and in the production of tungsten wire |
| Activated silica gel |
used as a carrier in the identification of harmful and poisonous gasses in the atmosphere and in the monitoring of flammable and explosive gasses |
|
