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Adsorption
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===Silica gel=== [[File:THC 2003.902.070 Silica Gel Adsorber for NO2.tif|thumb|right | Silica gel adsorber for NO<sub>2</sub>, Fixed Nitrogen Research Laboratory, ca.1930s]] [[Silica gel]] is a chemically inert, non-toxic, polar and dimensionally stable (< {{convert|400|Β°C|F|disp=or|sigfig=2}}) amorphous form of SiO<sub>2</sub>. It is prepared by the reaction between sodium silicate and acetic acid, which is followed by a series of after-treatment processes such as aging, pickling, etc. These after-treatment methods results in various pore size distributions. Silica is used for drying of process air (e.g. oxygen, natural gas) and adsorption of heavy (polar) hydrocarbons from natural gas.
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