Is a hard, amorphous chain and network structure of silicate polymer particles, molecular formula SiO2.nH2O, is a hydrophilic polar adsorbent. It is the sulfuric acid treatment of sodium silicate solution to generate a gel, and washed with water to remove sodium sulfate and dried to obtain a glassy silica gel, which is mainly used for drying, gas mixture and the separation of petroleum components. Silicone industry is divided into two kinds of coarse pores and fine pores. Under the conditions of saturated relative humidity, the porous silica gel can adsorb up to more than 80% of the adsorbent weight, while at low humidity, the adsorption amount is much lower than that of the pore silica gel.
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