9/9/2023 0 Comments Cobalt chloride silica gel![]() ![]() Coarse-pore gel silica is mainly used to process the macromolecular protein contained in the beer as well as the drying of gas and liquid and defogging as well as dehumidification of gas upon high humidity, as the catalyst and catalyst carrier in the petrochemical industry. Pore silica gel is mainly used for the drying and purification of gas, the dehydration and purification of organic product, also used as a supported carrier. The textile industry uses it as sizing agent. Gel silica is mainly used for gas absorption or drying, liquid dehydration and liquid chromatography, also used as catalysts or catalyst carrier. General industrial silica gel has a mechanical strength of 85 to 95%, water content being below 2% and the moisture absorption rate of 25 to 30%. The silica gel can be manufactured through the reaction between water glass and sulfuric acid, and further gelling, washing, desalting, amidation, drying and screening. The pink silica gel has no absorbent capacity, but after thermal dehydration, it will have its color return back to blue and get its absorbent capacity restored. According the change of the color during dehydration and hydration of cobalt chloride, we can know moisture absorption condition of the silica gel. However, after absorbing water, the hydrated cobalt chloride will exhibit pink color with returning back to blue after drying. There is another kind of discoloration gel silica containing cobalt chloride with anhydrous cobalt chloride exhibiting blue color. According to the pore size, it can be divided into the fine-pore silica gel (with average pore size of less than 1.5 ~ 2.0nm) and coarse pore gel silica (with average pore size of greater than 4.0 ~ 5.0nm). ![]() The commercially available solid gel silica has spherical and irregular, two kinds of shapes. Silica gel can’t be dissolve in water, not soluble in other solvents except hydrofluoric acid and strong alkali. Therefore, it has strong absorption capability on the liquid or gas. The specific surface area per g silica can reach above 450 m2. Silica is a highly active, porous material with the internal surface area being large. nH2O, appears as slightly transparent white solid substance. ![]()
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