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The Effect of the Hydrothermal and Thermal Deactivations on the Adsorptive Properties and Liquid Permeability of a Silica Gel

Three samples taken from a silica gel Hypersil were hydrothermally treated, washed, and dried under different conditions. The portions from the obtained samples were heated over a temperature range of 300 and 850 °C for 16 h. Surface area and pore volume of all the treated samples were determined respectively by nitrogen adsorption data at 77 K and mercury porosimetry. The volumetric flow rate and permeability of the isopropyl alcohol on the columns filled with the prepared samples were determined depending both the inlet pressure and packing pressure. The optimum conditions to prepare a column filling material with the heights permeability were discussed.