The effect of the presence of transformer oil in silica gel on sorption properties
Abstract
The work examines the influence of various factors, such as the number of cycles of air drying and thermal regeneration, as well as the presence of transformer oil in industrially produced silica gel of the KSMG brand, leading to a decrease in the sorption activity for water vapor. To explain the mechanism of reducing the sorption activity of silica gel, a set of studies was carried out, including an analysis of the oil content in silica gel samples using IR spectrometric, IR spectrophotometric and chromatographic methods. Oil was extracted from silica gel using carbon tetrachloride and hexane as extractants. Using the proposed methods, it was found that spherical silica gels of industrial production contain a residual amount of transformer oil in the amount of 0.08-2.1 mg / g. The obtained results allow us to conclude that the residual transformer oil present in silica gel undergoes thermal decomposition during the regeneration process, leading to the formation of carbon deposits that block the active centers of the sorbent, as a result of which the silica gel loses activity during operation. A decrease in the sorption capacity of silica gels for water vapor by an average of 30% after 20 cycles of drying humid air - thermal regeneration - is shown. Thus, the conducted studies allow us to conclude that the decrease in the sorption activity of industrial silica gel of the KSMG brand is due not only to the physical blocking of active centers by residual transformer oil, but also to carbonization of the active surface of silica gel as a result of its thermal decomposition during the regeneration process.
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