Abstract
An analytical scheme is proposed for monitoring the contamination of an alumina-modified silica gel adsorbent in the process of purifying natural gas with TP-22C components of turbine oil. The objects of the study were the samples of both the fresh adsorbent and the spent adsorbent in the process of purification of natural gas. The identification of turbine oil components on the adsorbents was carried out using the thin-layer chromatography on Sorbfil plates by separating the oil components on the thin layer of the sorbent in an upward flow of hexane with the subsequent determination of their presence by the sulfuric acid : formalin developer. The determination of additives in the adsorbent samples was carried out by the method of reverse phase high performance liquid chromatography according to the technique that included two-stage extraction of analytes with the hexane and acetone solutions, their re-dissolution in acetonitrile, and the ensuing analysis. The highest content of turbine oil was observed in the upper and middle layers of the modified silica gel. The conditions for the extraction of turbine oil components from the spent adsorbent have been optimized. Various extractants and their volumes for the greatest extraction of turbine oil components from the adsorbent were studied. The stability of turbine oil additives on the modified silica gel was studied during its high-temperature regeneration by modeling the adsorbent regeneration process under the conditions close to production. It is shown that some components of turbine oil were resistant to the regeneration. For example, additives D-157 and V-15/41, the concentrations of which were comparable before and after the regeneration. The proposed analytical scheme for determining the components of turbine oil on the real adsorbent sample was tested. When determining the thermally stable components on the spent modified alumina silica gel, the mass of turbine oil accumulated in the adsorbent over the entire service life was calculated and amounted to 9.5 g per 1 kg of adsorbent. Keywords: natural gas purification, silica gel, regeneration, turbine oil, additives, HPLC DOI: http://dx.doi.org/10.15826/analitika.2020.24.3.002 Yu.A. Ivanova, Z.A. Temerdashev, I.A. Kolychev, A. V. Rudenko Kuban State University (KubSU), ul. Stavropolskaia, 149, Krasnodar, 350040, Russian Federation
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