CHANGES IN THE PROPERTIES AND DISTRIBUTION OF PORES IN ACTIVE CLAY DURING PURIFICATION OF HYDROCRACKING OIL AND OXIDATIVE REGENERATION OF SPENT CLAY

UDC 553.611.6:665.761.6

 

Hryshyn Pavel Fedorovich – Senior Lecturer, the Department of Technology and Equipment of Oil and Gas Processing. Euphrosyne Polotskaya State University of Polotsk (29, Blokhina str., 211440, Novopolotsk, Republic of Belarus). E-mail: p.grishin@psu.by

Yermak Alexander Aleksandrovich – PhD (Engineering), Assistant Professor, the Department of Technology and Equipment of Oil and Gas Processing. Euphrosyne Polotskaya State University of Polotsk (29, Blokhina str., 211440, Novopolotsk, Republic of Belarus). E-mail: a.ermak@psu.by

 

DOI: https://doi.org/ 10.52065/2520-2669-2024-277-9.

 

Key words: adsorption oil purification, active clay, oxidative regeneration, adsorption isotherms, change of properties

 

For citation: P. F. Grishin, А. A. Yermak. Changes in the properties and distribution of pores in active clay during purification of hydrocracking oil and oxidative regeneration of spent clay. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2024. no. 1 (277), pp. 68–74 (In Russian). DOI: 10.52065/2520-2669-2024-277-9

 

.Abstract

The adsorption method is one of the ways to refine base oils in order to improve their quality and color. The aim of the work is to study changes in the properties of active clay during the adsorption purification of hydrocracking oil and after oxidative regeneration of spent clay. The properties of the initial, spent and regenerated clay were studied using the BELSORP MAX surface area and pore distribution analyzer. The true density of clay samples and the isotherms of nitrogen adsorption/desorption by them at 77 K. have been determined. The results of the analysis of nitrogen adsorption isotherms by clay samples using the Langmuir and BET adsorption models are presented. The analysis of the pore size distribution in the studied clay samples was carried out using the INNES method. It was found that during the adsorption post-treatment of hydrocracking oil, a decrease in the pore volume and specific surface area of the active clay is observed. At the same time, the bond strength of the molecules of the adsorbed substances with the clay surface decreases and its surface decreases. It is shown that the effectiveness of the adsorbent used in the process of adsorption post-treatment of hydrocracking oil is mainly determined by the polarity of its surface. The higher the polarity of the adsorbent surface, the greater its sorption capacity relative to the resins removed from the oil to be cleaned.

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09.11.2023