Cleaning of oil from hydrogen sulfide in hydrocyclone processors

DOI 10.32758/2071-5951-2020-0-01-32-34

Guevara E. С., Marushkin A.B., Sidorok P.V., Gilmutdinov A.T.

(Ufa State Petroleum Technical University – UGNTU, Ufa, ONIX-«Samara», Samara) E-mail: eimysguevara@gmail.com

Очистка нефти от сероводорода в гидроциклонных процессорах

Keywords: crude oil, hydrogen sulfide cleaning, hydrocyclone processor, non regenerable hydrogen sulfide neutralizer.

Abstract

The results of a pilot run to assess the effectiveness of removing hydrogen sulfide from Bashkortostan oils in a hydrocyclone processor are presented. Oil was used, part of which was processed at ELOU, and the other at the oil treatment unit (UPN). The hydrogen sulfide content in them was 132.3 and 365.5 ppm, respectively. The cleaning efficiency was estimated as a decrease in the content of hydrogen sulfide before and after hydrocyclone relative to the initial one. For oil prepared at ELOU, subsequent hydrocyclone at temperatures of 40 and 60 ºС provides the efficiency of its removal of 56.5 and 61.9 %, respectively. For oil treated at the UPN unit, when it is refined in the field of centrifugal forces at temperatures of 50 and 60 ºС, a greater efficiency of its removal is achieved — 63.3 and 69.4%, respectively. Hydrocyclone of the oil prepared at the UPN in the selected technological mode did not allow reducing the content of hydrogen sulfide in it to the requirements of GOST 51858. Alternatively, it is possible to purify such oil in two stages: first, hydrocyclone, and then treatment with an non regenerable reagent-neutralizer, for example, “Darsan-N”. At the same time, due to the removal of a significant part of the hydrogen sulfide in the first stage, the reagent consumption is more than halved compared to the treatment of the original oil. All samples of oil refined in a centrifugal force field comply with GOST requirements for saturated vapor pressure. Hydrocyclone was carried out at 40-60 ºС, which is 100-120 degrees higher than the boiling point of hydrogen sulfide. At the same time, its residual content in oil exceeded the requirements of the standard up to two times. The most probable cause of this phenomenon is apparently associated with the formation of donor-acceptor complexes of hydrogen sulfide with oil components. Therefore, the option of purification from hydrogen sulfide with the sequential use of two different technological methods seems logical.

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