The subject of this paper is hydrogen sulfide stripping technology in presence of industrial oxygen and catalyst complex, as well as its implementation in laboratory conditions. The purpose of the work is to bring the quality of marketable oil in terms of residue H2S content up to requirements of Type 1 GOST R 51858-2002 standard. Currently there are two technologies capable to reduce H2S content in oil to 20 mil-1 or less. Drawback of hydrogen sulfide stripping technology using chemicals is high operational costs required to procure chemical scavengers. Hydrogen sulfide stripping method by oxidation using oxygen from air (DMS-1MA) characterized by high capital expenditures (need for high pressure in the system to carry out reaction in separate reactor with associated gas removal equipment) and significant volume of waste CO2 with high nitrogen content which limits the possibility of its common usage in processing facilities for hydrogen sulfide containing oil. To practically evaluate H2S neutralization technology by oxygen oxidation which requires significantly lower capital expenditures, laboratory and pilot test were performed on-site. Optimal operation modes were reached which resulted in reduction of H2S content lower than 20 mil-1. According to laboratory and field data, on the corrosion resistance scale for steel 20 according to GOST 1050-2013 standard, the obtained mixture of oil, oxygen and catalyst complex is rated at 6 points – reduced resistance to this corrosive environment. Considering that maximum corrosion occurs in the initial section of pipeline where industrial oxygen being introduced in doses, it is necessary to provide corrosion protection.
Addressing the issue of fire-explosion safety of the technology, several recommendations for industrial oxygen introduction to oil stream were provided.
References
1. Sakhabutdinov R.Z., Shatalov A.N., Garifullin R.M. et al., Technologies of an oil cleaning from hydrogen sulphide (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2008, no. 7, pp. 82-85.
2. Solovev V.V., Shatalov A.N., Garifullin R.M. et al., Razrabotka i issledovanie variantov kataliticheskoy ochistki nefti ot serovodoroda na primere ob»ektov podgotovki sverkhvyazkoy nefti (Development and research of options for catalytic purification of oil from hydrogen sulfide using the example of ultra-viscous oil treatment facilities), Proceedings of TatNIPIneft / Tatneft’, 2022, V. 90, pp. 244-249.
3. Kornetova O.M. et al., Liquid-phase oxidation of hydrogen sulfide in oil with molecular oxygen in the presence of an ammonia solution of cobalt phthalocyanine
(In Russ.), Zhurnal prikladnoy khimii = Russian Journal of Applied Chemistry, 2020, V. 93, no. 9, pp. 1363-1368, DOI: https://doi.org/10.31857/S0044461820090145
4. Patent RU 2783439 C1, Set for purifying petroleum from hydrogen sulphide and low molecular weight mercaptans, Inventors: Shatalov A.N., Solov’ev V.V.,
Garifullin R.M.
