Formation and use of anaerobic consortia for the biotransformation of sulfur-containing extracts from pre-oxidized crude oil and oil fractions

Nanocatalysts for Oxidative Desulfurization of Liquid Fuel: Modern Solutions and the Perspectives of Application in Hybrid Chemical-Biocatalytic Processes

“…Development of NCs in the form of nanocomposites allows increasing the oxidative activity of the reagents, enhancing the desulfurization efficiency, and extending the application range for H 2 O 2 in ODS (Tables 1 and 2). Additionally, subjecting the resulting sulfur-containing extracts with residual hydrocarbon content to resource-saving biocatalytic technologies allows minimizing the losses of hydrocarbon backbone during ODS, reducing the quantity of waste, and enhancing the overall environmental friendliness of the desulfurization technology [24,[45][46][47]. Modern NCs for ODS generally belong to metal oxides or metal-containing heteropolymeric compounds designated as polyoxometalates (POMs), or, more seldom, to other chemical compound types (molybdenum disulfide, etc.)…”

“…After the extraction the extractant can be regenerated via distillation. A wide range of substances can be used as extractants for removal of sulfur-containing compounds: acetonitrile (AN), N-methylpyrrolidone (N-MP), N,N-dimethylformamide (DMFA), ethyl acetate, ethylene glycol, γ-butyrolactone, 2-ethoxyethanol, ethylene glycol dimethyl ether, acetone, pyrrolidone, diglyme (diethylene glycol dimethyl ether), methanol, ethanol, isopropanol, as well as water and other substances [24,76,86,93]. Among this variety of extractants, only several allow achieving desulfurization levels above 90% for various model systems and real petroleum fractions due to the extraction of the oxidized forms of sulfur-containing compounds, while being available enough to be considered perspective.…”

“…Therefore, it is expected that the losses of valuable hydrocarbons shall decrease in the following of series of nitrogen-containing extractants: AN, DMFA, and N-MP. It appears that in the course of a multi-stage process the sufficiently high degree of desulfurization of the raw materials can also be achieved with alcohols such as methanol, ethanol, and isopropanol [24,76,96].…”

“…For example, a deeper desulfurization of fuel after ODS (chemical oxidation and extraction) can be performed via oxidative 4S-pathway in the presence of microbial BCs. Moreover, the sulfur-containing extracts with residual hydrocarbons can be converted under the action of microbial BCs into biogas rich in such valuable components for C-1 chemistry as CH4, CO2, and H2 [24]. Other pathways for biotransformation of sulfones are also known, such as destructive way or methanogenesis.…”

Book of Abstracts Sixth International Conference of the CIS IHSS on humic innovative technologies "Humic substances and ecoadaptive technologies" (HIT-2021)

“…Anaerobic methanogenic consortia are widely used not only for the production of biogas, but also for the decomposition of various wastes and for wastewater treatment. In this work, we used HS for stimulating metabolic activity of anaerobic cells during the biocatalytic stage of the hybrid chemical-biological process of oil desulfurization [6][7]. This process is a sequential combination of chemical stages (oxidation of sulfur-containing substances and their extraction) and a biocatalytic stage (transformation of an extract containing oxidized sulfur compounds under anaerobic conditions with simultaneous production of biogas and inorganic sulfide).…”