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Study of the Efficiency of Combined Titanium Coagulants in the Treatment of Formation Waters

  • Selected articles originally published in Russian in Rossiiskii Khimicheskii Zhurnal (Russian Chemistry Journal)
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Abstract

The pretreatment of model and real formation waters before the subsequent desalination was investigated. Produced water associated with the oil production process was used as a real formation water. The real and model formation waters were characterized by high salt (up to 30 g/L) and oil contents (up to 50 mg/L) and a pH range of 7.6–7.8. Treatment was carried out using aqueous solutions of aluminum sulfate (Al2(SO4)3) and titanium tetrachloride (TiCl4), thiosulfate (TiOSO4), and trichloride (TiCl3), as well as their combinations. The efficiency of treatment with different coagulant samples was evaluated, and the effective doses of reagents were selected. The feasibility of electrocoagulation on aluminum and titanium electrodes for the pretreatment of formation water was explored. The efficiency of removal of oil products and suspended solids with titanium tetrachloride solutions was 95% and with the aluminum–titanium coagulant, 90%. The efficiency of removal of oil products by the electrocoagulation on both titanium and aluminum electrodes was not higher than 76%. The effect of doping of titanium-containing precursors to a classical coagulant (aluminum sulfate) on such parameters as the efficiency of removal of oil products, suspended solids, and color, as well as the rate of filtration of coagulation sludge. The effective ratios of aluminum sulfate and titanium additives were determined, which allow the filtration rate and the efficiency of pretreatment of formation to be increased with only slight increase of the cost of the combined reagent.

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Funding

This work was supported by the Program of Support for Young Scientists and Teachers of the Mendeleev Russian University of Chemical Technology (project no. Z-2020-013).

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Authors and Affiliations

  1. Mendeleev Russian University of Chemical Technology, 125047, Moscow, Russia

    S. V. Azopkov, E. N. Kuzin & N. E. Kruchinina

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  1. S. V. Azopkov
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  2. E. N. Kuzin
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  3. N. E. Kruchinina
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Correspondence to S. V. Azopkov.

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Azopkov, S.V., Kuzin, E.N. & Kruchinina, N.E. Study of the Efficiency of Combined Titanium Coagulants in the Treatment of Formation Waters. Russ J Gen Chem 90, 1811–1816 (2020). https://doi.org/10.1134/S1070363220090364

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