Sedimentation of bentonite suspensions under the influence of low molecular weight polymers based on amino ester salts

Dmitriy Yu. Vandyshev; Olga V. Sleptsova; Vladislav Yu. Gazin; Stanislav A. Malyutin; Naum R. Malkin; Khidmet S. Shikhaliev

doi:10.17308/kcmf.2023.25/11391

Dmitriy Yu. Vandyshev Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation https://orcid.org/0000-0001-8606-458X
Olga V. Sleptsova Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation https://orcid.org/0009-0006-7467-275X
Vladislav Yu. Gazin Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation https://orcid.org/0009-0009-4000-6638
Stanislav A. Malyutin JSC Petrochem, 14, Rabochaya st., Belgorod 308017, Russian Federation https://orcid.org/0009-0006-0572-8545
Naum R. Malkin JSC Petrochem, 14, Rabochaya st., Belgorod 308017, Russian Federation https://orcid.org/0009-0006-9744-3044
Khidmet S. Shikhaliev Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation https://orcid.org/0000-0002-6576-0305

DOI: https://doi.org/10.17308/kcmf.2023.25/11391

Keywords: Flocculation, Coagulation, Amino esters, Sedimentation rate, Rheological properties, Bentonite, Drilling fluid

Abstract

Among the available technologies for treating natural and wastewater from clay materials, coagulation/flocculation is the most common method due to its high efficiency, simplicity, and cost-effectiveness. Inorganic coagulants such as aluminum sulfate and ferric chloride, widely used as destabilizing agents for colloidal particles, have several significant drawbacks: low efficiency and toxicity. Organic reagents of both natural and synthetic origin are a good alternative.
This work is devoted to the evaluation of the flocculation action of new reagents, which are low molecular weight polymers based on amino ester salts on clay suspensions, as well as the selection of their optimal concentration, providing the maximum sedimentation rate.
Studies have shown that amino ester salts can be effectively used for the treatment of water-clay suspensions. An important factor is the nature of the anion used, which has a significant influence on the oagulation ability of esters. Thus, 40–50 % (wt.) aqueous solutions of amino ester chlorides added to clay suspensions in an amount not exceeding 0.1% (vol.) can be used to thicken clay suspensions. At the same time, aqueous solutions of amino ester bromides regardless of the concentration, introduced into bentonite suspensions of 0.1–0.4 % (vol.), contribute to improved sedimentation, reducing viscosity, and increasing filtration capacity. These results allow us to recommend the use of amino ester chlorides as a
thickener in the preparation of drilling muds for strengthening the walls of wells during drilling, and bromides – for flocculation of bentonite suspensions in oil production

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Author Biographies

Dmitriy Yu. Vandyshev, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Cand. Sci. (Chem.), Associate Professor of the Department of Organic Chemistry, Voronezh State University (Voronezh, Russian Federation)

Olga V. Sleptsova, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Cand. Sci. (Chem.), Associate Professor of the Department of High Molecular Compounds and Colloidal Chemistry, Voronezh State University (Voronezh, Russian Federation)

Vladislav Yu. Gazin, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Master’s student of the 2nd year of the Department of Organic Chemistry, Voronezh State University (Voronezh, Russian Federation)

Stanislav A. Malyutin, JSC Petrochem, 14, Rabochaya st., Belgorod 308017, Russian Federation

Cand. Sci. (Tech.), General Director of JSC Petrochem (Belgorod, Russian Federation)

Naum R. Malkin, JSC Petrochem, 14, Rabochaya st., Belgorod 308017, Russian Federation

Chief Technologist of JSC Petrochem (Belgorod, Russian Federation)

Khidmet S. Shikhaliev, Voronezh State University, 1 Universitetskaya pl., Voronezh 394018, Russian Federation

Dr. Sci. (Chem.), Professor, Head of the Department of Organic Chemistry, Voronezh State University (Voronezh, Russian Federation)

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