SouthWest State University, Kursk, Russia

S. D. Pozhidaeva, Associate Professor of the Department of Fundamental Chemistry and Chemical Technology, Candidate of Chemical Sciences, e-mail: pozhidaeva_kursk@mail.ru

A method for obtaining metal carboxylates from metals (manganese, lead, iron, tin and copper) and their oxides in a state of higher valence (Ме₂О₃, Ме₃О₄, МеО₂, CuO — for copper) in acidified organic media in the presence
of catalytic amounts of molecular iodine is proposed. The process is based on two stages, one of which involves the interaction of metal with molecular iodine, which is introduced into the charge in stoichiometric deficiency in amounts close to catalytic (1·10^–2–1·10^–4 mol/ kg), and in the second stage, the resulting product is oxidized (Ме₂О₃, Ме₃О₄, МеО₂, CuO — for copper), which in the presence of acid with the corresponding anion makes it possible to obtain carboxylate (mixtures of carboxylates) at room or near room temperatures. Under conditions of intensive mechanical mixing in a bit mill with an agitator rotation speed of at least 1440 rpm, iodine as a by-product of the second stage re-interacts with the source metal, ensuring the flow of the first stage and realizing a macrocycle, which, under favorable flow conditions, ends with the quantitative consumption of the loaded feedstock. Unlike known analogues, the proposed option can be implemented in one technological stage in an acceptable time, in one reaction apparatus, unified for different raw materials (manganese, lead, iron, copper, tin and their corresponding oxides in a state of higher valence) and is easy to control. The use of organic liquid media ensures the absence of wastewater and the need to purify the resulting salts from hydrolysis products. The possibility of using industrial metal waste (chips, wire) characterizes the proposed method as universal and low-waste. The kinetics studied in a wide range of conditions (by the nature of the metal, oxide, acid, solvent, concentration factor for each component of the loading, the nature of additives, mixing method and reactor type) showed that, despite the general scheme of the gross process, the details of the mechanisms and dynamics of changes in time of the process characteristics (speed, yield of a particular product and selectivity), the phase state of the components of the reaction mixture and the dynamics of their changes during the process, the nature of the target product, etc. are individual in each case and require study and careful consideration when developing an appropriate method for obtaining carboxylate.

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