STUDY OF STRUCTURE AND PHYSICAL AND CHEMICAL PROPERTIES OXIDIZED RESIN ACIDS DEPENDING ON FROM THE CONDITIONS OF THE PROCESS OF THERMAL OXIDATION OF ROSIN

UDC 676.262.014

  • Chernysheva Tamara Vladimirovna – Senior Researcher, the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: chernysheva@belstu.by

  • Chernaya Natal’ya Viktorovna – DSc (Engineering), Professor, Professor of the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova Str., 220006, Minsk, Republic of Belarus). E-mail: chornaya@belstu.by

  • Gordeiko Svetlana Aleksandrovna – PhD (Engineering), Senior Lecturer, the Department of Physical, Colloid and Analytical Chemistry. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: sveta_gordeiko@mail.ru

  • Karpova Svetlana Valerievna – Assistant Lecturer, the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: aspirantura.bgtu@tut.by

  • Misyurov Oleg Aleksandrovich – PhD student, the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: omisurov@mail.ru

  • Dashkevich Svetlana Arkadyevna – Trainee Junior Researcher, the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: dashkevich@belstu.by

DOI: https://doi.org/10.52065/2520-2669-2021-241-1-163–171

Keywords: rosin, resin acids, thermal oxidation, structure, dynamics, spectroscopy.

For citation: Chernysheva Т. V., Chernaya N. V., Gordeiko S. A., Karpovа S. V., Misyurov O. A., Dashkevich S. A. Study of structure and physical and chemical properties oxidized resin acids depending on from the conditions of the process of thermal oxidation of rosin. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2021, no. 1 (241), pp. 163–171 (In Russian). DOI: https://doi.org/10.52065/2520-2669-2021-241-1-163–171.

Abstract

Resin acids in the process of modification and neutralization of rosin additionally undergo partial thermal-oxidative degradation, which affects their structure and physical and chemical properties. These processes are enhanced in the presence of air oxygen and cations of metals of variable valence (cobalt Co2+, iron Fe2+, nickel Ni2+, manganese Mn2+, and chromium Cr3+). The latter can spontaneously pass into the reaction mixture from the walls of equipment made of alloy steel. This is facilitated by a temperature of 150–250°C and the duration of the modification processes, as well as the presence of "traces" of moisture. The lack of information in the modern literature on the effect of the ongoing process of thermo-oxidative degradation on the structure and physical and chemical properties of resin acids can not improve the efficiency of modification and neutralization processes, which makes it necessary to conduct research in this direction, the results of which are of scientific and practical interest.

A method has been developed for determining the degree of thermal-oxidative degradation of rosin resin acids depending on the conditions of the thermal oxidation process. It was found that thermal oxidation in the presence of air oxygen and "traces" of moisture leads to the appearance of oxidized resin acids mainly (60–70%) of a low degree of oxidation. These acids contain one or more hydroxyl groups and are oxyacids, which leads to a decrease in the acid and iodine numbers by 9.2 mg KOH/g and 5.8 g J2/100, respectively, and an increase in the softening temperature of rosin by 5.9°C. Additional introduction of metal cations of variable valence into the reaction mixture leads to the formation of oxidized resin acids of a higher degree of oxidation in predominant amounts (55–60%). These acids are more unsaturated and contain one or more ketone groups.

The dynamics of accumulation of oxidized rosin substances depending on the nature of the metal cation of variable valence is determined. It was found that the highest rate of accumulation of oxidized substances is observed in the presence of Co2+ cations, and the lowest – in the presence of Cr3+cations.

It was found that the process of thermal oxidation, which occurs at a temperature of 220°C for
5 hours, increases in the presence of metal cations of variable valence, which leads to a deterioration of the physical and chemical properties of rosin. This is evidenced by a decrease in the acid number of rosin by 20.7 mg KOH/g, an increase in its iodine number by 20.0 g J2/100, an increase in the softening temperature of 7.4°C and a deterioration in color by 7–8 color standards.

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10.11.2020