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1.

Sytnik N. 
Rational conditions of fatty acids obtaining by soapstock treatment with sulfuric acid [Електронний ресурс] / N. Sytnik, E. Kunitsia, V. Mazaeva, V. Kalyna, A. Chernukha, S. Vazhynskyi, O. Yashchenko, M. Maliarov, O. Bogatov, B. Bolibrukh // Eastern-european journal of enterprise technologies. - 2021. - № 4(6). - С. 6-13. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2021_4(6)__3
As a result of alkaline neutralization of oils, a significant amount of soapstock is formed, the utilization of which creates an environmental and economic problem. The production of fatty acids from soapstock using sulfuric acid decomposition is investigated in this work. The peculiarity of the work is the determination of regression dependences of the yield and neutralization number of fatty acids on the soapstock processing conditions: temperature and duration. Soapstock obtained after neutralization of sunflower oil was used as raw material. Soapstock indicators: mass fraction of moisture - 15,4 %, total fat - 71,9 %, fatty acids - 64,5 %, neutral fat - 7,4 %. Rational conditions of soapstock processing are determined: temperature (90 - 95) <^>oС, duration 40 min. Under these conditions, the fatty acid yield is 79,0 %, the neutralization number is 180,0 mg KOH/g. Quality indicators of the obtained fatty acids: mass fraction of moisture and volatile substances - 1,8 %, mass fraction of total fat - 97,0 %, cleavage depth - 64,5 % of oleic acid, the presence of mineral acids - no. Fatty acids correspond to fatty acids of the first grade according to DSTU 4860 (CAS 61788-66-7). An increase in the temperature and duration of soapstock contact with sulfuric acid increases the yield and neutralization number of fatty acids. This is due to a decrease in the viscosity of the reaction medium, an increase in the depth of cleavage of soapstock soaps with sulfuric acid, an increase in the intensity and duration of mass transfer. The developed rational conditions allow obtaining fatty acids from soapstock, which correspond in composition to fatty acids from refined deodorized sunflower oil. The results allow solving a number of economic and environmental problems associated with soapstock utilization and can be implemented in oil refineries and fatty acid production.
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2.

Bolibrukh B. 
Monitoring and management ion concentrations in the air of industrial and public premises [Електронний ресурс] / B. Bolibrukh, V. Glyva, N. Kasatkina, L. Levchenko, O. Tykhenko, O. Panova, O. Bogatov, T. Petrunok, I. Aznaurian, S. Zozulya // Eastern-European journal of enterprise technologies. - 2022. - № 1(10). - С. 24-30. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2022_1(10)__5
This paper reports a substantiated method and a designed device for controlling the concentrations of air ions in premises in accordance with the European standards SBM 2015. The use of an ultrasonic humidifier with a capacity of 25 W for two hours increases the concentration of negative ions around the device from 240 to 560 cm<^>-3, positive ones - from 260 to 410 cm<^>-3. The intensity of the electrostatic field of a polymeric coating decreases from 5,1 to 0,2 kV/m. The disadvantage of the humidifier is a small radius of influence (1,0 - 1,5 m) and the inability to control the polarity of ions. It has been experimentally established that air cooling systems (split systems) deionize the air of the premises. Degrees of deionization and dominating polarity are unpredictable and different for devices of different manufacturers and brands. To control the ion composition of the air simultaneously with the maintenance of normative relative humidity and stresses of static fields, the structure was proposed and the effectiveness of a bipolar ultrasonic air ionizer with adjusted performance and dominating polarity has been tested. The maximum productivity of the ionizer is 4,000 - 5,000 cm<^>-3. The radius of exposure is 5 m (reducing the concentration of ions with a distance to 500 cm<^>-3). To pass the ionized air through an air capacitor, the number and predominant polarity of air ions are regulated by the polarity and voltage on the covers of the capacitor. It was established that in order to service a room with an area of 50 m<^>2, an ultrasonic emitter with a capacity of 25 W would suffice. The adjustability of the device performance makes it possible to reduce or increase the service area. The ability to purify air from suspended particles is shown. During the two hours of operation of the ionizer, the dust content decreased from 4,3 - 4,4 mg/m<^>3 to 1,4 - 1,6 mg/m<^>3.
Попередній перегляд:   Завантажити - 395.968 Kb    Зміст випуску    Реферативна БД     Цитування
3.

Bolibrukh B. 
Determining patterns of the influence of low temperatures of the external environment on head protection for a mountain rescuer [Електронний ресурс] / B. Bolibrukh, O. Tokarskiy, О. Kovalenko, S. Stasevych, O. Tykhenko // Eastern-European journal of enterprise technologies. - 2022. - № 5(10). - С. 39-48. - Режим доступу: http://nbuv.gov.ua/UJRN/Vejpte_2022_5(10)__7
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Відділ наукової організації електронних інформаційних ресурсів
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