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Документ Identification of the oxidation and hydrolysis products content influence on the rapeseed oil oxidation induction period(Technology center PC, 2024) Stankevych, Serhii; Gorbunov, Kostiantyn; Zabrodina, Inna; Popov, Mykola; Kalyna, Viktoriia; Novozhylova, Tetiana; Falalieieva, Tetiana; Ovsiannikova, Tetiana; Ponomarova, Maryna; Zolotarov, AndriiThe object of the study is the dependence of the induction period of rapeseed oil on the content of oxidation and hydrolysis products. A feature of the work is determining the approximation dependence of the induction period of accelerated oxidation of refined rapeseed oil on the content of primary oxidation products and free fatty acids. This is useful when predicting the shelf life of refined rapeseed oil. It was determined that both factors negatively affect the oxidation stability of refined rapeseed oil. An increase in the peroxide value decreases the induction period of model oil samples by 32.8512 units for each additional mmol ½ O/kg. In turn, increasing the acid value of oil samples reduces the induction period by 19.8424 units for each additional mg KOH/g. Different oxidation dynamics of model samples of refined rapeseed oil with tocopherol were revealed, depending on the concentration of primary oxidation and hydrolysis products. The obtained data are explained by the fact that the primary lipid oxidation products are unstable and quickly decompose to form free radicals. These radicals initiate further lipid oxidation, resulting in reduced oil quality. In addition, free fatty acids are more reactive than triglycerides and are more easily oxidized. A feature of the obtained results is the possibility of modeling processes that affect the oxidation stability of refined rapeseed oil. From a practical point of view, the research results allow initiating measures to maintain the safety of oil-containing food products based on refined rapeseed oil. An applied aspect of using the scientific results is the possibility of rationalizing the storage conditions of refined rapeseed oil to maximize its shelf life and increase competitiveness.Документ Sustainability Improvement of Kazakh Chemical Industry via Process Integration: A Case Study of Calcium Chloride Production(The Italian Association of Chemical Engineering, 2019) Boldyryev, Stanislav; Khussanov, Alisher; Gorbunov, Kostiantyn; Gorbunova, OlhaThis work presents the analysis of the calcium chloride concentration unit to reduce energy consumption and harmful emissions. The concentration of the calcium chloride in the raw materials is 14 % (mass) and a concentrated solution has 35 % of CaCl₂. Process Integration techniques were used for the analysis of the existing process to identify bottlenecks and disadvantages. A Pinch approach was executed to get real energy targets, energy gap and possible ways for process update. The authors proposed the solution for the process improvement using traced Grid Diagram and detailed simulation of the parameters of heat exchangers and evaporation units to get a feasible and economically beneficial retrofit. The representative case study of a Kazakh chemical factory was presented. There are some barriers to the development of the profitable and feasible solution, e.g. process constraints and limited performance of existing equipment. It forces developing a local methodology to apply the case study in an appropriate and most profitable way. The energy consumption of the inspected unit is 25 % higher than the target value. Nevertheless, the 1st feasible retrofit case with a detailed simulation of heat exchanger network parameters has only 17 % less energy consumption but, at the same time, the improved operating conditions of the evaporation unit were achieved. The 2nd retrofit option reduces the energy consumption by 22 % and more complicated network with additional operation changes was proposed. The results of this work may be used for the energy saving retrofit of the industrial evaporation units and decreasing the environmental impact of the chemical industry in Kazakhstan.